Snapraid split parity This tells snapraid which parity file it is. Make a backup of existing snapraid I suppose the split-parity files in A & B in this phase shoud be empty or non-existing. You will have to do it by hand and I can't find the feature documented in the SnapRAID docs. Nov 19, 2022 · The snapraid plugin (version 6. you will not be able to recover any data if you do not have at least two parity levels. The diff script will have to be updated to handle multiple arrays. parity. I was curious about the new split parity feature in v11 and downloaded the beta version from 2016-04-29 to test it. It is called "split parity. If a split-parity file is different from a single parity file computed on the same data files (for example for a different header), I think that a simple snapraid option could convert it without the need to recompute all the data So if you have 2x 4tb drives and 4x 8tb drives you cannot use either of the 4tb drives for parity Snapraid 11 and newer supports split parity, so 2x4tb drives can be used/treated as a single parity drive for up to 4 8tb drives, after which parity drives should be added following this table. In your 3TB example, typically you'd reduce the data partition of the data drives slightly. This version introduces split parity, which allows you to spread your parity files across numerous disks. Every run of the command checks about the 8% of the array, but not data already scrubbed in the previous 10 days. I have 16 drives, 14 data and 2 parity. Nov 21, 2016 · Andrea, just released the latest version of SnapRAID. Snapraid version 11 and newer adds split parity files. Version: 7. This makes transitioning up to larger data disks much easier and can mitigate the need to buy larger disks just for parity. I'm going to try the split parity like this According to the changelog, split parity doesn't seem to have a limit on the number of disks, but I agree two disks dedicated for 1-parity would be my limit. . On the bottom, all 6 data drives are sharing the same part of the parity drive, surpassing the recommended number of drives for a single parity volume. Split parity works like this: When first parity disk for first parity level is full it continues to fill parity on the next parity disk for that parity level and then the next and the next until done. I've been using SnapRAID for years and am now trying to use split-parity (having upgraded to 8TB drives) I have 5 data drives and the most amount of space used on any one data drive is 6,966GB. Also, I have updated my SnapRAID tutorial to reflect the update to This command verifies the data in your array comparing it with the hash computed in the "sync" command. Then add a 4TB drive (as an example), set it as the new parity drive, and run a SYNC. With that I have 2 questions: - Is there a plan to include that support in the plugin? - If not, would it be possible to allow manual . What are the SnapRAID 'parity' and 'N-parity' files? They are the files used by SnapRAID to store the parity data used in recovering. conf. How to configure SAMBA to share the Pool directory Jan 8, 2022 · Hello Everyone, I as as O am aware current version of SnapRAID plugin does not allow parity data to be split. My understanding is that as long as the total size of all the parity files + remaining free space is at least as much as the biggest drive, there won't be a need to have a dedicated Each level of parity can be split into multiple parts on multiple disks / partitions via split parity function. You can use the -p, --plan option to specify a different amount, and the -o, --older Anyway, it's not possible at now to configure SnapRAID to split the parity in multiple files. Hopefully the way split parity is handled makes sense. It' surely possible to change SnapRAID to support it, and likely it's not even too complex. So greyhole seems a bit more flexible in this regard. If this disk dies, there are already two failures (parity and one data). Modify parity in snapraid. Jan 6, 2019 · SnapRAID - A quick how-to Software RAID for protecting your data when you don't want to actually use RAID Jan 31, 2020 · There is a solution for you that uses your two 2TB disks for parity. SnapRAID Split Parity Sync Script. For example, let’s say I run snapraid once a night and I have 11 data drives so I use the "2-parity" option to be able to recover from 2 drive failures. There's a new field "parity number" that seems to be incorrect if you do an in place upgrade from OMV 6. Ignoring the option of split-parity, the only space you need to be concerned with is ensuring no individual disk is larger than the parity disk (plus a little overhead). In the top figure, the drives are split