[zfs] an interesting survey -- the zpool with most disks you have ever built
Fred Liu
fred.fliu at gmail.com
Tue Mar 8 03:50:06 UTC 2016
2016-03-07 13:55 GMT+08:00 Julian Elischer <julian at freebsd.org>:
> On 6/03/2016 9:30 PM, Fred Liu wrote:
>>
>> 2016-03-05 0:01 GMT+08:00 Freddie Cash <fjwcash at gmail.com>:
>>
>>> On Mar 4, 2016 2:05 AM, "Fred Liu" <fred.fliu at gmail.com> wrote:
>>>>
>>>> 2016-03-04 13:47 GMT+08:00 Freddie Cash <fjwcash at gmail.com>:
>>>>>
>>>>> Currently, I just use a simple coordinate system. Columns are letters,
>>>
>>> rows are numbers.
>>>>>
>>>>> "smartos-discuss at lists.smartos.org" <smartos-discuss at lists.smartos.org
>>>>
>>>> 、
>>>
>>> developer <developer at open-zfs.org>、
>>>
>>> illumos-developer <developer at lists.illumos.org>、
>>>
>>> omnios-discuss <omnios-discuss at lists.omniti.com>、
>>>
>>> Discussion list for OpenIndiana <openindiana-discuss at openindiana.org>、
>>>
>>> illumos-zfs <zfs at lists.illumos.org>、
>>>
>>> "zfs-discuss at list.zfsonlinux.org" <zfs-discuss at list.zfsonlinux.org>、
>>>
>>> "freebsd-fs at FreeBSD.org" <freebsd-fs at freebsd.org>、
>>>
>>> "zfs-devel at freebsd.org" <zfs-devel at freebsd.org>
>>>
>>>>> Each disk is partitioned using GPT with the first (only) partition
>>>
>>> starting at 1 MB and covering the whole disk, and labelled with the
>>> column/row where it is located (disk-a1, disk-g6, disk-p3, etc).
>>>>
>>>> [Fred]: So you manually pull off all the drives one by one to locate
>>>
>>> them?
>>>
>>> When putting the system together for the first time, I insert each disk
>>> one at a time, wait for it to be detected, partition it, then label it
>>> based on physical location. Then do the next one. It's just part of the
>>> normal server build process, whether it has 2 drives, 20 drives, or 200
>>> drives.
>>>
>>> We build all our own servers from off-the-shelf parts; we don't buy
>>> anything pre-built from any of the large OEMs.
>>>
>> [Fred]: Gotcha!
>>
>>
>>>>> The pool is created using the GPT labels, so the label shows in "zpool
>>>
>>> list" output.
>>>>
>>>> [Fred]: What will the output look like?
>>>
>>> From our smaller backups server, with just 24 drive bays:
>>>
>>> $ zpool status storage
>>>
>>> pool: storage
>>>
>>> state: ONLINE
>>>
>>> status: Some supported features are not enabled on the pool. The pool can
>>>
>>> still be used, but some features are unavailable.
>>>
>>> action: Enable all features using 'zpool upgrade'. Once this is done,
>>>
>>> the pool may no longer be accessible by software that does not support
>>>
>>> the features. See zpool-features(7) for details.
>>>
>>> scan: scrub canceled on Wed Feb 17 12:02:20 2016
>>>
>>> config:
>>>
>>>
>>> NAME STATE READ WRITE CKSUM
>>>
>>> storage ONLINE 0 0 0
>>>
>>> raidz2-0 ONLINE 0 0 0
>>>
>>> gpt/disk-a1 ONLINE 0 0 0
>>>
>>> gpt/disk-a2 ONLINE 0 0 0
>>>
>>> gpt/disk-a3 ONLINE 0 0 0
>>>
>>> gpt/disk-a4 ONLINE 0 0 0
>>>
>>> gpt/disk-a5 ONLINE 0 0 0
>>>
>>> gpt/disk-a6 ONLINE 0 0 0
>>>
>>> raidz2-1 ONLINE 0 0 0
>>>
>>> gpt/disk-b1 ONLINE 0 0 0
>>>
>>> gpt/disk-b2 ONLINE 0 0 0
>>>
>>> gpt/disk-b3 ONLINE 0 0 0
>>>
>>> gpt/disk-b4 ONLINE 0 0 0
>>>
>>> gpt/disk-b5 ONLINE 0 0 0
>>>
>>> gpt/disk-b6 ONLINE 0 0 0
>>>
>>> raidz2-2 ONLINE 0 0 0
>>>
>>> gpt/disk-c1 ONLINE 0 0 0
>>>
>>> gpt/disk-c2 ONLINE 0 0 0
>>>
>>> gpt/disk-c3 ONLINE 0 0 0
>>>
>>> gpt/disk-c4 ONLINE 0 0 0
>>>
>>> gpt/disk-c5 ONLINE 0 0 0
>>>
>>> gpt/disk-c6 ONLINE 0 0 0
>>>
>>> raidz2-3 ONLINE 0 0 0
>>>
>>> gpt/disk-d1 ONLINE 0 0 0
>>>
>>> gpt/disk-d2 ONLINE 0 0 0
>>>
>>> gpt/disk-d3 ONLINE 0 0 0
>>>
>>> gpt/disk-d4 ONLINE 0 0 0
>>>
>>> gpt/disk-d5 ONLINE 0 0 0
>>>
>>> gpt/disk-d6 ONLINE 0 0 0
>>>
>>> cache
>>>
>>> gpt/cache0 ONLINE 0 0 0
>>>
>>> gpt/cache1 ONLINE 0 0 0
>>>
>>>
>>> errors: No known data errors
>>>
>>> The 90-bay systems look the same, just that the letters go all the way to
>>> p (so disk-p1 through disk-p6). And there's one vdev that uses 3 drives
>>> from each chassis (7x 6-disk vdev only uses 42 drives of the 45-bay
>>> chassis, so there's lots of spares if using a single chassis; using two
>>> chassis, there's enough drives to add an extra 6-disk vdev).
>>>
>> [Fred]: It looks like the gpt label shown in "zpool status" only works in
>> FreeBSD/FreeNAS. Are you using FreeBSD/FreeNAS? I can't find the similar
>> possibilities in Illumos/Linux.
>
>
> Ah that's a trick.. FreeBSD exports an actual /dev/gpt/{you-label-goes-here}
> for each labeled partition it finds.
> So it's not ZFS doing anything special.. it's what FreeBSD is calling the
> partition.
>
Super cool!
Fred
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