[Veritas-bu] Hardware compression not working
2006-04-18 15:31:36
Subject: |
[Veritas-bu] Hardware compression not working |
From: |
dcarlisle AT paychex DOT com (Carlisle, D Renee) |
Date: |
Tue, 18 Apr 2006 15:31:36 -0400 |
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, Austin Murphy
- [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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