I have a problem with slow file transfers. It's not really related to dirvish, except that the file transfer which are affected are those done when making backups. But I'm hoping that people here might be able to point me in the right direction.
I have a server that makes backups of its primary data volume in a backup volume. The backups take a long time and I'm trying to work out why. I ran a dirvish --init that created a 439 GB vault and it took 11 hours. That's just 11.34 MB/s so I ran some more tests. The system was essentially idle. Some basic parameters for the two filesystems and two others that are involved in my tests are: data 2.0 TB, xfs, part of 4 disk md RAID10 backup 1.2 TB, reiserfs, part of 3 disk 3ware 9650SE RAID5 root 9.7 GB, ext4, sdc1* primary partition test+ 9.7 GB, ext2, sdf3 primary partition disk otherwise unused The disks are all 1.5 TB SATA drives; a mix of Seagate and WD * sdc1 is the root partition whilst sdc2 is part of the mdadm RAID (less than optimal, I know) + sdf3 is an otherwise unused partition just for testing I measured the disk speeds with hdparm: # hdparm -tT /dev/mapper/vg--backup-lv--storage 207.82 MB/s # hdparm -tT /dev/mapper/vg--storage-lv--data 103.50 MB/s # hdparm -tT /dev/sdc 124.36 MB/s # hdparm -tT /dev/sdf 92.34 MB/s I copied an 8 GB file from one place to another with cp and timed the command: data -> backup 11.84 MB/s data -> sdf3 78.54 MB/s sdf3 -> data 77.06 MB/s backup -> data 143.30 MB/s sdf3 -> backup 12.05 MB/s backup -> sdf3 82.50 MB/s So everything is understandable except writing to backup. Does anybody have any thoughts on whether this is to be expected, or a problem with the filesystem or hardware or ... ? Thanks, Dave _______________________________________________ Dirvish mailing list [email protected] http://www.dirvish.org/mailman/listinfo/dirvish
