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16. 11. 2012 Restarted pnfsd

Thanks for the info!
M.

From: Fabio Martinelli >
Organization: Paul Scherrer Institut
Date: Friday, November 16, 2012 10:28 AM
To: "cms-tier3@lists.psi.ch" >
Cc: Pablo Fernandez >, Miguel Gila >
Subject: Re: pnfsDump error on t3dcachedb01

Hi guys

maybe an experience that can be recycled at CSCS too.

I was searching for a way to get in pause mode dCache because of our pnfsDump error; eventually I ran :

  *   [t3se01.psi.ch] (PoolManager) admin > rc ls                         # to find an idle moment
  *   [t3se01.psi.ch] (PoolManager) admin > rc suspend on -all    # to stop
  *   raised to 16 the shmclients and shmservers and restarted pnfsd
  *   [t3se01.psi.ch] (PoolManager) admin > rc suspend off -all    # to turn it on again
  *   [t3se01.psi.ch] (PoolManager) admin > rc retry * -force-all   # to retry the tens and tens of requests that in the meantime were intentionally suspended

so now I see:
/opt/pnfs/tools/shmcom stat 1122|egrep '^(Client|Server)'
Clients    16
Servers    16

and pnfsDump can go ahead; me with him. Following the pnfsd restart My Nagios can retrieve by SRM a file from each pool, like it usually does. An SRM write worked too.

perhaps it can be a generic trick to use when you want to change something on the fly.

ciao,
Fabio


On 11/15/12 5:41 PM, Fabio Martinelli wrote:
Hi Derek

today during my migration tests I got this error, that according to [1] seems because a little number of shmclients; please do you have experience about that ?

I would augment it but it needs a pnfsd restart;

if you don't then I have to restart pnfs in a moment where the T3 is unused; so far I'm stuck 

in my previous tests it never happened.

ciao,
Fabio

******************

+ /opt/pnfs/tools/pnfsDump -r 000000000000000000001080 -vv -d10 -o chimera /var/CHIMERA_MIGRATION/pnfs.sql -2 -p 0000E0C7D9D3ABCC4B518BDC7B16EE78FFF5 -o verify /var/CHIMERA_MIGRATION/verify.md5 -r -o files /var/CHIMERA_MIGRATION/files.lst -f
Unable to initialise shared-memory interface:
    sclClientOpen:  Unknown(0) (-330)
    shmget: Identifier removed

# /opt/pnfs/tools/shmcom stat 1122|egrep '^(Client|Server)'
Clients    8
Servers    8

# cat /usr/etc/pnfsSetup
shmkey=1122
shmclients=8
shmservers=8
pnfs=/opt/pnfs
...


[1] http://svn.dcache.org/pnfs/trunk/docs/README.pnfsDump

-- FabioMartinelli - 2012-11-16

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