...also check firmware on the STK drives and any other STK devices (such as
the scsi router). This was once a problem with drives falling oss the SAN.
-----Original Message-----
From: Davina Treiber [mailto:treiber AT HOTPOP DOT COM]
Sent: Monday, March 03, 2003 12:10 PM
To: NETWORKER AT LISTMAIL.TEMPLE DOT EDU
Subject: Re: [Networker] Unknown error 21 drive 9840
On Fri, 28 Feb 2003 10:57:28 +0100, Girot, Jean-Pierre <Jean-
Pierre.Girot AT FR.MTI DOT COM> wrote:
>the configuration that I have is one Networker server and four Storage
Node in NetWorker 6.1.3 that share a library STKL700 with four drives STK
9840.
>We obtain the error message below:
>
>02/21/2003 04:02:43 AM nsrd: media warning: rd=frdpgpfsapqd1:\\.\Tape1
writing: unknown error 21 (0x15), at file 93 record 2755
>02/21/2003 04:02:43 AM nsrd: media notice: 9840 tape WF0342 on
rd=frdpgpfsapqd1:\\.\Tape1 is full
>02/21/2003 04:02:43 AM nsrd: media notice: 9840 tape WF0342 used 70 GB of
20 GB capacity
>
>02/21/2003 10:21:29 PM nsrd: media warning: rd=frdpgpfsapsn01:\\.\Tape0
writing: unknown error 21 (0x15), at file 230 record 3349
>02/21/2003 10:21:29 PM nsrd: media notice: 9840 tape 000556 on
rd=frdpgpfsapsn01:\\.\Tape0 is full
>02/21/2003 10:21:29 PM nsrd: media notice: 9840 tape 000556 used 125 GB of
20 GB capacity
>
>10:26:28 PM nsrd: media warning: rd=frdpgpfsapsn01:\\.\Tape2 writing:
unknown error 21 (0x15), at file 61 record 945
>02/21/2003 10:26:29 PM nsrd: media notice: 9840 tape 000554 on
rd=frdpgpfsapsn01:\\.\Tape2 is full
>02/21/2003 10:26:29 PM nsrd: media notice: 9840 tape 000554 used 7182 MB
of 20 GB capacity
>
>02/23/2003 08:41:06 AM nsrd: media warning: rd=frdpgpfmcspn1:\\.\Tape2
writing: unknown error 21 (0x15), at file 7 record 2715
>02/23/2003 08:41:06 AM nsrd: media notice: 9840 tape 000624 on
rd=frdpgpfmcspn1:\\.\Tape2 is full
>02/23/2003 08:41:06 AM nsrd: media notice: 9840 tape 000624 used 3828 MB
of 20 GB capacity
>
>Sometimes this error appears when it reach the end of tape and sometimes
this error message arrived before that
>I check everything in the SAN environment and Win 2K event log but nothing
on this
>
>If you known or if you have ideas to help me on this incident was very
interesting
>
There are lots of things that might be going wrong here, and most of them
are related to your SAN.
The error 21 means no such device, which indicates that the tape device has
become unavailable.
Things to check are:
Whether you have set up persistent binding on the HBA. This is not always
possible with all HBAs. Emulex supports this, but Qlogic does not on
Windows. If a tape device suddenly moves to a different SCSI address the OS
will get very confused very quickly. Also check that you have recent and
supported firmware on your HBA.
Whether you have turned off Removable Storage service in Windows 2000. The
results of getting this wrong is again that devices may change name.
SCSI reserve/release. Sadly this is not supported in Windows, so the best
you can do is to make absolutely sure that no two storage nodes will access
the same device simultaneously. Some Fibre/SCSI routers may have buggy
firmware that doesn't release a lock. Check that you have up to date
firmware on all your SAN kit.
Bus resets. Notoriously difficult to track down but can cause mayhem. SAN
zoning can help a lot with this.
You have provided no info on your SAN so I cannot be any more specific. You
may only have a small SAN but that does not mean that it is simple or that
it works properly. A lot of SAN kit really can't be made to work well with
tape drives, and Windows 2000 has quite a few flaws that make your life
more "challenging".
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