----- Original Message ----- | Hello - | | We are experiencing extreme I/O slowness on a gfs2 volume on a SAN. | | We have a: | | Netezza TF24 | IBM V7000 SAN | IBM Bladecenter with 3 HS22 blades | Stand alone HP DL380 G7 server | | | The 3 blades and the HP DL380 are clustered using RHEL 6.1 and | clustersuite 5.5. | | We have 2 clustered volumes on different storage pools (one has 10k | drives the other 7.2k). | | We have an internal test that reads a large file (950G) using fopen | and | memmap. On a standalone server in a datacenter (Ubuntu Raid 5 10k | disks) | the tests take approximately 75seconds to run. | | On the blades the test takes 300 - 350 seconds. | | I have been looking at the cluster conf; any gfs tuning I can find. I | am | not really sure what I should post here? | | yrs | | Michael | | -- | | | Michael Bubb | System Administrator Hi Michael, It sounds like you probably ran into our "Large File Allocate" bug. This is solved in recent kernels, including 5.7.z, 5.8, 6.3, etc. More info here: https://bugzilla.redhat.com/show_bug.cgi?id=683155 Regards, Bob Peterson Red Hat File Systems -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
