[zfs-discuss] ZFS on RAID-5 array

H agents at meddatainc.com
Sat Apr 14 18:18:31 EDT 2018

On April 12, 2018 6:54:56 PM EDT, Gordan Bobic <gordan.bobic at gmail.com> wrote:
>With that many disks, I would recommend at least RAIDZ2, or maybe 3x
>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>
>>> wrote:
>>>> "Can you illustrate a specific case where ZFS on RAID5 will yield
>>>> performance than RAIDZ of same geometry, that is NOT dependent on
>>>> 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
>>>> present each disk separately. And buying new hardware may not be an
>>> The OP was asking for pros and cons, which implies that he has a
>> 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
>> 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
>> setting asides two disks as hot-spares (if you can do that with ZFS.)
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So I should configure all 15 disks as one RAIDZ2 or three RAIDZ1 of five disks each?
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