[gpfsug-discuss] Disabling individual Storage Pools by themselves? How about GPFS Native Raid?

[Zachary Giles]

Ya, that's why I mentioned you'd probably have to fiddle with some
scripts or something to help GNR figure out where disks are. Is
definitely known that you can't just use any random enclosure given
that GNR depends highly on the topology. Maybe in the future there
would be a way to specify the topology or that a drive is at a
specific position.

On Fri, Jun 19, 2015 at 12:05 PM, Allen, Benjamin S.
<bsallen at alcf.anl.gov> wrote:
>> One imagines that GNR uses the SCSI enclosure services to talk to the
>> shelves.
>
> It does. It just isn't aware of SAS topologies outside of the supported hardware configuration. As Sven mentioned the issue is mapping out which drive is which, which enclosure is which, etc. That's not exactly trivial todo in a completely dynamic way.
>
> So while GNR can "talk" to the enclosures and disks, it just doesn't have any built-in logic today to be aware of every SAS enclosure and topology.
>
> Ben
>
>> On Jun 19, 2015, at 10:15 AM, Jonathan Buzzard <jonathan at buzzard.me.uk> wrote:
>>
>> On Fri, 2015-06-19 at 10:56 -0400, Zachary Giles wrote:
>>> I think it's technically possible to run GNR on unsupported trays. You
>>> may have to do some fiddling with some of the scripts, and/or you wont
>>> get proper reporting.
>>> Of course it probably violates 100 licenses etc etc etc.
>>> I don't know of anyone who's done it yet. I'd like to do it.. I think
>>> it would be great to learn it deeper by doing this.
>>>
>>
>> One imagines that GNR uses the SCSI enclosure services to talk to the
>> shelves.
>>
>> https://en.wikipedia.org/wiki/SCSI_Enclosure_Services
>> https://en.wikipedia.org/wiki/SES-2_Enclosure_Management
>>
>> Which would suggest that anything that supported these would work.
>>
>> I did some experimentation with a spare EXP810 shelf a few years ago on
>> a FC-AL on Linux. Kind all worked out the box. The other experiment with
>> an EXP100 didn't work so well; with the EXP100 it would only work with
>> the 250GB and 400GB drives that came with the dam thing. With the EXP810
>> I could screw random SATA drives into it and it all worked. My
>> investigations concluded that the firmware on the EXP100 shelf
>> determined if the drive was supported, but I could not work out how to
>> upload modified firmware to the shelf.
>>
>> JAB.
>>
>> --
>> Jonathan A. Buzzard                 Email: jonathan (at) buzzard.me.uk
>> Fife, United Kingdom.
>>
>>
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-- 
Zach Giles
zgiles at gmail.com