[gpfsug-discuss] slow filesystem

Damir Krstic damir.krstic at gmail.com
Wed Jul 10 13:22:37 BST 2019


mmlspdisk all --not-ok does not indicate any failed hard drives.

On Wed, Jul 10, 2019 at 7:22 AM Buterbaugh, Kevin L <
Kevin.Buterbaugh at vanderbilt.edu> wrote:

> Hi Damir,
>
> Have you checked to see whether gssio4 might have a failing internal HD /
> SSD?  Thanks…
>
> Kevin
>
> On Jul 10, 2019, at 7:16 AM, Damir Krstic <damir.krstic at gmail.com> wrote:
>
> Over last couple of days our reads and writes on our compute cluster are
> experiencing real slow reads and writes on one of the filesystems in the
> cluster. We are talking with IBM and have Sev. 1 ticket open, but I figured
> to ask here about the warning message we are seeing in GPFS logs.
>
> The cluster is configured as following:
>
> 4 IO servers in the main gpfs cluster
> 700+ compute nodes in the gpfs cluster
>
> home filesystem is slow but projects filesystem seems to be fast. Not many
> waiters on the IO servers (almost none) but a lot of waiters on the remote
> cluster.
>
> The message that is giving us a pause is the following:
> Jul 10 07:05:31 gssio4 mmfs: [N] Writing into file
> /var/mmfs/gen/LastLeaseRequestSent took 10.5 seconds
>
> Why is taking so long to write to to the local file?
>
> Thanks,
> Damir
>
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