Simon, I won't argue that what you are seeing works for you. It will work, it's just not optimal.
When you optimize your backup performance through the heavy use of multiplexing, you will sacrifice performance on restores. If you can live with that, then fine....go ahead and do it. However, you can get better performance on restores by restoring from a tape that has not been multiplexed. Try it sometime. This part of the equation, by the way, has absolutely nothing to do with the speed of your backbone. --stuart -----Original Message----- From: WEAVER, Simon [mailto:[EMAIL PROTECTED] Sent: Monday, July 31, 2006 12:26 AM To: 'Liddle, Stuart'; 'Mansell, Richard'; veritas-bu@mailman.eng.auburn.edu Subject: RE: [Veritas-bu] Multiplexing Stuart I will believe what "I" have seen, and the restores for the 2 SAN Media Servers are absolutely well within limits of restoring data. We run an extremely fast backbone, so I have no problems with the configuration in place. Regards Simon Weaver 3rd Line Technical Support Windows Domain Administrator EADS Astrium Limited, B23AA IM (DCS) Anchorage Road, Portsmouth, PO3 5PU Email: [EMAIL PROTECTED] -----Original Message----- From: Liddle, Stuart [mailto:[EMAIL PROTECTED] Sent: 31 July 2006 07:59 To: WEAVER, Simon; 'Mansell, Richard'; veritas-bu@mailman.eng.auburn.edu Subject: Re: [Veritas-bu] Multiplexing Simon, Fine....believe what you want....but the numbers don't lie. If you ever try any testing of this you will see that restores are significantly faster when you do them from non-multiplexed tapes. --stuart -----Original Message----- From: WEAVER, Simon [mailto:[EMAIL PROTECTED] Sent: Sunday, July 30, 2006 10:45 PM To: 'Liddle, Stuart'; 'Mansell, Richard'; veritas-bu@mailman.eng.auburn.edu Subject: RE: [Veritas-bu] Multiplexing Stuart Completely disagree - we get the best of both worlds and restores have never been any real issue for us, even large amounts of data across multiple tapes. Regards Simon Weaver 3rd Line Technical Support Windows Domain Administrator EADS Astrium Limited, B23AA IM (DCS) Anchorage Road, Portsmouth, PO3 5PU Email: [EMAIL PROTECTED] -----Original Message----- From: Liddle, Stuart [mailto:[EMAIL PROTECTED] Sent: 28 July 2006 19:37 To: WEAVER, Simon; 'Mansell, Richard'; veritas-bu@mailman.eng.auburn.edu Subject: RE: [Veritas-bu] Multiplexing That's good for backup speeds, but it sucks for restores. Unless all of your clients have really slow network connections, having a high multiplexing value is not really a good idea. You might want to consider dropping the multiplexing down to something like 6. Our configuration uses VTL's to our first backup copy and then I use vault to put it to physical tape. I multiplex to the VTL and single-stream to the physical tapes. Once it is on the physical tape, we have a script that will bpexpdate the copy 1 image on the VTL (this is not an automatic option in NetBackup until version 6.x). When you do a restore from a physical tape, you have a single-stream copy and not one that is multiplexed....this makes for a faster restore. --stuart -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of WEAVER, Simon Sent: Thursday, July 27, 2006 11:22 PM To: 'Mansell, Richard'; veritas-bu@mailman.eng.auburn.edu Subject: Re: [Veritas-bu] Multiplexing Richard Yes I use multiplexing a lot NBU 5.1 Master MP2 + 2 SAN Media Servers 4 drives in a robot - using SSO 1 Storage Unit set to multiplex 25 jobs per drive (Master) 2 SAN Storage Units set to use 2 drives, multiplex 8 per drive Seems to work - get a lot of jobs done - around 300 per night if that helps. Regards Simon Weaver 3rd Line Technical Support Windows Domain Administrator EADS Astrium Limited, B23AA IM (DCS) Anchorage Road, Portsmouth, PO3 5PU Email: [EMAIL PROTECTED] -----Original Message----- From: Mansell, Richard [mailto:[EMAIL PROTECTED] Sent: 27 July 2006 22:31 To: veritas-bu@mailman.eng.auburn.edu Subject: [Veritas-bu] Multiplexing We are struggling to get all of the backups run during the backup window and one of the obvious solutions is to start using multiplexing as the tape drives are not being driven at any where near their maximum throughput. There has been a rather nasty multiplexing problem fixed in 6.0 MP3 but I would be interested to do a straw poll of how many people are using multiplexing and if possible any issues encountered. I would appreciate it if you would respond (off list) as to whether you use multiplexing or not (any version of NetBackup). I will summarise the results and post back to the list. Regards Richard ********************************************************************** This electronic email and any files transmitted with it are intended solely for the use of the individual or entity to whom they are addressed. The views expressed in this message are those of the individual sender and may not necessarily reflect the views of the Christchurch City Council. If you are not the correct recipient of this email please advise the sender and delete. Christchurch City Council http://www.ccc.govt.nz ********************************************************************** _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu This email is for the intended addressee only. If you have received it in error then you must not use, retain, disseminate or otherwise deal with it. Please notify the sender by return email. The views of the author may not necessarily constitute the views of Astrium Limited. Nothing in this email shall bind Astrium Limited in any contract or obligation. Astrium Limited, Registered in England and Wales No. 2449259 Registered Office: Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2AS, England _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu This email is for the intended addressee only. If you have received it in error then you must not use, retain, disseminate or otherwise deal with it. Please notify the sender by return email. The views of the author may not necessarily constitute the views of Astrium Limited. Nothing in this email shall bind Astrium Limited in any contract or obligation. Astrium Limited, Registered in England and Wales No. 2449259 Registered Office: Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2AS, England _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu This email is for the intended addressee only. If you have received it in error then you must not use, retain, disseminate or otherwise deal with it. Please notify the sender by return email. The views of the author may not necessarily constitute the views of Astrium Limited. Nothing in this email shall bind Astrium Limited in any contract or obligation. Astrium Limited, Registered in England and Wales No. 2449259 Registered Office: Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2AS, England _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu