This is a strange one. I have a home server (Pentium Core 2, Intel ICH10, 1G RAM, 2x SATA 1TByte disks in Raid1, 1x 2TByte SATA and 1 x 1TByte SATA). This is used for normal NFS and MythTv usage as well as httpd, network routing openvpn etc. It has been running for about 2 years and 1 year under Fedora12 with no issues. I have recently updated it to Fedora14 and updated the disks to the above configuration (Was 3 x 320G SATA in Raid5 + 2x 1TByte SATA). Generally all works fine, but the system has recently started going into a a running very very slow mode. Once running slow it can take 5mins to login on an NFS mounted client. Running commands through a ssh take an age. Top reports low CPU usage (< 5% but the wait time is above 80%). There is obviously an issue with disk IO and processes being locked out of disk access for large periods. Rebooting does not normally clear the issue but sometimes does. There do not appear to be any processes doing large amounts of disk IO, ksysguard reports low disk IO bandwidth in use. I have killed off most of the processes when the system was running slow with no real effect. When the problem occurs the Disk I/O is very very slow, normally "hdparam -t /dev/sd..." gives around 90MBytes/sec. When in slow mode it can be as low as 2MBytes/sec. Disk I/O tests as the ext4 file system level are just the same (writes being even worse). This slowness applies to all of the disks most of which are not being accessed otherwise. A yum update (on a reasonably fast Internet link) took 6 hours (should have been more like 10 mins). There are no messages in /var/log/messages or from dmesg. It is also intermittent. I have rebooted it a few times, sometimes when it comes up it is fine, and other times it is not. The two main RAID1 disks are WD10EARS (Green). I have seen reported some issues with the performance of these but in my case they appear to work fine when the system is running ok. Also the system has a WD10EVD disk and this also goes slow when the problem occurs. This is with kernel 2.6.35.9-64.fc14.i686.PAE. I tried installing 2.6.35.6-48.fc14.i686.PAE and booted with that and all was fine, however when I went back to 2.6.35.9-64.fc14.i686.PAE it was still fine. I will run with 2.6.35.6-48.fc14.i686.PAE for a while and see if the problem re-occurs with that kernel. Anyone seen this sort of behaviour before ? Any ideas one where to look ? Cheers Terry -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
