PV-124T shoe shining on PE2950

[Richard Ford]

I also have same scsi card and OS revision...


On 5 Mar 2007, at 11:47 PM, Richard Ford wrote:

> 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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