[zfs-discuss] ZFS on RAID-5 array

Gordan Bobic gordan.bobic at gmail.com
Sat Apr 14 18:25:17 EDT 2018


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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>>>
>>>
>>
> So I should configure all 15 disks as one RAIDZ2 or three RAIDZ1 of five
> disks each?
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