[linux-lvm] LVM2: vgscan is long...

[linux-lvm] LVM2: vgscan is long...

[Daniel Chénard]

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In my lvm.conf, I have set my filter 

filter = [ "a|hda*|", "a|hdb*|", "a|hdc*|" ]
filter = [ "r|cdrom|", "r|hdd*|" ]

but, when I do 

time lvm vgscan
  Reading all physical volumes.  This may take a while...
 
real    3m41.199s
user    0m0.889s
sys     0m1.088s

and ps -ef show me many modprobe -q -- block_major*

So, in my rc.sysinit,  I do 
"action $"Setting up Logical Volume Management:" /sbin/lvm vgscan
--mknodes && /sbin/lvm vgchange -a y"

So, 3m41.19 for a vgscan is too long for me.  Anybody could help me to
reduce this time??



Daniel Chénard 
Croesus Finansoft Inc.
Réputé pour créer de la richesse
 
Croesus Finansoft Inc.
2 Place Laval, Suite 510
Laval, Quebec
Canada H7N 5N6
Site Web: www.croesus.com
 
dchenard@croesus.com
Tel: +1 450-662-6101, 145
Fax: +1 450-662-3629

PS: The Light at the End of The Tunnel
     will be turned off until further
     notice due to budget cutbacks.
                             --The Management

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Re: [linux-lvm] LVM2: vgscan is long...

[Joe Thornber]

On Wed, Feb 18, 2004 at 11:37:38AM -0500, Daniel Ch?nard wrote:
> So, 3m41.19 for a vgscan is too long for me.  Anybody could help me to
> reduce this time??

If you are using 2.6 you could try the latest LVM2 tools from CVS.
There is a filter that uses sysfs to speed up vgscan (took a 35 second
scan to 2 seconds on my system).

- Joe

Re: [linux-lvm] LVM2: vgscan is long...

[Alasdair G Kergon]

On Wed, Feb 18, 2004 at 11:37:38AM -0500, Daniel Ch�nard wrote:
> In my lvm.conf, I have set my filter 
 
> filter = [ "a|hda*|", "a|hdb*|", "a|hdc*|" ]
> filter = [ "r|cdrom|", "r|hdd*|" ]
 
Only one filter applies: merge them into one line.
e.g. 
  filter = [ "a|hda*|", "a|hdb*|", "a|hdc*|", "r|.*|" ] 

And if this is 2.6, you may find the LVM2 source code in CVS runs faster.

Alasdair
-- 
agk@redhat.com