RAID 5 on SUSE LINUX 9.3 - Strange activity every 12 hours
Posted on 2006-11-08
I am having a problem with a RAID 5 array on SUSE Linux 9.3.
The server is a Dell Poweredge 2850 with a LSI Logic Controller PERC 4e/Di .
This server is used for storage and at this moment it holds up to 300.000 small files.
The server is doing alot of reads but no so many writes. Every 12 hours (or so) the system is running very slow for about 30 minutes, during this time the cpu is up to 70% average and the hard drives are running at full throttle.
This is the following server configuration: 2 Xeon CPU 64bit, 1 TB of storage SCSI drives, Suse Linux 9.3 updated, java 1.5.0, apache tomcat.
Usually the average server load is about 4% of CPU Time, but every 12 hours those strange spikes appears but nothing changes in the process list.
The disks are reiserfs and were mounted acl, user_xattr.
I also tried to mount them with noatime, data=journal, acl, user_xattr but nothing changed.
I have the same software configuration on another server but the difference is that there is no RAID on that one - it is running flawlessly.
Thank you in advance for your help.