[zfs-discuss] ZFS on RAID-5 array

Edward Ned Harvey (zfsonlinux) zfsonlinux at nedharvey.com
Sun Apr 15 09:01:28 EDT 2018


> From: zfs-discuss <zfs-discuss-bounces at list.zfsonlinux.org> On Behalf 
> Of H via zfs-discuss
> 
> So I should configure all 15 disks as one RAIDZ2 or three RAIDZ1 of 
> five disks each?

Either way is fine. You have to decide what performance/space/reliability characteristics are most suited to your needs. You could also go with 7 mirrors + spare. Or raidz3, although raidz3 seems excessive.

7 mirrors: read IOPS of 14 disks, write IOPS of 7 disks, read throughput of 14 disks, write throughput of 7 disks, capacity of 7 disks, guaranteed survival of at least 1 failure, probable survival of 3 concurrent failures, max survivable 7 concurrent failures

3x raidz1: read IOPS of 3 disks, write IOPS of 3 disks, read throughput of 12 disks, write throughput of 3 disks, capacity of 12 disks, guaranteed survival of at least 1 failure, probable survival of 2 concurrent failures, max survival 3 concurrent failures

1x raidz2: read IOPS of 1 disk, write IOPS of 1 disk, read throughput of 13 disks, write throughput of 13 disks, capacity of 13 disks, guaranteed survival of 2 failures, max survival 2 concurrent failures


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