Il 01/09/2011 11:36, frank_sg ha scritto:
> Hi,
>
> I am doing some tests about spooling. I have created a spool filesystem for 
> testing purposes. I decided to try a quiet small one - just 10 GB. Well, I 
> get an ugly perfomance (<10MB/s) with this one. So I assume that the spool 
> file system is too small - is this assumption right?
>
> 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.
>
> Thanks for you answers!
> Regards,
> Frank
>
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I almost forgot: the spool filesystem must be able to provide a 
sustained transfer rate a little greater than the nominal tape write 
rate, otherwise the benefits of spooling on tape wear will be lost due 
to the tape having to stop to wait for data from spool area.

HTH.

-- 
Marcello Romani

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