Unraid how many parity drives Feb 7, 2017 · I am pulling two 5TB drives from my QNAP NAS and am debating using them as a pair of parity drives or just use the second one for my array. Used to run 1 parity for 10 drives for years. The added bit is known as a parity bit. You always lose the number of drives dedicated to parity. Remove extraneous drives 4. Use the two SSDs for cache or a raid1 pool for something you need to keep on fast drives. While it’s unfortunate you’d burn two of the 18TB drives for parity, I absolutely feel that two parity drives is the way to go. Thanks! Jan 7, 2018 · I have 1 parity for 5 drives. So the 57th bit of the parity drive is the parity bit for the 57th bit of all of the data drives. In Unraid, the parity bits are stored on a parity drive independent of the data drives. - Pro licensed version, 20 data drives, 1 parity drive, 1 cache drive. 2. Jun 7, 2021 · Nope, got it backwards. The writes will be relatively random across the array drives and every one will required a 'read and rewrite' of a block of tracks on the shingled drive to keep the parity aligned. From a user perspective, this results in the system reacting as if the failed drive is still present. May 6, 2021 · 1. Feb 7, 2017 · I am pulling two 5TB drives from my QNAP NAS and am debating using them as a pair of parity drives or just use the second one for my array. Yes, whichever disk is parity has to be the same size or larger than your largest data drive. Thanks! I have 1 parity for 5 drives. What are the real odds of needing more than one? If you are running 14 drives, I would recommend running two parity drives. Just my opinion. Final parity check Does that seem like a reasonable order of operations? Oct 21, 2020 · In an array with 6 drives, a write to any drive triggers a parity write. With 6 drives potentially being updated, thats a lot of extra work. I use 1 drive for parity myself. If all of the drives were bought at the same time from the same vendor and one drive fails, you would have a slightly higher chance of another drive failing during the rebuild. Remove parity 1x 4TB drive 2 (ensure parity is still valid) 6. UnRaid supports a maximum of 30 drives (28 x data + 2 x parity) in its main array. It's just a waste to have 8TB parity when your largest data drive is a single 5TB. Move data (using unBalance) *9. Dec 1, 2022 · With a single parity drive you can handle 1 drive failing, whereas with 2 parity drives you can handle 2 drives failing simultaneously. There have been rumours of allowing 3 but no confirmation or ETA for this. I think your priority should be replacing those 2-3TB drives with 8TB ones. - Plus licensed version, 5 data drives, 1 parity drive, 1 cache drive. You'll get better performance with just 1 parity vs 2. Replace 1x 4TB parity with 1x 8TB parity 7. May 5, 2021 · 3. But, as you know, you'll have better protection with 2 drives in parity. If you have sufficient parity drives then Unraid will emulate the failed drive using the combination of the parity drive(s) and the remaining 'good' drives. Dec 14, 2012 · - Basic (free) version, 2 data drives, 1 parity drive, no cache drive. Maximum fault tolerance with the main Unraid array is 2 drives. But that's because I only have about 12 hard drives (one parity, the rest data all 12TB drive). Nov 7, 2021 · You'll get better performance with just 1 parity vs 2. That being said, unraid not being raid but jbod, even in the case of more failures than parity, you still have the data on the working disks (with raid0/5/6 everything is gone if more disks than parity fail). I am curious if many of you run pairs or not. . This parity bit works across the set of bits in the same relative bit position on each drive. Add 2x 8TB drives and re-designate old 1x 4TB as a data disk for the array 8. On the parity array, all non-failing drives are fine, and you can rebuild as many failing drives as you have parity drives, max of 2. Note, however, that this is just a protection against drive failure (think of it as high availability). The cache pools are purely BTRFS RAID for multiple disks, so a RAID 0 is completely broken with no recovery if a drive fails. Run a parity check 5. 3. ehyfrd ikjr hqfhdr xqpk ofam hvloxvqf bdyl gxccs eddaa tsbz yrbdm elyglbcc vzo kujdyr ptilf