Poor Aux Copy performance
they show to be 100% fragmented, ran defrag on them, but never finishes, defrag engine loose communication. I have opened ticket Microsoft on the defrag issue.
I also ran defrag on our small data centers 10-13TB disk libraries, same NX3100 NAS with 7200RPM drives, they got the same lost communication with Defrag engine after running for days, 1 still defrag successfully to where it was only 4% fragmented, but no change in speed from disk to tape.
From: Luke <kaneda.san.sec < at > gmail.com>
To: commvault < at > yahoogroups.com
Sent: Monday, August 15, 2011 4:14 PM
Subject: Re: [commvault] Poor Aux Copy performance
Out of curiosity... how fragmented are those maglib volumes?
Also with your aux copy from dedupe disk to tape, have you tried setting Combine to streams to match the number of tape drives you want to use and then enabling multiplexing factor of 2 or 4?
Luke
On 12 August 2011 04:51, Robert Murphy <luparguru < at > yahoo.com ([email]luparguru < at > yahoo.com[/email])> wrote:
Already have, 110802-000063
They have me trying to defrag NAS and then run another AUX copy, but defrag is taking a very long time and Win 2008 defrag tool does not show status of how long it will take or how much completed, just shows running, even in cmd line mode
From: Rajiv Kottomtharayil <sukumara < at > commvault.com ([email]sukumara < at > commvault.com[/email])>
To: "commvault < at > yahoogroups.com ([email]commvault < at > yahoogroups.com[/email])" <commvault < at > yahoogroups.com ([email]commvault < at > yahoogroups.com[/email])>
Sent: Thursday, August 4, 2011 10:23 AM
Subject: RE: [commvault] Poor Aux Copy performance
Can you escalate a ticket to commvault support. This does not look normal.
From: commvault < at > yahoogroups.com ([email]commvault < at > yahoogroups.com[/email]) [mailto:commvault < at > yahoogroups.com ([email]commvault < at > yahoogroups.com[/email])]
On Behalf Of luparguru
Sent: Thursday, August 04, 2011 10:43 AM
To: commvault < at > yahoogroups.com ([email]commvault < at > yahoogroups.com[/email])
Subject: [commvault] Poor Aux Copy performance
Running CommVault 9.0 SP3
Doing dedup to primary stg which is DELL NX3100 with 2TB 7200RPM SAS drives.
Have an IBM 3100 with 6 LTO4 drives fiber connect via 4GB switch to the Dell NAS.
When doing Aux Copy to tape, getting about 7MB to 25MB per a sec per a drive, now I understand according to CommVault there is suppose to be a 10 to 15% performance hit when using dedup, but doing backups of that same data on same hardware at a non dedup format and then doing aux copy to tape I get 69MB to 80MB per a sec. The difference is a lot more than a 10 to 15% performance hit, anyone else having this issue?
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