Hi,
It appears that the problem is that, in spite of having written to devices
that are advertised as being non-compressed (Apunix's rsx0 and Sun's
rst8), the tapes were still written in compressed mode. Grrrrr.
Thanks to everyone who responded to my question:
John Rosenberg <jcr@ipl.bwh.harvard.edu>
greg.harrison@analog.com (greg harrison)
Mr S J Elliott <se@comp.lancs.ac.uk>
Nate-Itkin@ptdcs2.intel.com (Nate Itkin)
BILL BANHAM <bill.banham@gecm.com>
Garth
> To: sun-managers@ra.mcs.anl.gov
> Subject: exchanging tapes between Exabyte 8500 drives
> Date: Mon, 28 Aug 95 15:53:53 -0400
> From: longdon@itd.nrl.navy.mil
>
>
> Hi all,
>
> We have been writing our backup tapes on an Exabyte 8500-SC 8mm drive (part
> of an Apunix stacker).
>
> The Apunix drive supports compressed mode, but we're not using it; the tapes
> are written in uncompressed mode.
>
> We need to send the drive in for repairs/refurbishing, and have discovered
> that we can't read the tapes written with this drive on another Exabyte 8500
> drive (in a Sun enclosure).
>
> I've tried this with both Apunix's rsx0 driver, and the standard rst8 device,
> with the same result: tapes written on the Apunix Exabyte, when read on
> Sun Exabyte drive, give this error:
>
> longdon@thurber % restore if /dev/nrsx0
> Media read error: I/O error
>
> and the syslog message:
>
> sx0: ae=0x0(normal completion) as=1f<GOT_STATUS,XFER_DATA,SENT_CMD,GOT_TARGET,GOT_BUS> ss=0x0(good status) sense=0x3(medium error) ds=200140<WP,BOT,EOM> asense=0x61(unknown error)
>
> (or the case of reading from the st0 device):
>
> st0: Error for command 'read', Error Level: 'Fatal'
> Block: 0 File Number: 0
> Sense Key: Media Error
> Vendor (Exabyte EXB-8500 8mm Helical Scan) Unique Error Code: 0x30
> End-of-Media Detected
>
> (The tapes are written with 'dump 0f /dev/rsx0 /dev/sd0a')
>
> Has anyone had this problem, and is it solvable?
>
> Thanks in advance for any help,
>
> Garth Longdon
> Naval Research Laboratory
> Washington, DC 20375
> (202) 767-9035
> longdon@itd.nrl.navy.mil
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