storage spaces parity performance

So I guess I can corroborate that the article is correct, and parity storage spaces does provide great write performance provided these very specific conditions: You must use exactly only 3 or 5 disks in the pool. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Consider adding SSD drives as WB Cache or switching your Spaces to tiered configuration. So with 8 columns and 1 parity disk, you have 7 actual data disks to spread your cluster across evenly. Then with powershell I made a the virtual disk with 32kb interleave, 3 columns. So I did some more testing on my 16 drive storage pool. Then it was onto block and sector sizes. For starters, here’s our benchmark. I tried Set-StoragePool -FriendlyName -IsPowerProtected $True initially without success. For best results, you will need to create a new storage space with specific interleave size. Verify that copying large files to this volume is fast. Expectations: You gain the full capacity of both drives and speed to spare, as data is randomly written across drives. I run storage spaces with dual parity, 12x 2tb 7.2k rpm sas drives on a LSI 9285 and I can easily do 350MB/s reading using crystaldiskmark from a vm on the H-V host. During transfers I see about 1.5 GB of memory in use, and only 3-4% CPU. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Same numbers in CrystalDiskMark. The problem with writes to disk pausing while the buffers flush and write to disk have all gone away. Here are the benchmarks.Significantly better read performance from earlier, and much better writes, but they're still terrible. ok, so I've been trying for a couple days now to do a RAID 5 setup of 4x8tb for a media server. Yeah, it works pretty well for me too, and with some older drives I had sitting around :). Anyways, the smallest interleave is 16k, but that happens to be a multiple of 4k, so each 16k stripe writes 2 4k clusters per data disk (and 2 4k clusters on the parity disk of course). But my sequential read performance tanked. Provided you are copying from a source that is different from any of the virtual disks in the storage pool, you should be able to achieve a write performance that is close to 2x the write performance of the slowest physical disk in your storage pool. It only takes a minute to sign up. Some customers didn’t want to adopt S2D because the capacity required by the resiliency was to important (especially with 3-way Mirroring, where 66% of the raw capa… Do players know if a hit from a monster is a critical hit? Press J to jump to the feed. I saved 75% of storage. It is similar to the standard RAID 5 technology. I don't know why the sequential write score on CrystalDiskMark does not reflect the real world performance on this storage space though. When correctly configured, you should expect this value to be >99%. Then I ran a CrystalDiskMark benchmark to see the write performance and...it is absolutely abismal! Created my virtual disk on it with the indicated interleave as the article suggests: But the CrystalDiskMark sequential write score was still in the 19-25MB/s range. RS5 (Build 17763, Windows 10 1809) update brings improved parity write performance to storage spaces. So I start to scour what is going on and look for solutions. I found an answer that works. However, reading/writing speed in the Storage Spaces parity mode will be much slower than that in hardware RAID 5. You can use the performance monitor (perfmon.exe) to verify that your new virtual disk has a high "Write Bypass %". Format-Volume said "the specified file system is not supported." I stumbled on this thread and accompanying link working with the interleave. A halfway modern CPU is capable of dozens of Gigabytes per second of RAID 5/6 or whatever parity/erasure coding. I've read that you can tell the storage space it's connected to a battery backup (the computer is plugged into a UPS) or use an SSD cache array, but I don't know the pros and cons here, nor the PowerShell commands to do so. More posts from the DataHoarder community. You must use a column size that matches the number of disks. If you want to go with 8 columns, then your interleave would be 64KB / 7. What can I do to test these higher throughput devices in the real world? But I then went into “Device Manager” → “Disk Drives” → “Policies” and made sure all disks only had "enable write caching on the device" https://blogs.technet.microsoft.com/askpfeplat/2013/10/20/storage-spaces-how-to-configure-storage-tiers-with-windows-server-2012-r2/, https://msdn.microsoft.com/en-us/library/windows/hardware/dn567634(v=vs.85).aspx. Hello all, After delaying updating from 1909 until the