Re: Slow writing speed on LTO4 SAS tape

Just a thought:

How fast can you read from the source ?


> I have a LTO4 SAS tape that's supposed to write at 120 MBytes/s, yet all
> I can get it barely 20something MBytes/s.  Tried all the writing
> methods:
> tar --create --file /dev/st0
> cat file > /dev/st0
> dd if=file of=/dev/st0 bs=1M
>
> The best speed is with dd, around 27 MBytes/s
>
> The SAS controller is Dell PERC 5/E,
> 0000:0d:08.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068
> PCI-X Fusion-MPT SAS (rev 01)
>
> The OS is SLES9SP4+updates.
> I also tried booting with a LiveCD of openSUSE 11.2 and Mandriva 2010,
> the writing speed is the same.
>
> Next step is testing the drive on a different server.
>
> Does anyone have any idea what could be the cause of the slowness?
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>


Martin Berg

Martin Berg Consult ApS
mobile: +45 30 35 58 68
web: www.berg-consult.com

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