Aux Copy - Combine Source Data Streams & Multiplexing?
2 concepts here
1. Multiplexing during backup to Tape: Allows multiple jobs or streams of a job to go to the same tape. Auxcopy from this tape will read multiplexed data and write it out as is.
2. Multiplexing during auxcopy: Ability to take multiple streams of source copy and write to same copy on tape. This is best used with combine streams. So instead of combining to 1 stream you can combine to n streams but limit to one tape by using multiplexing. Works better as we will use multiple readers in this case. If you simply combine to one stream on destination, only one reader is used at a time and hence auxcopy performance may be less than a multiple read auxcopy.
On Jan 22, 2012, at 8:36 AM, Paul Hutchings wrote:
Thanks Rajiv, little confused by that though? If doing an aux copy to a single tape drive I have to set "combine to X streams" to 1 stream.
Should I typically set multiplexing though? Right now it's set to 4 which seems to work quite nicely.
Maybe it's trial and error but I assume at some point performance will drop?
From: commvault < at > yahoogroups.com ([email]commvault < at > yahoogroups.com[/email]) [commvault < at > yahoogroups.com ([email]commvault < at > yahoogroups.com[/email])] on behalf of Rajiv Kottomtharayil [sukumara < at > commvault.com ([email]sukumara < at > commvault.com[/email])]
Sent: 22 January 2012 12:55 PM
To: commvault < at > yahoogroups.com ([email]commvault < at > yahoogroups.com[/email])
Subject: Re: [commvault] Aux Copy - Combine Source Data Streams & Multiplexing?
Auxcopy does not demultiplex the data by default. So no impact on copy speeds.
On Jan 22, 2012, at 6:54 AM, Paul Hutchings wrote:
Is there a best practise on this when trying to optimize aux copy performance?
I know the downside of multiplexing is if you need to restore from tape, but in terms of doing the aux copy to tape, is there a recommended multiplex value or a rule to use to determine the value to use?
Thanks,
Paul
MIRA Ltd
Watling Street, Nuneaton, Warwickshire, CV10 0TU, England
Registered in England and Wales No. 402570
VAT Registration GB 100 1464 84
The contents of this e-mail are confidential and are solely for the use of the intended recipient. If you receive this e-mail in error, please delete it and notify us either by e-mail, telephone or fax. You should not copy, forward or otherwise disclose the content of the e-mail as this is prohibited.
***************************Legal Disclaimer***************************
"This communication may contain confidential and privileged material for the
sole use of the intended recipient. Any unauthorized review, use or distribution
by others is strictly prohibited. If you have received the message in error,
please advise the sender by reply email and delete the message. Thank you."
**********************************************************************
__._,_.___
Reply to sender ([email]sukumara < at > commvault.com?subject=Re%3A%20%5Bcommvault%5D%20Aux%20Copy%20-%20Combine%20Source%20Data%20Streams%20%26%20Multiplexing%3F[/email]) | Reply to group ([email]commvault < at > yahoogroups.com?subject=Re%3A%20%5Bcommvault%5D%20Aux%20Copy%20-%20Combine%20Source%20Data%20Streams%20%26%20Multiplexing%3F[/email]) |
Reply via web post |
Start a New Topic
Messages in this topic (4)
Recent Activity:
Visit Your Group
Commvault Documentation here:
http://documentation.commvault.com/
Text-Only ([email]commvault-traditional < at > yahoogroups.com?subject=Change Delivery Format: Traditional[/email]), Daily Digest ([email]commvault-digest < at > yahoogroups.com?subject=Email Delivery: Digest[/email]) • Unsubscribe ([email]commvault-unsubscribe < at > yahoogroups.com?subject=Unsubscribe[/email]) •
Terms of Use
.
[img]http://geo.yahoo.com/serv?s=97359714/grpId=7450851/grpspId=1707277520/msgId=5447/stime=1327276792/nc1=4025291/nc2=4507179/nc3=5758222[/img]
__,_._,___
