Am 17.04.2012 10:32, schrieb Dave Chinner: >>> What's your storage hardware, application, workload, etc? >> It a Raid 10 of 1TB SATA Drives in front of a 3Ware Controller doing >> heavy rsync backups. > > Hmmm. It sounds like it is just taking a long time for the IO to > complete, not that there is any other problem. If the IO is realy, > really slow, the a log force is definitely a place it coul dstall > for some time. OK as i've seen this just once it just might be that the controller / disks were too slow in this case.
> Does the RAID controller have a BBWC? No but doesn't matter ;-) If it crashes i can just repair the FS and restart the backup again. > What IO scheduler are you using? [root@backup1 ~]# cat /sys/block/sdc/queue/scheduler [noop] deadline cfq > Does mounting with nobarriers reduce the stall time? It is already mounted with nobarrier: /dev/sdc3 on /sdc3 type xfs (rw,noatime,nodiratime,nobarrier,prjquota) > Can you reduce the IO load so that it doesn't end up in this state? Can try that by just doing less backups per time period. Stefan -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
