I used a similar setup before going to LTO4. I used CentOS5 with HP servers and
HP LSI drivers. As I recall I did get higher speed negotiations, but the drives
themselves have a max speed uncompressed of 25MBs as I recall. I had one drive
per channel and would see bursts of 30-40 MBs per drive in networker.
On Apr 26, 2010, at 3:22 AM, Voetelink D. wrote:
> Hi,
>
> We have two Qualstar tapelibraries with each 2 or 3 SAIT-1 (SDZ-100) drives.
> They are connected to HP Proliant servers running Red Hat Enterprise Linux 3
> and 4.
>
> For a long time I've had speed problems with the tapedrives. I could not
> get more then ~ 36MB/s per channel. I've worked around this by spreading
> the tapedrives over different SCSI HBA's, but now I finally found some
> time to look into this problem.
>
> The devices are connected to LSI Fusion HBA's, which should be able to
> connect at 320MB/s ultra wide. The drives should have ultra 160 wide
> SCSI interfaces.
>
> After some searching on the Internet I found the 'lsiutil' Linux software
> with which I could finally see at which speed and width the devices are
> connected, and I was very surprised that the devices had negotiated 'Ultra2
> Narrow, 40 MB/sec'.
> I verified this on all devices in both systems, and all tapedrives are
> connected at that speed....
>
> I cannot find any settings within the LSI BIOS which can change this,
> and also within the lsiutil software I cannot find any options....
>
> I've installed the latest available LSI driver for Red Hat Enterprise
> Linux 4, but this changed nothing.
>
> Does anyone have an idea on how to make the devices run at ultra 160 wide?
>
> Thanks,
>
> Dennis
>
>
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