[zfs-discuss] ZFS on RAID-5 array

H agents at meddatainc.com
Sun Apr 15 13:58:49 EDT 2018


On April 14, 2018 6:25:17 PM EDT, Gordan Bobic <gordan.bobic at gmail.com> wrote:
>Personally I'd go with 3x 5-disk RAIDZ1. It'd be 3x faster.
>
>On Sat, 14 Apr 2018, 23:18 H via zfs-discuss, <
>zfs-discuss at list.zfsonlinux.org> wrote:
>
>> 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.)
>>>>
>>>> _______________________________________________
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>>>> zfs-discuss at list.zfsonlinux.org
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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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>>

The disks are Hitachi enterprise-class disks but only 300 Gb each - does that change your recommendation?
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