Timing is very important, opening the door will not interrupt any of the
backups that are going on, but if there is a tape mount request or tape
dismount request while the door is open or the robot is taking an inventory.
This would cause the robot and maybe the drive may be taken down.
Bob
-----Original Message-----
From: Lawrence, Bob [mailto:bob.lawrence AT primark DOT com]
Sent: Monday, January 29, 2001 8:39 AM
To: 'Michael Traves'; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: [Veritas-bu] Stuck Cleaning Tapes
Good idea, but unfortunately servicing the 9714 like that would require a
screwdriver/allen/hexkey - so thats a non-starter for my operators!
Is opening the robot door to fix one drive going to mess up my other active
backups?
(I'm guessing that door open for 30seconds is OK, but 10minutes is likely to
clash with a tape change request.....so that would be a problem?)
I take it from the lack of response that no one else has experienced
excessive stuck cleaning tapes, while data tapes are fine?
thanks
Bob
-----Original Message-----
From: Michael Traves [mailto:mtraves.news AT home DOT com]
Sent: 27 January 2001 03:11
To: David A. Chapa; Lawrence, Bob; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Stuck Cleaning Tapes
The 9714 is serviceable from the rear -- if you mark your drive down, you
should be able to slide it out and get the tape unstuck, assuming you don't
muck with the SCSI chain.
The 9714 also supports autoclean, which triggers only when the drive
requests a cleaning tape. This is the preferred method. It does not
support TapeAlert to my knowledge.
If you must use frequency based cleaning, set it for something higher -- 75h
to 125h are the ranges I've seen. Older drives typically require lower
settings.
----- Original Message -----
From: "David A. Chapa" <david AT datastaff DOT com>
To: "Lawrence, Bob" <bob.lawrence AT primark DOT com>;
<veritas-bu AT mailman.eng.auburn DOT edu>
Sent: Friday, January 26, 2001 4:16 PM
Subject: RE: [Veritas-bu] Stuck Cleaning Tapes
> You know there is a lot of discussion on cleaning tapes and their
uses...and
> I'm sure this will spark a long thread on the "To use or Not to use the
> Cleaning Tape Frequency" subject.
>
> Here's the news I received from a reliable source about how the cleaning
> tapes and DLT tape drives function.
>
> The basics are as such, the drive should only be "cleaned" when the drive
> indicates the requirement via the drive cleaning light. The fucntion of
the
> cleaning tape along with some minor 'cleaning' really is to re-calibrate
the
> amplitude of the drive heads. When the cleaning light appears on the
drive
> it is because the internal amplitude measurement has exceeded the norm.
The
> cleaning tape has certain properties that allow the tape drive to
> re-calibrate itself to operate within the acceptable range. When this is
> done the light on the drive goes off. If this fails to re-calibrate, then
> the clean drive light stays on. If the light remains on after multiple
> attempts to "clean" the drive, this may indicate a hardware problem.
>
> So, while I believe its important to "clean" the drives, I don't think it
> necessary to do it more often than the drive's requirement.
>
> As far as you tapes getting stuck in the drive...well there aren't too
many
> options there. Unfortunately you have to get access to that drive to free
> the stuck tape and that would require the robot to be offline.
>
> -----Original Message-----
> From: veritas-bu-admin AT Eng.Auburn DOT EDU
> [mailto:veritas-bu-admin AT Eng.Auburn DOT EDU]On Behalf Of Lawrence, Bob
> Sent: Friday, January 26, 2001 11:36 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Stuck Cleaning Tapes
>
>
>
> NBU 3.1.5 on NT4
> STK9714 with 6 DLT7000
> Master with 3 DLT7000 and robot arm
> 3 slaves, each with 1 drive in the STK9714
>
>
> I have 2 problems:
>
> 1. My cleaning tapes are getting stuck far more than usual, this seems to
> be when they use their last clean (20).
> Anyone experienced this?
> I have autocleaning on for every 25hrs of drive usage, I was advised to
use
> this figure, but I'm thinking it's too much.
> I've disabled autocleaning for now and chucked this batch of Maxell
> cleaners.
>
>
> 2. When a tape gets stuck, the drive goes down, so my Operators try and
> remove the stuck tape manually while other backups are running to the
other
> drives/slaves. Last night I had multiple stuck tapes and drives down,
can
> this be caused by the robot door being open so the robot is "offline"?
> (Door was open for quite a long time - during which another drive might
have
> needed a tape swap)
> If this is the case, how can you remove a stuck tape when other drives are
> in use?
>
>
> thanks
> Bob
>
>
> This e-mail, its content and any files transmitted with it are intended
> solely for the addressee(s) and are confidential and may be legally
> privileged. Access by any other party is unauthorised without the express
> prior written permission of the sender. If you have received this e-mail
in
> error you may not copy, disclose to any third party or use the contents,
> attachments or information in any way. Please destroy it and contact the
> sender via the Thomson Financial switchboard on (44) 207 369 7000 or via
> e-mail return. Internet communications are not secure unless protected
> using strong cryptography. This e-mail has been prepared using
information
> believed by the author to be reliable and accurate, but Thomson Financial
> does not accept responsibility for the timeliness, accuracy or
completeness
> of the information provided or for any changes to this e-mail, howsoever
> made, after it was sent. [The content of this e-mail and files
transmitted
> with it is (c) TFSL - 2000]
> _______________________________________________
> Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
> _______________________________________________
> Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
_______________________________________________
Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
|
