[zfs-discuss] ZFS on RAID-5 array
gordan.bobic at gmail.com
Thu Apr 12 18:54:56 EDT 2018
With that many disks, I would recommend at least RAIDZ2, or maybe 3x RAIDZ1
if performance is a concern.
On Thu, Apr 12, 2018 at 11:46 PM, H via zfs-discuss <
zfs-discuss at list.zfsonlinux.org> wrote:
> On April 12, 2018 3:34:46 PM EDT, Gordan Bobic via zfs-discuss <
> zfs-discuss at list.zfsonlinux.org> wrote:
>> On Thu, Apr 12, 2018 at 8:31 PM, Alex Chekholko <alex at calicolabs.com>
>>> "Can you illustrate a specific case where ZFS on RAID5 will yield better
>>> performance than RAIDZ of same geometry, that is NOT dependent on ensuring
>>> good alignment as per what I described?"
>>> Yeah, in the case where you are provided LUNs you don't control and
>>> can't run your own disks :) I've run ZFS on systems where the storage was
>>> provisioned off some enterprise SAN and buying whiteboxes was not an option.
>> Except that isn't an answer to the specific question that I asked.
>>> Even if the OP controls their FC array, it may not have an option to
>>> present each disk separately. And buying new hardware may not be an option.
>> The OP was asking for pros and cons, which implies that he has a choice.
> That is correct, I do have a choice. It's a FC array with 15 disks that I
> control and just configured as two RAID-5 arrays spanning over 13 disks
> with two hot-spares. I have not begun using it yet and can easily
> reconfigure it.
> Most posts until now seem to suggest a JBOD with ZFS on it and presumably
> setting asides two disks as hot-spares (if you can do that with ZFS.)
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