Veeam xfs block size. 8x. Enable inline data deduplication is "off". 00 %. Veeam customers leveraging synthetic full backups only backup changed data. You can use the configuration choices in this article and apply them to your hardware. For XFS follow the veeam docs and do 4KB Feb 22, 2023 · In case of object storage a higher block size means that all random IO based restores including instant VM recovery, file level recovery and application restores will need to read much more data than needed from the object storage and therefore processing is slower. Result : I have done several tests with several kinds of contents and it is each time more or less the same result. With the veeam Agent I am sure to avoid this kind of problem. First, this document is incorrect as with the default settings, the size of blocks Veeam writes varies and equals to whatever each 1MB of source data compresses to. Oct 15, 2023 · Setup : The setup of the Veeam Cloud Connect is a infrastructure that consists of several SOBR’s that consists of multiple extents (performant block-storage physical servers with REFS - 64K) in a performance tier in 1 datacenter and a capacity tier with object storage (performant physical object storage devices) in another datacenter with using the copy-mode and immutability. So in my case. Have a Linux VM consuming local storage on Synology, format it with XFS and enjoy block cloning and immutability. Apr 16, 2020 · Solution. Sep 28, 2017 · In the above case, the reason was in the block size limitation in the controller. Dec 15, 2023 · Below shows a list of Veeam-supported Linux distributions: Linux OS Requirements. 选择数据加固时间，Make recent backups immutable for N days. Mind you that I am doing this with a virtual machine There is no problem, the inflation to full size is both expected and by design. a RAID volume), Linux exposes information about that layout so that XFS can optimize the layout of that metadata to match the parameters used in the creation of the RAID and thus maximize the performance. Perhaps 512KB referenced above is just an average. Utilize Veeam's Best Practice Guide on how to calculate Repository hardware sizing. File system is XFS. And because Veeam Backup&Replication uses this feature massively, I use this backup solution as an example here. When I copied files to the XFS repository, it's ready for block cloning. Larger block sizes are faster to process as there’s less of them to track, but if 1KB of a block has changed but you’re fetching 4MB blocks, you’re backing up nearly 4MB of unchanged data alongside this, so incremental Dec 16, 2022 · VeeaMover is a cool new feature available in the next Veeam Backup & Replication v12 that allows to move or copy backups to different locations. May 2, 2022 · SOBR is a logical construct allowing a backup administrator to group storage extents together to form a multi-tier storage "pool" to ease the management of backups. Veeam Backup & Replication v10でLinux XFSサポートを利用すると以下の2つの効果が得られます。. I was asked, if a hardened repository can be a extent of a Scale Out Repository (SOBR). Encryption works at the source side. Mar 17, 2018 · If you add this Storage directly as a NFS Backup Repo to the VBR Server, Fast Clone will no be used. It allows for 26 3. However, specific Object Storage providers may have different recommendations, in many cases 4MB is recommended to reduce the number of API calls. This quite literally means that GFS backups are "free" to create, because they take no physical disk space. In the inventory pane, select Backup Repositories. Jan 13, 2015 · 3) XFS block cloning works fine. Jun 3, 2022 · Block Size: Veeam offers optimisations for tweaking the block size it fetches as part of changed block tracking (CBT). by tsightler » Tue Sep 28, 2021 5:35 pm 1 person likes this post. Use xfs_freeze in your pre-snapshot creation hook and xfs_freeze -u in the post-snapshot creation hook Apr 28, 2022 · Introduction. Jan 7, 2021 · When you create a synthentic full backup, the backup job will use data blocks from existing backup files and changed/new blocks from the current job run to synthesize a new full backup file. However, this value has nothing to deal with the file system block size, which is largely irrelevant and has virtually no impact While XFS itself does support block sizes up to 64KB, reflinking requires that the block size does not exceed the memory page size that the Linux kernel was compiled with (default is 4KB), otherwise man mkfs. ITP-Stan. Example 2. Veeam Backup & Replication reads VM or file data, encodes data blocks, transfers them to the target side in the encrypted format and stores the data to a file in the backup repository or archives the data to tape. Test 1 & 2 were basically the same. It might happen when a snapshot portion is not aligned with COW-block, which means that the portion capacity cannot be fully