Re: [Veritas-bu] Netbackup to VTL fast with first tape then slow thereafter
Your initial performance may be misleading because it could be buffered data. I would make sure your tuning is in order; and then I would start investigating how the data is getting to the VTL...ethernet or fibre...what is the hardware in between...we ourselves in one instance discovered a 10 G NIC used by an IBM frame that had a performance bug...a 1 TB backup was taking like 5 hours! Now we have it down to 52 minutes. ...so crazy things can happen. -Original Message- From: veritas-bu-boun...@mailman.eng.auburn.edu [mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of NetCookingTalk Sent: Monday, June 20, 2011 8:14 AM To: VERITAS-BU@MAILMAN.ENG.AUBURN.EDU Subject: [Veritas-bu] Netbackup to VTL fast with first tape then slow thereafter post from Nathan: Thanks, when I checked the bptm logs I can see the throughput but no indicator as to why the second tape crawls. Nathan I've seen some of my jobs start out good and slow to a crawl later. I had not cosidered that it might have changed tape in the process. I will see if that is the case on my end and will be very interested in the solution to this issue. Greg +-- |This was sent by d...@netcookingtalk.com via Backup Central. |Forward SPAM to ab...@backupcentral.com. +-- ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] Netbackup to VTL fast with first tape then slow thereafter
I would try to isolate the problem. Take two new tapes from the VTL. Move them to a new pool Create a test policy that backs up directly to the VTL and fills the two tapes. See if that repeats the behavior of the second tape being. This will tell you whether duplication is involved. If the second tape is slow: expire all images on test tapes with bpexpdate. Repeat the backup. If the problem goes away then the VTL tape is only slow on the first write. If not, you have a different problem. Chris V. On Thu, Jun 9, 2011 at 12:35 PM, nmagsaysay nbu-fo...@backupcentral.comwrote: I'm writing my jobs to VTL then using SLP to get them to LTO5. I've noticed that when i start a job it jumps right up and the speed is 25MB - 40MB then after the tape fills and a second one is loaded the KB/Sec drops to 2MB - 4MB and the speed never raises for subsequent tapes. However when I write directly to LTO5 the jobs average 40MB - 60MB. Using an EMC Clarion VTL. Any advice would be greatly appreciated. Is there a log in NBU that would indicate these write speed fluctuations? Any thoughts would be greatly appreciated. +-- |This was sent by nmagsay...@gmail.com via Backup Central. |Forward SPAM to ab...@backupcentral.com. +-- ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu -- Chris Valenze BlackArrow ch...@batechp.com 410-935-1397 ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] Netbackup to VTL fast with first tape then slow thereafter
Try looking at the BPTM and BPDM logs (T for Tape, D for Disk). I don't know if a VTL will go to TM or DM...I would assume TM since NBU thinks it's a tape still. Sounds fishy since it changes drastically after the second 'tape' is mounted. Have you searched to see if there is a known issue? Rusty Major, MCSE, BCFP, VCS ▪ Sr. Storage Engineer ▪ SunGard Availability Services ▪ 757 N. Eldridge Suite 200, Houston TX 77079 ▪ 281-584-4693 Keeping People and Information Connected® ▪ http://availability.sungard.com/ P Think before you print CONFIDENTIALITY: This e-mail (including any attachments) may contain confidential, proprietary and privileged information, and unauthorized disclosure or use is prohibited. If you received this e-mail in error, please notify the sender and delete this e-mail from your system. nmagsaysay nbu-fo...@backupcentral.com Sent by: veritas-bu-boun...@mailman.eng.auburn.edu 06/09/2011 01:02 PM Please respond to VERITAS-BU@MAILMAN.ENG.AUBURN.EDU To VERITAS-BU@MAILMAN.ENG.AUBURN.EDU cc Subject [Veritas-bu] Netbackup to VTL fast with first tape then slowthereafter I'm writing my jobs to VTL then using SLP to get them to LTO5. I've noticed that when i start a job it jumps right up and the speed is 25MB - 40MB then after the tape fills and a second one is loaded the KB/Sec drops to 2MB - 4MB and the speed never raises for subsequent tapes. However when I write directly to LTO5 the jobs average 40MB - 60MB. Using an EMC Clarion VTL. Any advice would be greatly appreciated. Is there a log in NBU that would indicate these write speed fluctuations? Any thoughts would be greatly appreciated. +-- |This was sent by nmagsay...@gmail.com via Backup Central. |Forward SPAM to ab...@backupcentral.com. +-- ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
