[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
>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>
>>> wrote:
>>>
>>>> "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.)
>>
>> _______________________________________________
>> zfs-discuss mailing list
>> zfs-discuss at list.zfsonlinux.org
>> http://list.zfsonlinux.org/cgi-bin/mailman/listinfo/zfs-discuss
>>
>>

So I should configure all 15 disks as one RAIDZ2 or three RAIDZ1 of five disks each?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.zfsonlinux.org/pipermail/zfs-discuss/attachments/20180414/436b7a1b/attachment.html>


More information about the zfs-discuss mailing list