utilized. Ok, let’s switch to the next important program component — Veeam Backup Repository. Jan 11, 2021 · Extending a Veeam Repository XFS File System Since diving into the Veeam Backup & Replication v11 Linux hardened repository I have started to use XFS in bite-size deployments to gain experience with it. su = 256k (Smart Array Controller stripe size) sw = 24 (number of data disks) This is working but it prints out a warning: mkfs. reflink=1 enables reflinking for the XFS Oct 30, 2020 · Because of the new v11-feature of immutable backups on XFS filesystem, I am looking for real-world experiences with XFS as Repository. If you have a small environment, don’t worry. And since it’s multiplied by 100 that’s a percentage, not the raw ratio between the two values. It matters from a performance perspective if you are performing synthetic file operations (which you should be if opting for an REFS or XFS formatted repository) and also you will likely run into memory issues with the 4kb block size. One of my go-to Veeam backup target storage solutions is the DELL R740XD2. Use the format with /L option for larger file records. But again, remember to carefully evaluate these configurations options when you design a new Feb 27, 2023 · Like any filesystem, XFS has metadata and, when laying out that metadata on a block device that is made of multiple components (i. The xfs_info command knows more about the file system. Advanced Settings’ Storage tab. The backup size is likely to be the same, so that 8% overhead just became 16%! Jul 29, 2019 · Click “Install”. Dec 11, 2019 · But when I look in Veeam that extent is showing used space of 260GB, not apparently the reduced size due to the block cloning. While it's amazingly fast and allows you to size overall smaller servers, I believe it's plain as day that it's very much so an "all eggs in one basket" situation. 1. xfs -b size=4096 -m reflink=1,crc=1 /dev/XXX Assuming the above is okay, in Veeam, I would go into my job, Storage, Advanced, then under the Backup tab, I check create synthetic full and uncheck Feb 17, 2015 · If we use the same I/O profile, with 512KB for both the stripe size and the Veeam block size, in an 8-disks storage array we have: Raid5: bandwidth (MiB/s) 60,76. veeambp. I checked it with linux commands. Then veeam support said what we need to move all incremental backups too. If the new storage is not the same size you can still do the copy and then Jun 2, 2023 · Example 1. Oct 21, 2020 · Veeam Backup & Replication v10では、このreflinkという機能を効率的に利用することができます。. Mar 11, 2020 · Unless something has changed very recently the XFS on-disk format itself supports block sizes up to 64K, but there is a huge caveat, the actual XFS implementation on Linux limits the maximum supported block size = kernel page size (documented in the mkfs. All calculation results are estimate and may differ from real-life usage scenario. Snapshots of the zvol won' t necessarily result in a consistent XFS filesystem. The Performance Tier holds the "operational restore window" parts of the backups on-premises, typically on block or file-based storage, while both the Capacity and Archive Tiers Experience shows that the default Optimal compression setting with the 1MB block size is the best choice for most environments. 确认推送安装包. - Update 2024-01: XFS works fine 4) even with dsmISI and active full, be prepared for issues. VBAZ supports hot, cool, and archive storage tiers. You're probably confusing it with ReFS, which does offer one (but we don't recommend enabling it). Test 3 & 4 were faster the larger strip/stripe you had. But even if you don't need GFS backups, there may still be the need Jun 23, 2021 · 选择新挂载的目录，点击next. 10x, so this seems to reinforce @Ptide's and Mr. (See block size in the dd command, "man dd"). But I gotta ask - Why REFS? Most of the talk track now days is around immutable backups - So for Veeam that means Hardened Linux Repos with XFS for the Fast Clone/Block clone (like REFS). I just read throug Sep 27, 2021 · Re: Copying backups from one XFS Fast Clone repository to another. 等待信息刷新. You do NOT want to be in a situation where you have to re-write the entire XFS filesystem. sh. For other distributions, Fast Clone support is experimental. Hardened repositories can be Performance Tiers of SOBR. 5 and enter the backup server name or IP address, backup service port number, and the user log in credentials. ReFS/XFS Block Cloning = enabled Incremental backup = 10 hours 3 years of 10% data growth All Veeam infrastructure sizing was done using the Veeam Size Estimation Tool on www. To enable the Fast Clone option on Veeam Backup & Replication for Nutanix Mine, do the following: In the Veeam Backup & Replication console, open the Backup Infrastructure view. The default value is 4096 bytes (4 KiB), the minimum is 512, and the maximum is 65536 (64 KiB). Jan 25, 2023 · So we