PV-124T shoe shining on PE2950

[Richard Ford]

Can't say sorry.

I run the same PV as you off a PE1800 with Arkeia and it screams....

The only thing I can think of is making sure that the SCSI drivers  
are set correctly - because the PV124T is actually TWO scsi devices.   
One id for the robotic arm and one for the drive.  There is some text  
about this in the manuals for the 124T.

Cheers,
RF.


On 5 Mar 2007, at 8:12 PM, Jesús M. Navarro wrote:

> Hi all:
> I've got a new PE2950 2GB RAM with an Adaptec 39230A which links to  
> a PV124T
> LTO2.  That's the only device on that SCSI chain, since disks  
> (2xRAID1 +
> 4xRAID5) are attached to a PERC5/i.  The operative system is Debian  
> "Etch"
> amd64 (that's the arch for all x86_64 CPUs).
>
> The problem is that I can't make the tape stream, it just shoe  
> shines at about
> 2MB/s.
>
> For instance:
>
> time -p dd if=/dev/zero of=/dev/tapenorewind bs=64k count=16384
>
> This should move data to the tape as fast as possible but the drive  
> seems to
> stream for some three/four seconds then stops for about ten seconds  
> and then
> starts again, so the overall result is being terribly slow (as I  
> said, it
> averages at about 2MB/s).
>
> I tested this both moving zeroes as in the previous example as well  
> as moving
> a 2GB file (a dump image) or data directly from a partition, either  
> with dd,
> dump or tar with exactly same results, so I think it must be some  
> issue
> either with the tape drive itself or some config parameter  
> regarding the
> Adaptec.  Moving data from disk to disk (ie. from the RAID5 array  
> to the
> RAID1) averages a bit over 30MB/s which seems reasonable (while not
> brilliant).  I already upgraded the firmware both for the drive and  
> the tape
> changer just in case.
>
> Any help or ideas?
> -- 
> Jesús M. Navarro
> Jefe de Sistemas y Soporte
> Ándago Ingeniería - www.andago.com
>
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