Hi all,

I've in /var/log/message of a diskserver machine the following messages:

Jan 30 02:00:00 sta08 pidof[30779]: can't read sid for pid 30771
Jan 30 02:45:00 sta08 pidof[30990]: can't read sid for pid 30987
Jan 30 15:15:00 sta08 pidof[2134]: can't read sid for pid 2135
Jan 31 09:45:01 sta08 pidof[7500]: can't read sid for pid 7487
Jan 31 10:00:00 sta08 pidof[7560]: can't read sid for pid 7549

[root@sta08 root]# uname -a
Linux sta08.cr.cnaf.infn.it 2.4.21-27.0.2.ELSDRsmp #1 SMP Wed Mar 16 10:45:47 CST 2005 i686 i686 i386 GNU/Linux
[root@sta08 root]#

The distribution is a RedHatE 3 based:
[root@sta08 root]# cat /etc/issue
Scientific Linux CERN Release 3.0.4 (SL)
[root@sta08 root]#


It appears that the load avarege grows up to 100 process and the access fail rate grows up as well.

Please, can you give some explanation of this behaviour and clarify the meaning of "can't read sid for pid" message.


Thanks a lot in advance, Arm74

A sid is a string id and a pid is a process id so from what I gather here the string id cannot be read from the process that is running on that id. Find out what process is being run on those id's and this might help and tracking it down. From what little searching I did online it looks like only red hat has this particular error message so it must be something specific to that distribution of Linux.