[gpfsug-discuss] A net new cluster

Christopher Black cblack at nygenome.org
Fri Mar 29 17:45:40 GMT 2019


Our understanding is there is no supported way to create an SBA-enabled pool other than as part of a filesystem that is already at a sufficient 5.x level (we've heard this a couple times in discussions with multiple IBMers).
The other reasons for us include the perceived difficulty of in-place ESS upgrades compared to reprovisioning them as fresh building blocks in a new cluster. We've complained about how labor-intensive ESS upgrades are before - last time we did an upgrade there were over 15 manual steps per ess io node (many with wait 10m+ time between them and a non-automated check step) in addition to the 25+ steps on the management server. This becomes a multi-week project when you have 20+ ess io nodes and can only do 2-3 a day with careful babysitting. We'd be very interested in hearing the ess upgrade experiences from other large sites, but perhaps this is diluting the original purpose of the thread.

Best,
Chris

On 3/29/19, 1:30 PM, "gpfsug-discuss-bounces at spectrumscale.org on behalf of Matt Cowan" <gpfsug-discuss-bounces at spectrumscale.org on behalf of cowan at bnl.gov> wrote:


    On Fri, 29 Mar 2019, Christopher Black wrote:
    ...
    > Main reasoning of the new cluster for us is to be able to make a fully V19+ filesystem with
    > sub-block allocation.
    >
    > Our understanding from talking to IBM is that there is no way to upgrade a pool to be
    > SBA-compatible, nor is it advisable to try to create a new pool or filesystem in same
    > cluster and then migrate (partially because migrating between filesystems within a cluster
    > with afm would require going through nfs stack afaik).
    ...

    Could you just use policy to migrate to the new pool?  no afm required.

    "partially because"... what are the other reasons?
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