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