make this partition 25GB in size. 5″ HDDs which gives you a choice of 8TB, 12TB, 14T, and 16TB for size. Start Veeam BR 9. Sightler's perspectives on Tumbleweed. The first new capability here is related to “Block cloning” technology, which got somewhat popular after the release of Windows Server 2016 and ReFS 3. This block size relates to the size of the blocks that Veeam is reading at a time from your VM. Block size is Local target (large blocks). - Without FastClone, we have to copy all data blocks and create a new file. XFS - a small real world synthetic performance comparison of Veeam Backup & Replication Mar 27, 2013 · This block size, formerly called "Local target (large blocks)," will help improve performance when storing backup files on deduplication storage as it reduces the size of the backup file's internal metadata table. 17 posts • Page 1 of 1. Oct 15, 2023 · OK, fine : then we set the block size of the primary backup-job to 4MB instead of the recommended (by Veeam) 1MB block size and run an active full so the 4MB block size is active on the primary repository. root@lnxrepo:/backup# . Jul 26, 2018 · Linux distribution has the reflink kernel module. The xfs bsize might be tunable, the device block size will remain. So, you will want to stick with 4KB blocks, as per the Veeam documentation. I just read throug RAID stripe size on the other hand directly impacts IOPS, which is especially big deal for usually slow backup storage. With Veeam native data reduction plus XFS space saving (block cloning), that can be up to 100 PB logical data in one rack with a backup speed up to 420 TiB/h. 8xHDDs R10 512K/2M ReFS 64K vs 128k/512K ReFS 64K. Sep 20, 2021 · JMeixner wrote: Mildur wrote: You need todo a volume level restore. We don’t need XFS block cloning features for the operating system partitions. The minimum supported data block size is 1 KB. 勾选Use fast clone on XFS volumes，使用Fast Clone技术. by nitramd » Tue Dec 29, 2020 3:44 pm. This results in the smallest size of backup files, allowing you to reduce the amount of traffic over WAN. It takes 8 days and didn't help. Per the Veeam Backup & Replication User Guide: If you connect the tape devices via HBA, Veeam Backup & Replication uses the block size configured for the HBA. Geoff Burke. Where can I see in Veeam these savings and report on them? Oct 31, 2023 · For this reason, if you were to ever move data from a REFS volume to another REFS volume or an XFS volume (same sort of idea as REFS, but on linux machines), it is recommended to use the VeeaMover feature within Veeam as this is block cloning aware and will move the data without re-expanding it to its original size. May 30, 2023 · Scale=2 is to tell bc that we want to round the result to the second decimal value. （演示内容因磁盘格式化为ext4格式，因此不选择use fast cloning选项，如新增空间为XFS可以继续选择使用该功能）. Use the Veeam Size Estimator (VSE) or Veeam Capacity Calculator to estimate capacity requirements. Mar 5, 2024 · Making adjustments in Veeam to the number of concurrent operations with the task slot setting, increasing the object size by increasing the backup job block size, reducing the number of objects in the multi-object delete requests, and choosing the maximum time window for the jobs to complete will optimize the solution for performance and cost. Aug 25, 2021 · Within a Veeam Backup & Replication job, under the “ Storage > Advanced > Storage ” section, you can define a data block size from the “ Storage Optimization ” section. Please check with the Object Storage vendor for their recommendations. Oct 6, 2020 · powershell ReFS Veeam. Only XFS and ReFS do. The default setting seems to be better, but for whatever reason it was changed at one of the customers I know. If you went from the default of Local target (1MB blocks), to LAN target (512K blocks), suddenly that's 20,000 blocks and, since the alignment overhead is per-block, that doubles my overhead with 64K clusters to 640MB. XFS reflink ratio is 54. This means that the df command will show a higher used capacity because it is including the overhead from metadata blocks. Starting from Veeam Backup & Replication version 12, to keep backups in object storage repositories, you no longer need to add this repository as a part of the scale-out backup Oct 23, 2023 · Re: NAS Synology (ISCSI or SMB network share) by GregorS » Fri Nov 03, 2023 12:58 pm. Oct 23, 2023 · This option reduces the size of an incremental backup file because of reduced data block sizes. Because of the new v11-feature of immutable backups on XFS filesystem, I am looking for real-world experiences with XFS as Repository. Jul 17, 2017 · So far XFS is working well. Jul 28, 2021 · Metadata overhead: The df command reports the total used space, including both data blocks and metadata blocks, whereas xfs_bmap only reports on data blocks. If you mount this „other system storage“ per iscsi or FC to your