Allen, My only thought - given that you are restoring lots of small files - is that you may be thrashing the target disk. Have you looked at that ?
Ian Smith Oxford England On Monday 03 Aug 2009 5:07 pm, Allen S. Rout wrote: > Howdy, all. > > I've done a decent amount of small-scale online restores from my > offsite virtual volumes, and never been particularly unhappy with the > speed. (though come to think of it I've never timed it either) > > But I'm restoring a pretty big volume now, and it's taking a L-O-N-G > time. I was hoping to elicit war stories from some of you, and see if > my expectations are just out of whack. > > > Environment: Everything is TSM 5.5.3 on AIX. I've got about 350 miles > between primary and secondary site. > > > I regularly get 80 MB/s sustained running tape to tape from primary to > offsite over this link. I've got plenty of TCP buffer space, and I've > set my TCP windows to be 2M on all the servers. > > When I use iperf to check just TCP/IP throughput, I get 800-900Mb > avg. over 30 seconds, with sustained 1Gb plateaus. So the network > level seems reasonable. > > But the restore is rattling around in the vicinity of 2.5 MB/s; just > incredibly slow. > > Now, these are small files; average is just 300K, and most of them are > much smaller (email messages). But the database on the restoring > server isn't thrashing, I don't find any bottlenecks at first look. > > > So. What have you-all seen out of your restores? I really need to > characterise this; It would Not Be Good if this were the best I could > do in a real emergency. > > > - Allen S. Rout
