On Thu, Sep 01, 2011 at 02:36:08AM -0700, frank_sg wrote:
> To get a bigger spool fs, there might be some options:
> 1) What is better: bigger spool fs or faster spool fs? So first option: 3,6
> TB RAID0 with 12 SAS disks direct attatched vs second option: 2 or 3 120 GB
> SSDs?
> 2) Does it make any sense to have a spool fs much bigger than the tape size?
> (LTO4 - 800MB, with compression up to 1,6 TB - so does it make sense to use a
> fs > 1,6 TB?)
> 3) Specially with the SSDs - will I run in problems because of MTBF? Is
> anybody using SSDs for spool fs?
> I have an autoloader with an SAS-LTO4 drive and I would like to get the drive
> to steam as fast as possible.
LTO-4 I have here as well. I experience data rates between 45MB/s and
95MB/s, no use in SAS or SSD, recent SATA would be enough to feed that
as you operate them basically in streaming mode.
We run 30-40 concurrent jobs into the same 1TB spool directory, resided
on a RAID-5 of 4 recent 2 TB SATA2 disks. Limits are the tape drive and
the network, not the disks.
For the right size fo the spool: I set it so big a job never needs to
wait for tape to continue spooling as there are a few very big clients
and a few that are attached via low bandwidth, but I limit a single job
spool to 800GB.
Regards,
Adrian
--
LiHAS - Adrian Reyer - Hessenwiesenstraße 10 - D-70565 Stuttgart
Fon: +49 (7 11) 78 28 50 90 - Fax: +49 (7 11) 78 28 50 91
Mail: lihas AT lihas DOT de - Web: http://lihas.de
Linux, Netzwerke, Consulting & Support - USt-ID: DE 227 816 626 Stuttgart
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