How to list mirrors of dirves

[Ratzie]

How can I tell if a drive has been successfully mirrored?

[Ermin Borovac · Accepted solution]

Mirroring is done on logical volume level. You can check if logical volume has been successfully mirrored with lvdisplay (Mirror copies should be 1 or 2).

# lvdisplay /dev/vg00/lvol10
--- Logical volumes ---
LV Name /dev/vg00/lvol10
VG Name /dev/vg00
LV Permission read/write
LV Status available/syncd
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 504
Current LE 63
Allocated PE 126
Stripes 0
Stripe Size (Kbytes) 0
Bad block on
Allocation strict
IO Timeout (Seconds) default

[Hazem Mahmoud_3]

Ermin is correct. You can tell by the lvdisplay command. If you find that it was not mirrored, make sure you have MirrorDisk installed. This needs to be installed to perform mirroring. Execute "swlist | grep Mirror".
Mirroring is performed with the lvextend command using the -m option.

-Hazem

[Uttamkumar Dravidam]

do lvlnboot -v /dev/vg00.

you will see mirrored drives for /stand,/root,swap,dump.

and as stated earlier do lvdisplay -v /dev/vg00/lvol10 | more

I hope this helps...

[Sunil Sharma_1]

In LVM Mirroring is done on volume basis not on disk basis. You can see this info using lvdisplay command.

If you want to see wheather mirroring is proper or not (fully sync or not) use below command

lvdisplay -v /dev/vgnn/lvolmm |grep stale |wc -l

Output of this command should be zero if volume is fully syncronise.

Sunil

[Geoff Wild]

Here's a a couple of scripts for you:

# cat chkstaledsks
#!/bin/sh
# Identifies and displays stale extends on all system volume groups.
# Useful to determine defect harddisks in mirrored enviroments
# Geoff Wild

vgdisplay -v | awk '/LV Name/ { print $3 }' | xargs lvdisplay -v | grep -i -e "lv name" -e "lv status" -e stale -e '?'



# cat chkdisks
#! /bin/sh

# Check the status of HP disks. i

# Currently this just checks for mirrored disks. Even this is not complete;
# while the script does verify that logical volumes are mirrored to different
# disks, it does not verify that logical volumes are mirrored across
# controllers.

VERBOSE=0
while getopts g:v flag
do
case $flag in
v)
VERBOSE=1
;;
*)
print "Usage: `basename $0` [-v] [vgs]"
print "\tIf no VGs are listed all will be checked."
exit 1
;;
esac
done

shift $((OPTIND -1))
VGs="$*"

TMPF=/tmp/lv.out.$$
trap "rm -f $TMPF; exit 1" 1 2 3 15

# First, print the headers. I should have a flag to suppress this.

printf "%-30s\t%-35s %-10s\n" "Logical Volume" Filesystem "Mirrored?"
printf "%-30s\t%-35s %-10s\n" "--------------" ---------- ---------

# First, generate the list of volume groups.
ALLVGs=`/usr/sbin/vgdisplay 2>/dev/null | grep 'VG Name' |\
awk '{print $3}' | sed 's,/dev/,,'`

VGs=${VGs:-$ALLVGs}

for vg in $VGs
do
LVs=`/usr/sbin/vgdisplay -v $vg | grep 'LV Name' | awk '{print $3}'`

for lv in $LVs
do
# Yuck, there has got to be a better way to do an
# anchored search. Yet I don't want to use perl.
str=`echo $lv | sed 's,/,.,g'`
fs=`awk '$1 ~ /^'$str'$/ {print $2}' /etc/mnttab`

# Check for mirrored disks. This is more complicated than
# I thought. There are cases where the LEs are mirrored to
# PEs on the same disks.
ismirr="no" # assume not mirrored
reason="" # but no reason

/usr/sbin/lvdisplay -v $lv > $TMPF
nummirr=`grep 'Mirror copies' $TMPF | awk '{print $3}'`
if [ $nummirr -gt 0 ]
then

# Check for volumes mirrored on the same disk,
# that is, where the number of PEs is more than
# the number of LEs.
badLEs=`grep '^ */dev/' $TMPF | awk '$2!=$3 {print $0}'`
if [ "x$badLEs" = "x" ]
then
ismirr="yes"
else
ismirr="no"
reason="$lv is mirrored on same disk."
fi
else
reason="$lv mirrored copies is 0."
fi

# Anything else to check for? Controller!
printf "%-30s\t%-35s %s\n" "$lv" "$fs" "$ismirr"

# If requested, explain why this disk is not mirrored
if [ $VERBOSE -gt 0 -a "$ismirr" = "no" ]
then
print "\t$reason"
fi
done
done

# Cleanup
/bin/rm -f $TMPF



Rgds...Geoff