On Thu, 2022-11-10 at 08:48 -0500, Dan Ritter wrote: > hw wrote: > > And I've been reading that when using ZFS, you shouldn't make volumes with > > more > > than 8 disks. That's very inconvenient. > > > Where do you read these things?
I read things like this: "Sun™ recommends that the number of devices used in a RAID-Z configuration be between three and nine. For environments requiring a single pool consisting of 10 disks or more, consider breaking it up into smaller RAID-Z groups. If two disks are available, ZFS mirroring provides redundancy if required. Refer to zpool(8) for more details." That's on https://docs.freebsd.org/en/books/handbook/zfs/ I don't remember where I read about 8, could have been some documentation about FreeNAS. I've also been reading different amounts of RAM required for deduplication, so who knows what's true. > The number of disks in a zvol can be optimized, depending on > your desired redundancy method, total number of drives, and > tolerance for reduced performance during resilvering. > > Multiple zvols together form a zpool. Filesystems are allocated from > a zpool. > > 8 is not a magic number. > You mean like here: https://pthree.org/2012/12/21/zfs-administration-part-xiv-zvols/ That seems rather complicated. I guess it's just a bad guide. I'll find out if I use ZFS.
