[zfs-discuss] raidz1 or raidz2

Gordan Bobic gordan.bobic at gmail.com
Fri Nov 2 14:22:19 EDT 2012


Indeed, it does. My resilvering takes over a day and I use 1TB disks.

Gordan

On 11/02/2012 05:09 PM, Christ Schlacta wrote:
> Gordan, I was under the impression that resilver time scaled with disk
> size, and not count. The 4 day period should be the same on any raid zn
> configuration he chooses
>
> On Nov 2, 2012 10:01 AM, "Gordan Bobic" <gordan.bobic at gmail.com
> <mailto:gordan.bobic at gmail.com>> wrote:
>
>     On 11/02/2012 04:34 PM, Brian Menges wrote:
>
>         Recalling an older post:
>         http://mail.opensolaris.org/__pipermail/zfs-discuss/2010-__September/044701.html
>         <http://mail.opensolaris.org/pipermail/zfs-discuss/2010-September/044701.html>
>
>         SNIP ---
>         RAIDZ2 vdevs should have 4, 6, or 10 devices in each vdev
>         RAIDZ3 vdevs should have 5, 7, or 11 devices in each vdev
>         SNIP ---
>
>         My recommendation would be to use RaidZ2 with 10 devices per
>         vdev; this fits nicely with 60 disks assuming that they're all
>         for the pool. Given they're 3tb disks, I'd strongly suggest
>         RaidZ2 over RaidZ1 for previously noted reasons - reslivering
>         will murder this array. RaidZ3 is appealing, but you're going to
>         have to declare some spares at that point (and by declaring
>         spares, I mean leave them alone - blank non-allocated devs since
>         spares are still broken in rc11 to my knowledge). In a RaidZ3
>         I'd suggest 7 devices per vdev, times 8 means you'd use 56
>         drives, you'll have 4 spares available.
>
>         Recap
>
>         Raidz2 - 10 devices per vdev, 6 vdevs
>         Raidz3 - 7 devices per vdev, 8 vdevs, 4 remaining devices as
>         "spares"
>
>
>     (8+2)x3TB is pushing your luck, IMO. You are looking at resilvering
>     time of about 4-5 days. I wouldn't use more than 4+2 with disks that
>     are so large.
>
>     Gordan
>



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