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Because you can't easily change the size of the disks one at a time. How would you migrate from 4 x 4TB to 4 x 6TB disks by buying one disk at a time?
by shock 6y ago
Because you can't easily change the size of the disks one at a time. How would you migrate from 4 x 4TB to 4 x 6TB disks by buying one disk at a time?
- yjftsjthsd-h 6y agoYou replace each disk in turn, then grow the pool, right? You don't get the increased capacity until you're done, but still workable.
- theshrike79 6y agoWorkable, but not the point. This is why I picked Synology as my nas. The Synology Hybrid Raid system let me just shove all my extra drives in the 4 bay NAS and still have parity protection. Then I just slowly upgraded all drives to the current money/capacity optimum one or two at a time. If I was made of money and could afford to upgrade all the drives in a pool in one go, I'd definitely go for ZFS too.
- hestefisk 6y agoYou don’t need to upgrade at once. You can upgrade gradually with the right config.
- hestefisk 6y agoYou gradually replace one disk at a time, resilver then repeat. ZFS automates most or all the work mentioned in this article and it comes with built-in bitrot detection. Btw I have run a NAS similar to this machine for 6 years now using FreeNAS. It’s awesome.
- shock 6y agoSo if I have 4x4TB drives and switch a drive so it's now 3x4TB + 1x6TB, and do the resilver, will the ZFS capacity be increased by 2TB?
- hestefisk 6y agoNo not until you have replaced them all.
- shock 6y agoIn that case, I don't understand why you replied to my comment asking "How would you migrate from 4 x 4TB to 4 x 6TB disks by buying one disk at a time?". In case it wasn't clear, the buying one disk at a time aspect is important, because storage needs increase steadily over time, not all at once, so it makes financial sense to buy a higher capacity drive and replace a lower capacity one over a longer period of time, instead of replacing all drives at once and then have most of the extra storage sit there unused.