Good-day Charles,

We also had  some difficulties on a site with the Overland Neo2000.

I am happy to say these were finally resolved.

The site uses NW for Linux on the backup server and has used various SCSI
HBA's including the 29160.

The site firstly used a Neo2000 with DLT8000 drives (LVD-SCSI) which worked
fine (by all acounts).

However, the final decision was for SDLT technology, and this is where the
problems began.

The new Neo with SDLT (LVD-SCSI) drives behaved most erratically and
unpredictably.

It was clearly a SCSI-type problem,  but nothing we could do would resolve
it.

New HBA's, cables, terminators, even tape drives did not help.

The problem was more one of SCSI hangups than simply low throughput like you
are seeing.

But you might have ended up with the SCSI bus having negotiated it's
clockspeed all the way down to 1.5 Mhz.

Finally it was isolated to the small SCSI pass-through circuit boards in the
back of the Neo.

These actually hold the SCSI plugs to which the SCSI cables are attached
(they are more complex than they appear at first)

Apparently, this was a known problem, and Overland shipped out new ones.

This may be relevant in your case.  However, it goes back at least 6 months.

I would be surprised if this is a new library, supplied with these
problematic parts.

regards,

John Hope-Bailie

Source Consulting.

> -----Original Message-----
> From: Charles Walther [mailto:CWalther AT SAROFIM DOT COM]
> Sent: 23 October 2002 05:17
> To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
> Subject: [Networker] Terrible performance with Overland Data NEO2000
>
>
> NW 6.1.1 for NT
> Windows 2000
> Compaq Proliant DL580 w/Dual Xeon 900 mhz processors and 5GB ram
> Adaptec 29160 SCSI Controller
>
> We just installed an overland data NEO2000.  When our backup
> groups kicked
> off, we are only getting 1600KB/s on the first drive and when
> the 2nd kicks
> off it drops down to 800KB/s for each drive.  We can't seem
> to get any more
> throughput than this on either local backups or over the
> network.  It's not
> a network issue,  gigabit connection.  We can unplug the
> overland and plug
> in our Exabyte and get 10-15 MBps throughput.
>
>
> Any ideas ?   Overland says it must be SCSI related.
>
> Please help,
>
> Charlie Walher
>
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