centos server, then you can format the LUN with xfs. Includes Enterprise Plus Edition features. Click “Connect”. Test 5 improved by about 4% to 5% with each increase in strip/stripe size. Filesystem is XFS. Its explained quite well in this article Jun 6, 2018 · We use ReFS, and the block size was set to 4K, which is the default, while the recommended block size is 64K. this post. Jan 28, 2020 · XFS block cloning support. For Veeam backups specifically, we recommend 128KB or 256KB RAID stripe size (whereas most common default setting is 64KB). Obviously, there’s a tradeoff in terms of disk space. e. If you need to change the target repository for a Backup Job containing existing backups, a warning message is displayed and the procedure cannot be finalized until the backups have moved to the new May 17, 2018 · That is technically enough, but from the limited info I found on this it sounds like I might need to use dd and do a block level copy. Nov 8, 2016 · Also, the math changes if you change the block size. The only method to do so today is via a block level copy like DD or xfs_copy, or some other block based method, as mentioned previously. 3、新建备份策略，选择上面新建的Linux Hardened Repository。. Then it‘s possible to use FAST Clone with the help of the centos 8 backup repo. The xfs block cloning has been around for Veeam for over a year now I think, and there are some large customers doing tons of TB worth without a problem. Test 6 was a whopping 29% faster but then only marginally faster for the next strip/stripe size increase. We’ve decided to repurpose one of our large Synology boxes (RS3617xs+) and put some big drives to get us adequate storage space. My question is, if I move all the files from a repository to someplace else, format the now empty repository Sep 26, 2018 · The Linux implementation of XFS is limited to a maximum of 4K for the block size (the XFS filesystems on-disk structure technically allows larger block sizes, but the current XFS implementation on Linux limits maximum block size to the system architecture page size, which is 4K for X86/64 architectures). This works regardless of compression or encryption status. In the repository settings, it is "decompress backup file data blocks before storing". Just one thing to point out although it might be obvious, don't mix in the same scaleout XFS and REFS repositories. xfs: Specified data stripe width 12288 is not the same as the volume stripe width 6144. But this would need again all of the space of a entire full :) There are multiple cloning utilitys out The main issue with this configuration is that stripe alignment with the ZVOL block size results in a significant loss of usable space due to misalignment with small record sizes (ashift=12, recordsize=4k) or alternatively large write amplification due to read-modify-write when using large record sizes (e. The installation process will take some time. A SOBR can contain a mix of repositories: ReFS, XFS, Immutable and mutable. Mar 18, 2021 · With sw raid mkfs can detect the number of disks etc, but not for HW RAID. gstrouth. /reflink. Dec 6, 2019 · No real knowledge but an idea: The block device driver works with a block size of 512 for compatibility reason. Block cloning technology, for me at least, natively implies redundancy elsewhere. The mountpoint can be selected directly from the drop-down menu. ReFS (Resilient File System) is a file system by Microsoft that provides – since Windows Server 2016 – a feature named Block cloning. Block size: Formatting a ReFS volume at 64K is not the default (which is 4K) but is recommended for Veeam backup file sizes and the associated manipulations needed . Besides the above, there are CPU and RAM requirements. 256KB — select this option if you plan to use WAN for offsite backup. But you can increase its size. I then used ftrace on the Linux NFS server to capture the IO sizes going to the datastore. Fast Cloneは、合成フルの時のパフォーマンスが劇的にアップします。. I am planning to use it as a Veeam Backup Feb 11, 2021 · I use Veeam Agent Windows or Linux, to avoid taking snapshots on servers where the change rate is high. Consider that: size=4096 sets file system block size to 4096 bytes. Feb 15, 2017 · This was done with a test Linux VM and I used DD with random data to make sure the replica job had something to copy each time. Iit is a risk snapshot a file server monster machine risk of saturating the datasore. Then, Fastclone will be used after that. Total of like 120 vms. Feb 17, 2021 · Veeam v11 - Hardened Repository aka Immutable backups. Significantly impacting the amount of time needed to complete a merge. May 27, 2024 · An object storage repository is a repository intended for long-term data storage and based on either a cloud solution or S3 compatible on-premises storage solutions. Not file. by PTide » Thu Aug 22, 2019 5:10 pm. Apr 16, 2015 · XFS does not actually offer