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Re: Ultrium tapetype
2006-03-15 09:50:22
On Wed, 15 Mar 2006 at 8:40am, Graeme Humphries wrote
Joshua Baker-LePain wrote:
FYI, I found that I got faster speeds with LTO3 by using larger than
the default blocksize of 32KB. My nightly amanda backups get ~70MB/s
using 2MB blocks.
Hrm... I'm not being tapespeed limited (yet), but where do you configure
the blocksize in Amanda?
Well, you have to be careful with LTO3. You want to feed the tape at at
least 1/2 native speed (native speed is rated to be 80MB/s). Slower than
that, and the drive will have to start and stop the tape frequently (aka
shoe-shining), which is bad for both tapes and the drive (and capacity,
for that matter). This generally means actually putting some thought/$$
into the backup server's disk system.
For amdump and friends, blocksize is set in the tapetype. For amtapetype,
you can set it on the command line. 'man amanda.conf' and 'man
amtapetype' are your friends.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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