I'm doing amvault from disk to tape the workload on the server is the same no shortage of memory cpu resources. Xfer rate to tape reduced by 60% from version 3.2.0 to 3.3.7 !
-----Ursprungligt meddelande----- Från: [email protected] [mailto:[email protected]] För Jean-Francois Malouin Skickat: den 3 september 2015 21:37 Till: [email protected] Ämne: Re: Tape write rate much slower efter upgrade Hi, * Jean-Louis Martineau <[email protected]> [20150903 15:21]: > Gunnar, > > Do the number by DLE always differ? > Are you using a holding disk? > Can you monitor the server to find some bottleneck, memory, cpu, > network, disk I/O, ... I witnessed the same behaviour back in February when upgrading from 3.3.5 to 3.3.7. I tried to post to the list a few times but somehow my posts never made it, maybe because they had 2 pics attached showing the performance from the hold disk to the tape drive. Here's what I wrote back then: "2 weeks ago I upgraded one of my amanda server from 3.3.5 to 3.3.7. Right away I noticed a ~25% tape write performance degradation to a LTO4 tape drive. I've attached 2 pics showing the xfer IO rate to/from the holddisk: one shows a snapshot of the week after the upgrade with the 10th of Feb still at 3.3.5 (and a xfer rate of ~100MBs) and a drop to ~75MBs after the upgrade was done. I reverted back to 3.3.5 a few days ago and the 2nd snapshot shows a return to previous rate." HTH, jf > > Jean-Louis > > On 03/09/15 02:49 PM, Gunnarsson, Gunnar wrote: > > > >Hi, > > > >See below slow down in avg tp write rate after having upgraded amanda > >from 3.2.0 to 3.3.7p1 nothing else is changed. > > > >We are using DLT drivers SCSI and fiber connected. > > > >Thanks Gunnar > > > >Tape Time (hrs:min) 2:37 2:37 0:00 > > > >Tape Size (meg) 382968.9 382968.9 0.0 > > > >Tape Used (%) 324.1 324.1 0.0 > > > >DLEs Taped 462 462 0 > > > >Parts Taped 462 462 0 > > > >Avg Tp Write Rate (k/s) 41670.4 41670.4 -- > > > >(brought to you by Amanda version 3.2.0) > > > >Tape Time (hrs:min) 4:18 4:18 0:00 > > > >Tape Size (meg) 384525.8 384525.8 0.0 > > > >Tape Used (%) 334.0 334.0 0.0 > > > >DLEs Taped 481 481 0 > > > >Parts Taped 481 481 0 > > > >Avg Tp Write Rate (k/s) 25469.2 25469.2 -- > > > >(brought to you by Amanda version 3.3.7p1) > > > >Tape Time (hrs:min) 6:03 1:46 4:18 > > > >Tape Size (meg) 710405.4 208727.0 501678.5 > > > >Tape Used (%) 161.0 47.4 113.6 > > > >DLEs Taped 12 4 8 1:7 2:1 > > > >Parts Taped 27 8 19 1:11 2:8 > > > >Avg Tp Write Rate (k/s) 33357.3 33701.7 33216.0 > > > >USAGE BY TAPE: > > > > Label Time Size % DLEs Parts > > > > Orabck-Unix-002 3:37 431135M 92.5 11 19 > > > > Orabck-Unix-003 2:25 279270M 59.9 1 8 > > > >(brought to you by Amanda version 3.3.7p1) > > > >Tape Time (hrs:min) 3:13 0:11 3:01 > > > >Tape Size (meg) 776730.9 50668.0 726062.8 > > > >Tape Used (%) 177.9 12.6 165.3 > > > >DLEs Taped 18 4 14 1:9 2:5 > > > >Parts Taped 33 4 29 1:11 2:18 > > > >Avg Tp Write Rate (k/s) 68857.4 77438.9 68329.0 > > > >USAGE BY TAPE: > > > > Label Time Size % DLEs Parts > > > > Orabck-Unix-015 1:34 392152M 84.2 4 12 > > > > Orabck-Unix-016 1:34 384579M 82.5 14 21 > > > >(brought to you by Amanda version 3.2.0) > > >