deduplication so don't worry about that check box. The block size is specified either as a base two logarithm value with log=, or in bytes with size=. Mar 8, 2010 · The fast cloning technology we're are able to use with ReFS/XFS volumes comes with many benefits, but the biggest one is what we call "spaceless" synthetic full backups. So choose your initial zvol size wisely. Because a synthetic full backup is synthesizing the full backup from the previous full and incremental backups, this process can result in high random input/output (I/O) activity on backup storage. Apr 20, 2015 · Veeam Community discussions and solutions for: mix ReFS & XFS extent in Scale Out repository of VMware vSphere Jan 11, 2024 · Thought I'd share another Linux process today – how to resize a Linux volume used as a Veeam Repository in Linux OS, specifically increasing its size. 5) make sure the Isilon is configured correctly. There are some special considerations when using an object storage repository regarding Because of the new v11-feature of immutable backups on XFS filesystem, I am looking for real-world experiences with XFS as Repository. Other option would be an active full. In addition to avoiding keeping the snapshot open for too long to wait for the backup to finish. I have two environments right now using it and one is source data of 30TB, one is only 5TB, but yeah working great. We will create an iSCSI LUN on said FS, XYZ TB in size, mounted to a Linux VM formatted XFS for May 18, 2023 · Veeam Community discussions and solutions for: ReFS vs. I installed Tumbleweed several months ago for testing purposes, I believe the kernel was 5. The amount of CPU cores and Memory required will depend on your environment and concurrent tasks. x, failed all backups during transfer time, that still had data on the repository marked as in maintenance, even thou the data is there and obviously readable. 选择mount server. Use ReFS/XFS with block cloning to reduce space requirements for synthetic fulls and GFS restore points and improve merge performance. cheers. ReFS/XFS/object storage) or a deduplication appliance, the smaller the block size, the more space savings are to be had. Raid10: bandwidth (MiB/s) 101,27. When the “Installation succeeded” window is displayed, click “Finish” to complete the Veeam BR installation. The immutability is the biggest reason I went with it. So addressing a certain block is independent of the file system. Both XFS and ReFS offer block cloning and so all the associated space saving technologies by Veeam. Good news: yes it can! But you have to take some facts into account. Disk partitions is less than 200 TB. 5. For the record (maybe option D, a variant of option C): you can create and run virtual machines on Synology. com VUL = Veeam Universal License VAS = Veeam Availability Suite Universal Subscription or Perpetual License. Aug 31, 2016 · The larger block size doesn’t affect performance but it can help avoid excessive fragmentation; therefore a 64KB block size is recommended. One of the things that will certainly come in handy is extending a Veeam Repository XFS File System. ashift=12 recordsize=1M) resulting Re: Snapstore portion was not ordered by Copy-on-Write block size. What I have read suggests that is only possible with same size target and destinations, which isn't something we will be able to do as the original source is bigger than the new target, though both are sufficient. We have noticed some strange performance issues when the servers are writing to disk, and the block size is the probable cause. we have moved full backup file to the XFS repository and run compact full file. I remember that there is a "streaming" and another setting. Azure Blob storage accounts are used as backup repositories. Reply. Add more resources if you plan to use health-checks as health checks require additional read IO. 勾选Make recent backups immutable for days，这是加固功能的开关. Feb 22, 2023 · Like any filesystem, XFS has metadata and, when laying out that metadata on a block device that is made of multiple components (i. Aug 29, 2023 · Veeam Backup & Replication uses the block cipher encryption algorithm. Full details of these blocks are Jun 2, 2023 · If do decide to use it make sure you remember to use the 4K block size when you format the REFS volume. Resolution steps To learn about system requirements for Veeam Agent managed by Veeam Backup & Replication, see the System Requirements section in the Veeam Agent Management Guide. Best practice. There are many reasons but different block size for one is an important one. Verification of configuration: If a storage path on a Windows Server 2016 system is not correctly using ReFS, Veeam Backup & Dec 18, 2023 · The valid block_size_options are: log=value or size=value, and only one can be supplied. Object Storage. The file system is left unchanged at ext4. Savings coming