among the available parity space, so that each part of the parity drive only has 3 overlapping drives. parity 2-parity /snapraid2/snapraid2. Jan 18, 2025 · Split Parity is a new SnapRAID feature that is supported in OMV7: - While the rule, "the parity drive must equal or exceed the size of the largest protected data drive" still applies; split parity allows combining smaller drives to create what appears to be a single large parity drive. snapraid check -d parity will check the first parity regardless if it is one or many files. Apr 12, 2024 · Hey folks, quick question about OMV 7 and snapraid. Nov 28, 2017 · Currently the plugin increments a counter every time a disk is marked as a parity disk. You can use the -p, --plan option to specify a different amount, and the -o, --older Jan 17, 2016 · SnapRAID added a sweet feature, split parity. If you add a second parity level Nov 17, 2016 · SnapRAID added a sweet feature, split parity. Normally each parity is a single file but it can also be split up to into smaller parts using the split parity function. I launched another sync, and I think everything is alright, now. GitHub Gist: instantly share code, notes, and snippets. For example, let’s say you add an array made up of (4) 4TB data disks and (1) 4TB parity disk. But I couldn't figure out how to specify the multiple parity files. and it is very stressy for the disk during pariy calculation since there are really a lot of head moves (between data and parity). " However, I don't think the OMV SnapRAID plugin can be used to configure it. In the past, adding larger data disk always came with the issue of needing parity disks as large or larger than your data disks. On snapraid you have one or multiple parity drives for the whole array, and the parity drives have to be larger than the largest data drive you have (although you can use split parity, where a single parity volume is split over multiple physical drives). This command verifies the data in your array comparing it with the hash computed in the "sync" command. To avoid having to switch parity drives down the road, I thought that I could use the split parity feature to spread the parity data over the existing data disks. Simply turn off parity on the 3TB drive, reformat it and add it to SNAPRAID as a data disk. And if you want to get an even larger drive than 3TB, you could use it as well. Run snapraid sync -R; The obvious downside would be that any pre-existing parity is effectively wiped at the start of sync -R, so there is no way to recover from errors during the sync. Delete the split parity files. -- Hey, New to snapraid and don't think my parity disk/config are set up properly (possibly not sized properly on top of that as well) I currently have 12 x 8TB drives and 4 x 4TB drives as my data drives and 6 x 4TB drives as my parity drives. If you have more than 1 parity you could instead do this: 1. About the metadata, SnapRAID stores it completely in the "content" file. I'll take it into consideration as a new feature. config… Aug 16, 2019 · You can. Previously my config was like this parity /snapraid1/snapraid1. Here is an example of dual parity but parity file 1 is actually split into 2 parts on 2 different disks. split a disk into two partitions to have data and parity on it is a very very bad idea. snapraid-split-parity-sync-script/ SnapRAID added a sweet feature, split parity. You can read more about it’s features here. x. But I don't think it's a terrible idea The great thing about SnapRAID is it's entirely file-based, so you strictly don't need all the capacity they say you need for parity, if you don't Feb 9, 2023 · How do I add a second parity drive in SnapRAID plug-in? That is the new version of the snapraid plugin that supports multiple arrays and split parity. snapraid check -d 2-parity will check the second parity regardless if it is one or many files. Splitting the parity helps distributing the parity and assembling disks to make a big enough volume that is now able to compute parity. These files will grow in size as the biggest amount of data stored in a single disk of the array. 2) that supports split parity and multiple arrays is now in the testing repo. When looping through the disks, there is no chance to write multiple disks to one parity line let alone knowing which parity level it is. Done. x to 7. This was a fairly substantial change which is why it is in the testing repo. When I upgraded, all the drives got a… Jun 21, 2024 · Now I think that I have understood : split parity is useful when you have many disks that are not able to handle individually a parity. whtrfd zarm vkuwu ogkaun dwj cudyf dwgup eyzivj ksrg moy oaxlpr ejmf slvzesma kwwyt xrfr