![]() To work around this fragmentation you can schedule regular active full backups, but they will require 100% space on the disk compared to synthethic fulls which just take the additional space of an incremental backup. ReFS allows to use the Veeam Fast Clone feature which allows very fast synthetic operations for full backups and merges. Both have advantages and disadvantages during different backup situations. You can use both Microsoft filesystems for a Veeam repository. ![]() The main difference for block-based repositories is the choice of available file systems. There are only small differences between Linux and Windows which result from using different schedulers for I/O and compute. Read and write request processing with write-back cache utilization is shown in the figure below. To get the best out of a synthetic backup and enhance the performance, it is recommended to use a write-back cache. To go for bigger repositories, we recommend using a Scale-Out Backup Repository with multiple extents. This helps keeping failure domains small and managable. In general we recommend to not size volumes larger than 200TB. This aligns best with the Veeam I/O profile and reduces write overhead.įor more information, refer to this blog post at Volume sizes If possible, set the block size at the filesytem layer as close as possible to the expected Veeam block size.įor the storage array below configure a strip(e) size of 128K or 256K for best performance. It means that one block will consume eight blocks at the filesytem level, but no block will be wasted, as the two are aligned. The Veeam block size (after compression) of 512KB is going to be written in the underlying filesytem, which has a block size of 64k. There are three layers where the block size can be configured: Veeam block size for the backup files, the filesystem and the storage volumes. This value can be used to better configure storage arrays especially low-end storage systems can greatly benefit from an optimized stripe size. Since compression ratio is very often around 2x, with this block size, Veeam will write around 512KB or less to the repository per Veeam block. You can customize the block size during the job configuration using the storage optimization setting of the backup job.īy default, Veeam’s block size is set to local target, which is 1MB before compression. However, it is highly recommended to test this prior to deployment whenever possible.ĭuring the backup process, data blocks are processed in chunks and stored inside backup files in the backup repository. Block sizesĪs can be seen from the field, optimal value for the stripe size is often between 128KB and 256KB. ![]() A block storage device can be a local disk ( Direct Attached Storage) or a LUN provided via a Storage Area Network like iSCSI or Fibre Channel. These kinds of repositories do provide a block storage device to a Windows or Linux repository server. This site uses Just the Docs, a documentation theme for Jekyll. Restoring VMs to an HPE 3PAR with thin disks.Backup Repository HA using Windows Storage Replica. ![]()
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