Hello, Due to a major power restructuring we had to shutdown our GFS cluster at Saturday. Since then we have been suffering a serious performance degradation. Previously system load was usually less than 1, in spikes 3-4. Yesterday we had 180(!), without no apparent reason: network interfaces are OK (settings just right, no error/packet loss), no settings modified, usage of the cluster did not change. GFS is over AoE: the Coraid boxes are just fine, no RAID degradation. At starting up, ntpd on some systems could not set the system clock as it was off by more than 180s. We fixed that, rebooted the systems one by one just in case, helped nothing. What is more strange, when the init script issues the command gfs_tool settune /gfs/home statfs_fast 1 it takes quite a lot of time, around 15-20s. What could go wrong, on a nicely working system? Might there be filesystem inconsistencies, which can produce such slowdown and we should run gfs_fsck? The gfs parameters which are tuned: statfs_slots 128 statfs_fast 1 demote_secs 30 glock_purge 50 scand_secs 3 [This one was added today.] Any idea can be useful. Best regards, Jzosef -- E-mail : kadlec@xxxxxxxxxxxx, kadlec@xxxxxxxxxxxxxxxxx PGP key: http://www.kfki.hu/~kadlec/pgp_public_key.txt Address: KFKI Research Institute for Particle and Nuclear Physics H-1525 Budapest 114, POB. 49, Hungary -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