from block cloning cannot be migrated from one volume to the other. The maximum supported block size is 4KB. Nov 8, 2021 · I just double checked the default job settings with DataDomain: Compression is set to optimal per default. Adjusting the Veeam storage optimization settings will have an impact on an Object Storage based repository in terms of resulting object size, throughput utilization, PUT operations and processing time. VMCA2022, VMCE2023, CKA, CKAD. Apr 16, 2024 · Veeam Backup and Backup Copy Jobs - Compression and Deduplication. Veeam Vanguard, Veeam Legend. Thank you! Follow Oct 15, 2023 · OK, fine : then we set the block size of the primary backup-job to 4MB instead of the recommended (by Veeam) 1MB block size and run an active full so the 4MB block size is active on the primary repository. It‘s not possible. Jul 14, 2016 · New XFS file system block size is not retained after a reboot dev/mapper/centos-veeamrepo with a block size of 4K bytes. Feb 2, 2022 · It occurred to me that, when using Performance backup file placement, if a full backup file and an incremental were placed on separate extents there would be no way for the two separate XFS filesystems to fast clone the blocks to quickly complete the merge. 创建完成，可按需 . Sep 14, 2021 · 2、新建备份策略的注意事项：. With this option selected, Veeam Agent will use data block size of 256 KB. xfs promises issues mounting such volumes. A full backup won’t be faster, but merges, synthetic fulls will be much much much faster then NTFS. xfs man page for the -b option). Additionally, you’ll get space savings with ReFS or XFS. On the bottom layer, the Synology FS will be BTRFS. I just read throug Space Savings Considerations: Block size matters! Whether you’re using a storage that supports block clone savings (i. dsmISI enables Veeam to utilize XFS block cloning to dramatically reduce the Nov 19, 2020 · Over time this will shrink back when XFS reflink does the same thing as ReFS block clone. Cyclic redundancy check (CRC) is enabled. mikeman91095. Supported distributions: Ubuntu 19. Today, I see that the kernel is version is up to 5. 4、发起备份任务后，可在Linux系统上输入以下命令检查Veeam服务组件 May 13, 2022 · 256 KB. In the working area, right-click one node of the scale-out repository (SOBR) and click Edit Repository. You have to map backup jobs of course, after the cloning and do a compact operation. The more data blocks there are, the more time is required ZFS does not have the block clone capabilities that make synthetic operations exponentially faster for Veeam. 4 or later. XFS on Linux currently only supports pagesize or smaller blocks. 合成フルは Oct 15, 2023 · OK, fine : then we set the block size of the primary backup-job to 4MB instead of the recommended (by Veeam) 1MB block size and run an active full so the 4MB block size is active on the primary repository. When selecting the data block size, consider the following aspects: When reading the VM image, Veeam Backup & Replication "splits" the VM image into blocks of the selected size. In addition, it is important to grasp the impact larger storage optimization settings have on the size of backup increments. Dec 17, 2015 · Re: V11 XFS Supported OS. That might happen on ext3, for example. Backup data is stored in the form of objects on object storage, in the case of Azure these are blobs stored in a storage account. This post shows three ways to analyse ReFS space savings with Block cloning. Veeam Job size is set to use 1MB Blocks (Local) Jan 7, 2021 · Following on recommendation of the veeam support. - With FastClone, we don't need to copy data blocks. 0. Finally, with echo we write the value in the output. This also is in reference to using an array as your Volume-backed storage. What I stronly dislike here is that the last time we did this, with Veeam B&R 9. Apr 3, 2024 · The optimal data block size depends on the type of storage you select as a target and the size of your files. From what I’m understanding, reflink, crc, and the data block size is set by the following command, otherwise it wouldn’t be set would it? mkfs. Thus, it is quite important to tune stripe size to the particular workload. Jan 23, 2023 · A rack full of high-density servers give around 8 PB native capacity. g. Apr 5, 2024 · To configure a Linux backup repository for work with Fast Clone, perform the following steps: Format the disk where backups will be stored using the following XFS volume format string: mkfs. Jul 26, 2021 · Re: Feature Request: BTRFS or OpenZFS Backup Repository. The unique blocks + duplicate blocks pointers are stored on the ReFS file system and when you copy it, data is recombined and stored as full blocks on the target file system. As you remember, that was the only difference in the new setup — the new HBA controller. In this blog post, I show to do that. xfs -b size=4096 -m reflink=1,crc=1 /dev/sda1. oy qw vn tm dr au ud dm er jw