Re: Checking if the rootvg disk is mirrored
From: Hunter, Mark (Mark.Hunter_at_ANHEUSER-BUSCH.COM)
Date: 09/13/04
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Date: Mon, 13 Sep 2004 14:07:55 -0500 To: aix-l@Princeton.EDU
Ummm... No.
VG Descriptors has nothing to do with mirroring.
If you have 1 drive in the vg, VG Des = 2
If you have 2 drives in the vg, VG Des = 3
If you have 3 drives or more in the vg, vg des = # of PVs
There is nothing in lsvg that can determine if mirroring is going on except lsvg
-l and checking if the number of PPs is > # of LPs for each lv.
You should also disable quorum if mirroring since if you lose half your drives
(common case of losing a drawer/rack) quorum would be lost but you should still
have access to all.
Here is what I use nightly on my systems:
integer num_val
for n in $(/usr/sbin/lsvg -o) # we have HA, so check active only
do
/usr/sbin/lsvg -l $n | tail +3 | awk '$2!="sysdump"{print $1}' - |
while read lv # sysdump should not be mirrored
do
num_val=$(/usr/sbin/lsattr -E -l $lv -a copies | awk '{print $2}' -)
if [ $num_val -ne 2 ]
then
unmirrored_lvs="$lv $unmirrored_lvs"
fi
done
num_val=$(/usr/sbin/lsvg $n | awk '/QUORUM/{print $NF}' -)
if [ $num_val -ne 1 ] # quorum bad for mirroring at copies=2
then
quorum_vgs="$n $quorum_vgs"
fi
val=$(/usr/sbin/lsvg $n | awk '/AUTO SYNC/{print $NF}' -)
if [ "$val" = "no" ] # autosync is good
then
nosync_vgs="$n $nosync_vgs"
fi
done
if [ ! -z "$unmirrored_lvs" ]
then
echo "UNMIRRORED_LVS = \"$unmirrored_lvs\""
else
echo "UNMIRRORED_LVS = \"None\""
fi
if [ ! -z "$quorum_vgs" ]
then
echo "QUORUM_TURNED_ON_VGS = \"$quorum_vgs\""
Else
echo "QUORUM_TURNED_ON_VGS = \"None\""
fi
if [ ! -z "$nosync_vgs" ]
then
echo "NOT_AUTO_SYNC_VGS = \"$nosync_vgs\""
else
echo "NOT_AUTO_SYNC_VGS = \"None\""
fi
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of Ray,
Mark
Sent: Monday, September 13, 2004 8:21 AM
To: aix-l@Princeton.EDU
Subject: Re: Checking if the rootvg disk is mirrored
Man, you guys are taking this mirror checking the hard way.
Just do an "lsvg rootvg"; if the number of volume descriptors in rootvg is
greater than the number of *physical* volumes, then you're mirroring.
Mark Ray
-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of Jan-Frode
Myklebust
Sent: Friday, September 10, 2004 7:09 PM
To: aix-l@Princeton.EDU
Subject: Re: Checking if the rootvg disk is mirrored
On Fri, Sep 10, 2004 at 07:43:46PM -0300, Antonio Vázquez wrote:
>
> PD: Besides using "lslv -l rootvg | some_script_that_checks each LV
> and compares PPs with LPs"... but, if there´s no simple way to do it,
> I would accept a sample of that script! :)
Here's mine. I run it from cron nightly, because at some point we had a bug
where the mirrored LPs where on the same disk..
-------------------------------------------------------------------
#! /bin/ksh -
#
VOLUMES=`lsvg -l rootvg | awk '{if ($5 == "2") print $1}'` BROKEN=0 for volume
in $VOLUMES do
lslv -m $volume | egrep -q 'hdisk0.*hdisk0|hdisk1.*hdisk1' && \
BROKEN=1 && print "\nThe volume \"$volume\" is a broken mirror on node:
`hostname | tr -s [a-z] [A-Z]`"
done
if [[ "$BROKEN" -eq "1" ]]
then
print "\nUse \"lslv -m \$volume\" to inspect LP placement".
print "Use \"reorgvg rootvg \$volume\" to fix these mirror problems."
fi
-------------------------------------------------------------------
-jf
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- Previous message: Antonio Vázquez: "Re: Checking if the rootvg disk is mirrored"
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- Reply: JOSEPH KREMBLAS: "Re: Checking if the rootvg disk is mirrored"
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