Veritas-bu

[Veritas-bu] Hardware compression not working

2006-04-18 14:41:35
Subject: [Veritas-bu] Hardware compression not working
From: jlightner AT water DOT com (Jeff Lightner)
Date: Tue, 18 Apr 2006 14:41:35 -0400
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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