I seem to be having some jfs write performance issues on a system running Redhat 8.0 with kernel 2.4.20-18.8smp. The kernel update was applied following the initial install. This is a 1 TB filesystem built on an LVM device. The problem seems to ocurr when transferring large files > 1.0 Gb. The iostat utility shows a rate of only around 500 KB/s with momentary short-lived bursts up to around 5000 KB/s.
Could this be caused by fragmentation? It seems that the problem has become more persistent as filesystem utilization has increased. Following shows steps used to create the file system. Any enlightenment would be greatly appreciated. Thanks Created jfs file system. pvcreate -v /dev/sda vgcreate -s 2048 data1vg /dev/sda vgdisplay data1vg --- Volume group --- VG Name data1vg VG Access read/write VG Status available/resizable VG # 0 MAX LV 256 Cur LV 1 Open LV 1 MAX LV Size 2 TB Max PV 256 Cur PV 1 Act PV 1 VG Size 914 GB PE Size 2 GB Total PE 457 Alloc PE / Size 457 / 914 GB Free PE / Size 0 / 0 VG UUID JfkJwi-seIh-HfXq-NYA5-rpMA-2hCh-9y1raS lvcreate -l 457 data1vg -n data1lv mkfs.jfs -L /data1 /dev/data1vg/data1lv mkdir /data1 mount -t jfs /dev/data1vg/data1lv /data1 JD Westerman Unix Systems Engineer _______________________________________________ Jfs-discussion mailing list [EMAIL PROTECTED] http://www-124.ibm.com/developerworks/oss/mailman/listinfo/jfs-discussion
