You can do a scanner -n -v  and it will tell you the block size Networker
wrote the tape at..perhaps that is a good starting point?

Robert Maielo
Pioneer Data Systems


On Fri, 13 Aug 2004 10:49:19 -0400, Rich Graves <rcgraves AT BRANDEIS DOT EDU>
wrote:

>We have a backup SAN with 2 NetApps, 2 Suns, and 1 Linux dedicated storage
>node (licensed to back up only itself) sharing 7 AIT-3 drives, 3 of which
>are enabled for Dynamic Drive Sharing. The Suns are configured
>
>  SONY_AIT   =   1,0x36,0,0xd639,4,0x00,0x00,0x00,0x00,0;
>
>which I think means that they will use full 64K block size (Sun's default
>behavior is 64K - 1).
>
>The NetApps are at the defaults.
>
>The NetApps and Suns have interoperated happily for years.
>
>I'm not sure we've pinned it down, but I think the Suns and NetApps are
>having intermittent problems reading tapes originally labeled on the Linux
>box, and vice versa.
>
>On the Linux box, dmesg complains like
>
>st0: Failed to read 61440 byte block with 32768 byte read.
>st0: Failed to read 61440 byte block with 12288 byte read.
>st0: Failed to read 61440 byte block with 32768 byte read.
>st0: Failed to read 61440 byte block with 32768 byte read.
>st0: Failed to read 61440 byte block with 12288 byte read.
>st0: Failed to read 61440 byte block with 32768 byte read.
>st1: Failed to read 61440 byte block with 32768 byte read.
>st1: Failed to read 61440 byte block with 12288 byte read.
>st1: Failed to read 61440 byte block with 32768 byte read.
>st1: Failed to read 61440 byte block with 32768 byte read.
>
>I don't understand why anything is trying to do a 12288 read at all?
>
>What should I be trying to troubleshoot?
>
>The ultimate errors on the Solaris side are
>
>08/13/04 06:24:07 nsrd: media warning: /dev/rmt/16ubn reading: Not enough
space
>08/13/04 06:24:23 nsrd: media warning: /dev/rmt/16ubn reading: Tape label
read: Not enough space
>08/13/04 06:57:34 nsrd: media warning: /dev/rmt/14ubn reading: Not enough
space
>08/13/04 06:57:50 nsrd: media warning: /dev/rmt/14ubn reading: Tape label
read: Not enough space
>
>The Linux box does not log anything in daemon.log other than healthy nsrmmd
>starts and stops.
>
>The daemon.log errors relating to the NetApps are:
>
>08/13/04 03:02:00 nsrd: media info: loading volume A00621 into
rd=dop:nrst18a
>08/13/04 03:02:27 nsrd: rd=dop:nrst18a Verify label operation in progress
>08/13/04 03:02:34 nsrmmd #14: ndmp tape bsf failed
>08/13/04 03:02:48 nsrd: media warning: rd=dop:nrst18a reading: no tape
label found
>08/13/04 03:02:49 nsrd: rd=dop:nrst18a Eject operation in progress
>08/13/04 03:03:39 nsrd: Jukebox 'Qualstar' failed: expected
volume 'A00621' got 'NULL'.
>08/13/04 03:04:28 nsrd: media info: suggest mounting A00400 on dop for
writing  to pool 'NDMP'
>08/13/04 03:04:29 nsrd: media info: loading volume A00400 into
rd=dop:nrst18a
>08/13/04 03:04:47 nsrd: rd=dop:nrst18a Verify label operation in progress
>08/13/04 03:04:54 nsrmmd #14: ndmp tape bsf failed
>08/13/04 03:05:55 nsrd: media warning: rd=dop:nrst18a reading: no tape
label found
>08/13/04 03:05:56 nsrd: rd=dop:nrst18a Eject operation in progress
>
>On Linux, the tape says:
>
>[root@moe root]# tapeinfo -f /dev/sg20
>Product Type: Tape Drive
>Vendor ID: 'SONY    '
>Product ID: 'SDX-700C        '
>Revision: '0103'
>Attached Changer: No
>SerialNumber: '0001326788'
>MinBlock:2
>MaxBlock:16777215
>SCSI ID: 0
>SCSI LUN: 1
>Ready: no
>
>What more should I be looking at to troubleshoot/fix this?
>--
>Rich Graves <rcgraves AT brandeis DOT edu>
>UNet Systems Administrator
>
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