[Veritas-bu] LTO-4 on Linux
Folks, Has anybody out there configured LTO-4 drives on Linux Red Hat ES 4? I recently swapped out a pair of LTO-2 drives for LTO-4 drives on a v5.1 Media Server and have seen no throughput performance improvement. I did the same test on a Windows 2003 Server using the same data and saw significant improvement, but the Windows OS has a specific driver for the LTO-4. Linux uses the mt driver, but I can't see anything on the web specifically about tuning the mt driver for LTO-4. Regards, Paul Esson Redstor Limited Direct: +44 (0) 1224 595381 Mobile: +44 (0) 7766 906514 E-Mail: [EMAIL PROTECTED] Web:www.redstor.com REDSTOR LIMITED Torridon House 73-75 Regent Quay Aberdeen UK AB11 5AR Disclaimer: The information included in this e-mail is of a confidential nature and is intended only for the addressee. If you are not the intended addressee, any disclosure, copying or distribution by you is prohibited and may be unlawful. Disclosure to any party other than the addressee, whether inadvertent or otherwise is not intended to waive privilege or confidentiality. ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] LTO-4 on Linux
Did you up your NBU buffer settings to account for the increased performance of LTO-4? You can check this technote to determine which settings to check and if your media server has enough resources to push these upgraded drives: http://seer.entsupport.symantec.com/docs/183702.htm I've heard that 1MB is useful for the buffer size (1048576) but you'll need to test to really nail it down. From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Esson, Paul Sent: Wednesday, April 09, 2008 09:43 To: veritas-bu@mailman.eng.auburn.edu Subject: [Veritas-bu] LTO-4 on Linux Folks, Has anybody out there configured LTO-4 drives on Linux Red Hat ES 4? I recently swapped out a pair of LTO-2 drives for LTO-4 drives on a v5.1 Media Server and have seen no throughput performance improvement. I did the same test on a Windows 2003 Server using the same data and saw significant improvement, but the Windows OS has a specific driver for the LTO-4. Linux uses the mt driver, but I can't see anything on the web specifically about tuning the mt driver for LTO-4. Regards, Paul Esson Redstor Limited Direct: +44 (0) 1224 595381 Mobile: +44 (0) 7766 906514 E-Mail: [EMAIL PROTECTED] Web:www.redstor.com REDSTOR LIMITED Torridon House 73-75 Regent Quay Aberdeen UK AB11 5AR Disclaimer: The information included in this e-mail is of a confidential nature and is intended only for the addressee. If you are not the intended addressee, any disclosure, copying or distribution by you is prohibited and may be unlawful. Disclosure to any party other than the addressee, whether inadvertent or otherwise is not intended to waive privilege or confidentiality. ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
Re: [Veritas-bu] LTO-4 on Linux
On Wed, Apr 9, 2008 at 12:43 PM, Esson, Paul [EMAIL PROTECTED] wrote: I recently swapped out a pair of LTO-2 drives for LTO-4 drives on a v5.1 Media Server and have seen no throughput performance improvement. Were the tape drives the bottleneck before? If not - and for most users, the tape drive is *NOT* the bottleneck - then replacing the drive with an LTO-4 certainly won't speed things up and could even slow it down since the tape drive will shoe-shine more now than before. ** What evidence have you gathered to prove that the drives were the bottleneck? .../Ed -- Ed Wilts, Mounds View, MN, USA mailto:[EMAIL PROTECTED] ___ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
