Veritas-bu

[Veritas-bu] LTO3 Drive Speed Poll

2006-07-18 22:16:25
Subject: [Veritas-bu] LTO3 Drive Speed Poll
From: tim.berger at gmail.com (Tim Berger)
Date: Tue, 18 Jul 2006 19:16:25 -0700
On 7/11/06, Justin Piszcz <jpiszcz at lucidpixels.com> wrote:
>
>
> What speeds have other members gotten when doing speed testing to LTO3
> drives?
>
> Justin.


With real-world data, netbackup is reporting from 6MB/sec ( this does not
seem right) to about 143.5MB/sec with 2GB fragments over a sample of 1572
fragments for the past 15 days.  Average performance is 78.5MB/sec.  These
are directly connected IBM LTO3 drives to linux systems using Qlogic
2322's.  Most of our backups fall in the 80 to 125MB/sec range.

Creating  /usr/openv/netbackup/NET_BUFFER_SZ with a reasonable value seems
to have helped us a lot even though its just going from staging to tape.

-- 
-Tim
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