My experience with SDLT has been very good so far; however, we've not
recycled very many of these. I've had rather poor success, however, with
LTO. I think part of the problem, at least with the case of the LTO, is
that we still have some kind of unresolved SCSI issue that causes the
SCSI bus to reset or do something weird wherein NetWorker totally loses
all comminucation with the picker from the affected LTO library. Often,
but not always, one or more LTO tapes will be prematurely marked full as
a result because NetWorker is erring on the side of caution and
purposely marking the tape full since it doesn't know how to interpret
the SCSI bus situation. It just says: "well, I see something I don't
like, and I don't know if it's the drive, the tape, or what, but I'm not
gonna risk using using this tape any more.", never mind the fact that
the tape may be perfectly fine. I've not seen to many similar situations
with the SDLT tapes because that library doesn't seem to be affected by
this, never mind the fact that both of them are on the same store node
server. Hmm... I would check to see that nothing strange is happening on
the SCSI bus. A tape that get's marked full prematurely is often a sign
of a bus reset or some other SCSI issue.
George
Steven Frost wrote:
>
> Hi there. I am finding that the attrition rate on our Super DLT tapes seems
> rather high.
> For tape that is purported to last 1,000,000 passes , we should not have ANY
> media problems.
> For example , a volume previously had 250GB+ written during the normal
> savegroup process and was marked as full
> without errors. On it's next cycle a media I/O error happens after, say,
> 25GB, and Legato uses another
> volume from the jukebox inventory. The tape with the media error is now
> useless ( after 25GB anyway).
> Is this normal?
> Our volumes at most would only have 20 saves done over the last 18 months, as
> we have had our SDLT drives since April 2002, and the tapes are re-used
> monthly. Out of 140 cartridges, nearly 22 are now dodgy. Is there a way to
> rejuvenate these?
> We have had dual Compaq/HP SDLT 160/320 drives in a Compaq MSL5026 Jukebox
> since November, beforehand they were 110/220 drives. We have replaced one of
> these drives twice now , as there were too many tape problems. If a tapedrive
> is 'shoeshining', would that affect the tape media?
> Any comments or similar experiences ? Thanks .
> #####################################################################################
> This e-mail message has been scanned for Viruses and Content and cleared
> by MailMarshal
> #####################################################################################
>
> ****************************************************************************************************************************
> CAUTION: This email and any attachments may contain information that is
> confidential. If you are not the intended recipient, you must not read,
> copy, distribute, disclose or use this email or any attachments. If you have
> received this email in error, please notify us and erase this email and any
> attachments. You must scan this email and any attachments for viruses.
> DISCLAIMER: Powerco Limited accepts no liability for any loss, damage or
> other consequences, whether caused by its negligence or not, resulting
> directly or indirectly from the use of this email or attachments or for any
> changes made to this email and any attachments after sending by Powerco
> Limited. The opinions expressed in this email and any attachments are not
> necessarily those of Powerco Limited.
>
> ****************************************************************************************************************************
>
> --
> Note: To sign off this list, send a "signoff networker" command via email
> to listserv AT listmail.temple DOT edu or visit the list's Web site at
> http://listmail.temple.edu/archives/networker.html where you can
> also view and post messages to the list.
> =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
--
Note: To sign off this list, send a "signoff networker" command via email
to listserv AT listmail.temple DOT edu or visit the list's Web site at
http://listmail.temple.edu/archives/networker.html where you can
also view and post messages to the list.
=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
|