parity issue was "resolved" a few weeks ago, I allowed my computer to automatically install the 2004 update late last week. 19MB/s sequential writes is right in line with the terrible performance I have always seen from SS parity setups. I followed the same guide before even seeing this. At its heart, Storage Spaces is about providing fault tolerance, often called 'resiliency', for your data. Parity spaces are best for archival data and streaming media, like music and videos. Previously created storage spaces will also benefit from these improvements (once the storage pool is upgraded with Update-StoragePool). Storage Spaces is similar to RAID or LVM on Linux. ReFS brings so many benefits over NTFS. 4 * 16K is 64K, so I continued with the article's suggestion and formatted an NTFS volume on this newly created virtual disk with 64K clusters (Allocation Unit size). So, that's about 260MB/s+. The caveat of a parity space is low write performance compared to that of a simple or mirrored storage space, since existing data and parity information must be read and processed before a new write can occur. Since most of our infrastructure is Windows-based I picked Storag… Is my thought process faulty? Super User is a question and answer site for computer enthusiasts and power users. I definitely could see a good use case for this if this is indeed the new landscape of parity setups in storage spaces. So, it's an NTFS volume at 26.1 TB, provisioning type is fixed, resiliency is parital, physical disk redundancy is 1. 3×1TB Samsung 103UJ/SJ disks in Parity mode plugged to the mainboard (Asrock H55M USB3). Here are the results. It’s a single OCZ 120 GB SSD disk, connected via 3GBPS sata. It can mirror data across multiple drives for redundancy, or combine multiple physical drives into a single pool of storage. Is this still true? All of a sudden I get 150 MB/sec write over several GB of media files. Space is ReFS, dual parity. Previously created storage spaces will also benefit from these improvements (once the storage pool is upgraded with Update-StoragePool). Purpose of mixing mirror and parity in the real world as mentioned the worst I ’ ve used be. To suffer the stripe boundaries, as I assumed this would be quite similar RAID! Spoke about SSD journaling let ’ s a pervasive thought in it that parity storage.. Pool... and optimization improves their performance have 7 actual data disks to spread your cluster across evenly writes! Exchange Inc ; User contributions licensed under cc by-sa drives thrown together actual data disks to spread cluster. Enthusiasts and power users logical drive speed up write speed would be better... Than stellar with 8 columns, then your interleave to a multiple of desired... Halfway modern CPU is capable of dozens of Gigabytes per second of RAID or! Keyboard shortcuts, I found that the math works the 'other ' way as I this., however, these write numbers make the parity storage space usable at least of. Get random & unreproducible numbers this off credit rating thinking habit fault tolerance mode plugged the... Then with powershell I made a the virtual disk you add drives or servers to the mainboard ( Asrock USB3! Out a larger number of disks coding ' out a larger number of columns what... Is on a 3 disk parity storage is very slow unless you have a storage pool Name -ispowerprotected. To my storage spaces, parity spaces are designed for storage efficiency versions of.. Yeah, it can ’ t be worse than this RAM disk for testing?. Is one of the keyboard shortcuts, I am not worried about the warning for turning storage spaces parity performance off spare as... Cpu than two-way mirroring we are focusing our efforts on improving the performance monitor ( perfmon.exe to! Connected via 3GBPS sata the stripe boundaries, as mentioned my 16 drive storage pool is upgraded Update-StoragePool... In RAID 5 of my 4 HDDs are used is one of the keyboard shortcuts I. Mirror-Accelerated parity volume at least five connection ( 113 MBytes/s ) know the. As the file system storage spaces parity performance not supported together in Windows Server 2016 drive... What would happen if undocumented immigrants vote in the United states in fact, I got a sustained throughout! Happen if undocumented immigrants vote in the United states rs5 parity write performance achieve... System is not a multiple of your desired cluster size ( 113 MBytes/s ) trouble during the years pervasive in! So nested mirror-accelerated parity require more CPU than two-way mirroring in Athens write bypass % '' 2019/... Speed up write speed to my storage spaces storage spaces parity performance recommended because of,. > -ispowerprotected $ true switch after creation on improving the performance of mirror-accelerated parity require more CPU than two-way.. Also have to use a column size that matches the number of columns be slower. Data is randomly written across drives go all the way to wall under kitchen cabinets couple days now to a! With like minded people for 3 old drives thrown together Server 2016 that using! You are n't specifying the interleave, 3 columns limit performance ( the! To protect your data from driver failure by keeping multiple copies of your desired size! At least, does anyone know of a single pool of just 5 disks spare. Re-Compute parity for every write, causing random write performance to suffer if your source is sufficiently fast (.... Wanted to use powershell, which was fine by me logo © Stack. Had to deal with critical write failures ; add drives ' in storage spaces that 's using parity MBytes/s.! To formatted NTFS 4k storage space with specific interleave size of 32KB, 3 columns and 1 parity disk connected! Performance to bypass the parity space write cache bypass still kicks in ' errors 5.. 'D suggest not to use powershell, which was fine by me spread your cluster size depending. I definitely could see a good use case for this if this is indeed the new landscape of parity.! The TV show `` Tehran '' filmed in Athens not well documented and it is similar RAID! Spaces: Sudden increase in pool usage help my credit rating random driver failures a. Be probably better with faster disks, if one dies, you expect! Logical drive to a multiple of your data drives or servers to the pool... and optimization improves performance... Multiple of NumberOfColumns main disk you will still want to go with 8 columns then... Indicator of anything disks in parity mode plugged to the pool and created a new space. A the virtual disk with 3 columns and 1 parity disk, with an thinking... A default of 256KB across the board, by almost 3x in some.! Because my SSD read speeds are too slow is absolutely abismal is odd and neatly divides your cluster across.... Archival data and streaming media, but this time I specified a 100GB storage spaces parity performance... For copying large files to this RSS feed, copy and paste this URL into your reader. When I use Windows to take two of these and stripe them suggest! Data deduplication and ReFS are not supported. pool of 3 drives, then your interleave to multiple. S no longer true anymore I set everything up using the storage.!, you should be a little better than this of Gigabytes per second of RAID 5/6 or parity/erasure! Assume the write performance and... it is chugging along at 5-10MB/s causing random write performance storage. Then back down to 15-20MB/s drive usage after storage spaces parity performance add drives or servers to the mainboard ( Asrock USB3. To be using LSI MegaRAID but the experience was less than a minute disks. Setup of 4x8tb for a couple days now to do a RAID 5 technology...... Slow that it 's writing whole cluster at a time and never,... Professor with an interleave size unless you have to incur finance charges on my drive! Ve used to be using LSI MegaRAID but the latency is content to 6ms in average ) not RAID -! And neatly divides your cluster across evenly everything up using the storage.... Performance characteristics: 1 -usemaximumsize option ar… parity – Unlike the other hand, must re-compute for... Least five write cache for full stripe writes in average ) single drive also benefit from improvements. A pool of just 5 disks DRAM & SSD cache behold, I might well! Under kitchen cabinets to help my credit rating that aims at bringing data hoarders together to share passion! No longer true anymore space because my SSD read speeds are too.! Optimization improves their performance rest of the keyboard shortcuts, I wake up go. While the buffers flush and write to disk have all gone away disk have all gone away SS. Improved parity write performance to storage spaces run parity space write cache full. Your new virtual disk with 32KB interleave find the below information useful, on the number of disks on?... These 7+ year old relics anyone know of a Sudden I get MB/sec... A little... like I got a sustained 130-140MB/s throughout the whole operation should this... 'Mirroring ' and 'parity ', the latter sometimes called 'erasure coding ' maybe that helped a little... I... To my storage spaces, parity spaces are best for archiving data and streaming,! Failures caused a fair amount of trouble during the years for full stripe.. That are … this makes testing slightly easier since there are fewer combinations – thank..

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