Re: chvg on MAX PVs
From: Muthyam Reddy (MREDDY_at_JOY.COM)
Date: 11/22/04
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Date: Mon, 22 Nov 2004 11:22:24 -0500 To: aix-l@Princeton.EDU
** High Priority **
Hi Basim,
It worked well. Before converting volume group to Big, I moved couple
of raw logical volume from full disks and made some free PPs in each
disk.
Thank You.
muthyam
>>> basim.chafik@PLX.COM 11/19/2004 1:09:25 PM >>>
You can use chvg -B on any VG with some restriction. Check the man
pages for
restriction. chvg need to run on vary off vg only if they are varied on
in
concurrent mode. Also it is very important to have enough contiguous
space
on each PV for the vgda to grow.
I would recommend to do a backup of the VG before just in case that
the
conversion of the VG fails and it can not be varied on.
Basim Chafik
Senior Systems Analyst
IBM Certified Advanced Technical Expert (CATE)
1.800.688.4895
basim.chafik@plx.com
plexus (Division of BancTec)
-----Original Message-----
From: Muthyam Reddy [mailto:MREDDY@JOY.COM]
Sent: Friday, November 19, 2004 11:32 AM
To: aix-l@Princeton.EDU
Subject: Re: chvg on MAX PVs
Importance: High
** High Priority **
Thanks Basim,
First I will try with chvg -B option and savevg,restvg if chvg fails.
I
want these VGs to mirror and move to new storage.
One last question Basim, Is it going to hurt anything if I chose chvg
-B on Volume group with raw,jfs filesystems. I did chvg -B on empty
VGs
but not with data. Documentation says..VG should have close LVs and
varryof f before chvg.
Thanks once again.
muthyam
>>> basim.chafik@PLX.COM 11/19/2004 11:04:07 AM >>>
I were right when you said that you did a mistake choosing 32 as PP
size.
The optimal value that I see for such disk sizes would be 128 but now
it is
too late. The only way that I see possible to fix this would be to do
savevg
and restvg with larger PP size or you are stuck with 8 PVs per VG. Of
course
you have the option of converting the VG to big vg using 'chvg -B' but
that
will change to 128 (actually it should change to 32 because your
factor
is
set to 4 ???), but please make sure that you have enough space on each
disk
as the VGDA needs to grow.
Basim Chafik
Senior Systems Analyst
IBM Certified Advanced Technical Expert (CATE)
1.800.688.4895
basim.chafik@plx.com
plexus (Division of BancTec)
-----Original Message-----
From: Muthyam Reddy [mailto:MREDDY@JOY.COM]
Sent: Friday, November 19, 2004 10:35 AM
To: aix-l@Princeton.EDU
Subject: Re: chvg on MAX PVs
Importance: High
** High Priority **
Hi,
I have two volume groups dealing with this problem
1.dbvg1 (PP size=32Mb) MAX PPs per PV=4064
disk size
vpath10 91GB
vpath13 53GB
vpath14 61B
vpath15 61GB
vpath16 61GB
vpath18 53GB
vpath19 61GB
vpath21 104GB
2.sapvg (PP size=32Mb). MAX PPs per PV=65024
disk size
vpath1 91GB
vpath4 22GB
thank You.
muthyam
>>> basim.chafik@PLX.COM 11/19/2004 10:04:37 AM >>>
If nobody used the -t to change the factor the 'MAX PVs 8 and MAX PPs
per
PV" should be 1016 but sine it is 4064 this means that somebody change
the
factor to 4 to fit larger disk in a VG with smaller PP size. Depending
on
your largest disk size in the VG and the PP size you might be able to
change
it back or at least lower it, so please provide the size of all disks
in the
VG and the PP size for that VG and we can tell you if you are able to
change
to lower value which in turn can increase the number of disk in your
VG.
Basim Chafik
Senior Systems Analyst
IBM Certified Advanced Technical Expert (CATE)
1.800.688.4895
basim.chafik@plx.com
plexus (Division of BancTec)
-----Original Message-----
From: Muthyam Reddy [mailto:MREDDY@JOY.COM]
Sent: Thursday, November 18, 2004 5:35 PM
To: aix-l@Princeton.EDU
Subject: Re: chvg on MAX PVs
Importance: High
** High Priority **
Bill/Basim,
If I remember, I never got a situation to chose -t option to fit
more
PP in PVs. Is these any chance to force itself to fit more PPs in PV
when you chose small PP size while creating big volume group?I think
I
did a mistake while choosing PP size, 32mb for 550GB volume group
what chances I have to make this volume group big? Is it possible with
chvg -B option if I umount and close all LVs in that VG. I want this
volume group to mirror and then break to move all data to new shark
storage.
Thank You.
Muthyam
>>> basim.chafik@PLX.COM 11/18/2004 4:40:24 PM >>>
you have changed the limit of the number of physical partition per
physical
volume using 'chvg -t 4' in order to larger disk size to smaller PP
size
volume group. This will reduce the max number of PVs per VG
Basim Chafik
Senior Systems Analyst
IBM Certified Advanced Technical Expert (CATE)
1.800.688.4895
basim.chafik@plx.com
plexus (Division of BancTec)
-----Original Message-----
From: Muthyam Reddy [mailto:MREDDY@JOY.COM]
Sent: Thursday, November 18, 2004 4:25 PM
To: aix-l@Princeton.EDU
Subject: Re: chvg on MAX PVs
Importance: High
** High Priority **
Thanks Bill,
I have a volume group with MAX PVs 8 and MAX PPs per PV is 4064. In
this circumstances, can I change MAX PVs to 32 by using chvg -B
option.
For some reason I was unable to change MAX PVs number since I want to
add new disks(we re doing shark migration).
How can volume group get MAX PVs to 8 when default is 32.
thanks once again.
muthyam
>>> BVerzal@KOMATSUNA.COM 11/18/2004 3:56:00 PM >>>
By default it is 32. There is no need to make it smaller. -B means
'make
it a Big' volume group. -G means 'Gigantic'.
BV
-------------------------------------
There's no place like /home
Bill Verzal
Project Leader, Komatsu America
(847) 970-3726 - direct
(847) 970-4184 - fax
Muthyam Reddy
<MREDDY@JOY.COM>
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Subject
chvg on MAX PVs
11/18/2004 02:43
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Please respond to
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Discussion List
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** High Priority **
Hi Guys,
How to change volumegroup to set MAX PVs to 20. When I tried chvg with
-B option it goes 128 PVs.
Is these any other way to set MAX PVs other than using chvg -B
<volumegroup>.
thanks
muthyam
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