[Labs-l] [REMINDER] Filesystem downtime today

[Marc A. Pelletier]

[Crossposted to Wikitech-l]

Hello, all!

As a reminder, the planned partial downtime of the Labs network 
filesystem for maintenance is today (January 15) at 18:00 UTC and is 
scheduled to last up to 24 hours - but I have high hopes that it will be 
much shorter than that.

In addition to the expected impact during the window (copied below) 
there will be a brief (less than 5 minutes) complete suspension of 
service to the affected filesystems at the very beginning of the process 
that should not cause errors but may cause many services to stall briefly.

-- Marc

On 14-12-31 12:11 PM, Marc A. Pelletier wrote:
> The expecte impacts is:
>
> * Starting at the beginning of the window, /home and /data/project will
> switch to readonly mode; any attempt to write to files to those trees
> will result in EROFS errors being thrown.  Reading from those
> filesystems will still work as expected, so would writing to other
> filesystems;
> * Read performance may degrade noticably as the disk subsystem will be
> loaded to capacity;
> * It will not be possible to manipulate the gridengine queue -
> specifically, starting or stopping jobs will not work; and
> * At the end of the window, when the operation is complete, the "old"
> file system will go away and be replaced by the new one - this will
> cause any access to files or directories that were previously opened
> (including working directories) on the affected filesystems to error out
> with ESTALE.  Reopening files by name will access the new copy identical
> to the one at the time the filesystems became readonly.