Veritas-bu

Re: [Veritas-bu] Netbackup to VTL fast with first tape thenslow thereafter

2011-06-14 14:42:42
Subject: Re: [Veritas-bu] Netbackup to VTL fast with first tape thenslow thereafter
From: "Magsaysay, Nathan" <NMagsaysay AT medplus DOT com>
To: Rusty.Major AT sungard DOT com, VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Date: Tue, 14 Jun 2011 14:42:03 -0400

Thanks, when I checked the bptm logs I can see the throughput but no indicator as to why the second tape crawls.

 

Nathan

 

From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Rusty.Major AT sungard DOT com
Sent: Thursday, June 09, 2011 5:44 PM
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Cc: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU; veritas-bu-bounces AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Netbackup to VTL fast with first tape thenslow 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-forum AT backupcentral DOT com>
Sent by: <veritas-bu-bounces AT mailman.eng.auburn DOT edu>

06/09/2011 01:02 PM

Please respond to
<VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU>

To

<VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU>

cc

Subject

[Veritas-bu] Netbackup to VTL fast with first tape then slow        thereafter

 




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 nmagsaysay AT gmail DOT com via Backup Central.
|Forward SPAM to abuse AT backupcentral DOT com.
+----------------------------------------------------------------------


_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu





Confidentiality Notice: The information contained in this electronic transmission is confidential and may be legally privileged. It is intended only for the addressee(s) named above. If you are not an intended recipient, be aware that any disclosure, copying, distribution or use of the information contained in this transmission is prohibited and may be unlawful. If you have received this transmission in error, please notify us by telephone (513) 229-5500 or by email (postmaster AT MedPlus DOT com). After replying, please erase it from your computer system.

_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu