Veritas-bu

Re: [Veritas-bu] Spam: NBU 6 Tuning for Small Files Backup

2007-06-13 03:45:09
Subject: Re: [Veritas-bu] Spam: NBU 6 Tuning for Small Files Backup
From: "Khurram Tariq" <khurramtm AT gmail DOT com>
To: veritas-bu AT mailman.eng.auburn DOT edu
Date: Wed, 13 Jun 2007 12:32:59 +0500
The file sizes are 1KB to 4MB and are in hundreds of thousands totaling to ~400GB most of the time.

On 6/13/07, WEAVER, Simon (external) < simon.weaver AT astrium.eads DOT net> wrote:
what sort of files are they? We have a SAN Media Server, via fibre, with NBU 5.1 via LTO3 Tapes and get good throughput.
 
Its a Windows box though! But does the job - used to take 42 hours, but now down to 16 hours - approx 4TB - huge mix and match of file sizes. from 2kb to 1mb !
 
No tuning was done, no flashback was implemented.
 
 

Regards

Simon Weaver
3rd Line Technical Support
Windows Domain Administrator

EADS Astrium Limited, B23AA IM (DCS)
Anchorage Road, Portsmouth, PO3 5PU

Email: Simon.Weaver AT Astrium.eads DOT net

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Wilkinson, Tim
Sent: 13 June 2007 05:38
To: Khurram Tariq; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Spam: NBU 6 Tuning for Small Files Backup

Khurram,
 
Flashbackup will improve the performance (it caches the data as a sort of snapshot then backs-up the snapshot so it's like a large file rather than loads of small ones, or something like that....) but because it works per volume, you need the space for the cache, which is at least the same size as the volume you are backing-up.
 
It will improve performance for loads of small files but probably won't help too much if they are on a huge volume and they take up a small % of the space.
 
Cheers,
 
Tim


From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Khurram Tariq
Sent: Tuesday, 12 June 2007 6:07 PM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Spam: [Veritas-bu] NBU 6 Tuning for Small Files Backup

Hi All,

We have just migrated to a NBU 6 SAN based environment. We have a server with a large number of small files (100k to 4MB) and its performing quite poorly on SAN based backup (5MB per stream). Can anyone advise some tuning parameters to  improve this speed? The library is L500 with FC LTO3 drives.

Regards,
Khurram

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