[Veritas-bu] Hardware compression not working
2006-04-18 15:55:48
Not sure if this is the issue for you but our experience with tape drives and
HP might help.
We're using AIT-3 and what we've had to do from the beginning is configure them
to emulate AIT-1 drives. This is done from our library, not on the host.
It's necessary because HP only produces drivers for the AIT-1 model -- I guess
they just haven't felt like keeping up the drivers as new models come out. At
any rate, this might be something to consider in your case. I don't have the
beginning of the thread so I don't know what type/model tape drive you're using
but you might want to check to make sure they have driver support for this
model. Or you could look into emulating older models of the same tape drive
and see what happens.
-Dave
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu [mailto:veritas-bu-admin
AT mailman.eng.auburn DOT edu] On Behalf Of Carlisle, D Renee
Sent: Tuesday, April 18, 2006 12:32
To: Jeff Lightner; bob944 AT attglobal DOT net; veritas-bu AT
mailman.eng.auburn DOT edu
Subject: RE: RE: [Veritas-bu] Hardware compression not working
We are using BEST on HP, we have done numerous testing with new tapes and
consistent data and compression has not been working since we switched over to
the IBM library.
Reneé Carlisle
Sr. Systems Administrator
675 Basket Road
Webster, NY 14580
Jer 29:11-13
585-216-0497 (w)
585-472-2360 (c)
-----Original Message-----
From: Jeff Lightner [mailto:jlightner AT water DOT com]
Sent: Tuesday, April 18, 2006 2:42 PM
To: Carlisle, D Renee; bob944 AT attglobal DOT net; veritas-bu AT
mailman.eng.auburn DOT edu
Subject: RE: RE: [Veritas-bu] Hardware compression not working
Didn't respond earlier because I thought your post regarding Sun only. On HP
the device's minor specifies settings of the drive's device entries - it will
have several. You need to make sure your minor numbers are for the "Best"
density which would include compression.
Also as noted by another poster I have seen on HP-UX that when I wrote to a
drive using its non-compressed device entry that subsequent writes to that
device where I couldn't specify the density made it continue to write in a
non-compressed mode. This was for a backup I was doing from the boot prompt
(don't remember how exactly I did that). By booting up the OS then doing a
short write to the device file that had compression enabled then going back
down to the boot prompt I was able to make it write compression.
Not sure how familiar with HP-UX you are. It has a command called "lssf" for
listing special files. For tape devices it will show you detail.
Example chosen at random from my HP-UX master server:
lssf /dev/rmt/c9t3d5BEST
stape card instance 9 SCSI target 3 SCSI LUN 5 at&t best density available at
address 0/6/1/0/4/0.98.54.255.1.3.5 /dev/rmt/c9t3d5BEST
Shows it is the best density available so I know it has compression. You
might want to try running lssf on the devices you have configured in HP-UX to
insure they have this.
-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu [mailto:veritas-bu-admin
AT mailman.eng.auburn DOT edu] On Behalf Of Carlisle, D Renee
Sent: Tuesday, April 18, 2006 12:16 PM
To: bob944 AT attglobal DOT net; veritas-bu AT mailman.eng.auburn DOT edu
Subject: RE: RE: [Veritas-bu] Hardware compression not working
I answered the compression issue in a previous post, we definitely are not
getting compression. The reason I mentioned the library is that it does not
seem to be at the hardware level since the tapes are obviously compressing on
the test side of the world and we are using the same library. IBM, Sun, and
Veritas are all involved right now (even though it is across HP, Sun, and
Windows), but everyone is scratching their heads. Just trying to think outside
the box now.
Reneé Carlisle
Sr. Systems Administrator
675 Basket Road
Webster, NY 14580
Jer 29:11-13
585-216-0497 (w)
585-472-2360 (c)
-----Original Message-----
From: bob944 [mailto:bob944 AT attglobal DOT net]
Sent: Tuesday, April 18, 2006 11:20 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Cc: Carlisle, D Renee
Subject: RE: RE: [Veritas-bu] Hardware compression not working
> Date: Tue, 18 Apr 2006 10:42:58 -0400
> From: "Carlisle, D Renee" <dcarlisle AT paychex DOT com>
What makes you believe that hardware compression is not working?
I'd suggest proving the compression assertion first, then getting support
people for the drive/library/drivers involved.
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- [Veritas-bu] Hardware compression not working, (continued)
- [Veritas-bu] Hardware compression not working, WEAVER, Simon
- [Veritas-bu] Hardware compression not working, Whelan, Patrick
- [Veritas-bu] Hardware compression not working, Carlisle, D Renee
- [Veritas-bu] Hardware compression not working, bob944
- [Veritas-bu] Hardware compression not working, Carlisle, D Renee
- [Veritas-bu] Hardware compression not working, Mark Pinder
- [Veritas-bu] Hardware compression not working, Jeff Lightner
- [Veritas-bu] Hardware compression not working, Carlisle, D Renee
- [Veritas-bu] Hardware compression not working,
Cornely, David <=
- [Veritas-bu] Hardware compression not working, Mansell, Richard
- [Veritas-bu] Hardware compression not working, bob944
- [Veritas-bu] Hardware compression not working, Carlisle, D Renee
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