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Disable Compression Question

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Corey Arndt

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Jan 20, 2004, 5:47:48 PM1/20/04
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Currently our Groupwise 5.2 Server is running compression.
I would like to turn off compression to hopefully remove some minor problems
we have had.
Is there anything special I need to do or be aware so that my chances for
problems will be limited?
I plan on dismounting the volume and changing the setting in the Install
Screen.
Will the data automatically decompress or should I do something prior?
Any help with this would greatly be appreciated.
I almost forgot.
We are using NW 4.11 with SP9. The server is only running GW 5.2.
Thanks again


Dave Lunn

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Jan 20, 2004, 6:02:44 PM1/20/04
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All you can do is push days untouched before compression out to some long
number. the files will not decompress until they have been accessed twice
in rapid succession. If you *want* that to happen, do a file find search
for text inside a file twice in a row.
--
Dave Lunn
NSC SysOp
http://support-forums.novell.com


Barry Schnur

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Jan 20, 2004, 7:11:31 PM1/20/04
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Dave, I am not sure on this, but do you need *two* reads if you also set:

Set Convert Compressed to Uncompressed Option = 2

--
Barry Schnur
Novell Support Connection Volunteer Sysop

Dave Lunn

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Jan 20, 2004, 8:25:13 PM1/20/04
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Good question. I think you do because I think you just don't compress after
a file gets decompressed and the control for decompression would still be
the two reads I would think.

Frankly, on all my 4.x stuff the disks are IDE and slow enough that the CPU
has plenty of time to decompress files without slowing access. With 4.x
compression and suballocation are so good they *never* give me grief.

Barry Schnur

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Jan 20, 2004, 9:22:32 PM1/20/04
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OK -- I have a 4.2 server -- here is the detail I got:

Set Convert Compressed to Uncompressed Option

What to do to the uncompressed version when the server uncompresses a file:

0 = Always Leave Compressed Version
1 = If Compressed file is read only once (within the time frame defined
by "Days Untouched Before Compression") then leave the file
compressed (on second access leave uncompressed).
2 = Always change to the uncompressed version.

The default is 1 and that is the behavior we typically expect to see.

Corey Arndt

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Jan 21, 2004, 1:33:43 PM1/21/04
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Thank you for the information. It gives me some good options.
The only reason I wanted to disable compression is that I had read somewhere
that the volume were GroupWise was installed should have compression
disabled. Other than that I have no other reasons to disable compression.


Barry Schnur

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Jan 21, 2004, 5:18:55 PM1/21/04
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Ah -- OK -- with Traditional volumes (and of course any NW 4x volume is
Traditional), compression is not all that troublesome.

One other consideration would be to configure a new volume (say for
GroupWise) and disable compression from the start.

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