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Monday, 2 April 2012

Unmirrorvg Cont...

Now, we discuss the mirroring using 3 disks.


bash-3.2# lsvg -p data
data:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk4            active            1084        1019        217..152..216..217..217
hdisk3            active            1084        1084        217..217..216..217..217
hdisk5            active            542         542         109..108..108..108..109

hdisk4 : Original Copy.

bash-3.2# mirrorvg -c 3 data hdisk3 hdisk5
0516-1125 mirrorvg: Quorum requirement turned off, varyoff and varyon
        volume group for this to take effect.
bash-3.2# lsvg -p data
data:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk4            active            1084        1019        217..152..216..217..217
hdisk3            active            1084        1019        217..152..216..217..217
hdisk5            active            542         477         109..43..108..108..109
bash-3.2# lsvg -l data
data:
LV NAME             TYPE       LPs   PPs   PVs  LV STATE      MOUNT POINT
loglv01             jfs2log    1     3     3    open/syncd    N/A
fslv01              jfs2       64    192   3    open/syncd    /data
bash-3.2#

So, as per the command executed. I can say,

hdisk4: Original.
hdisk3: 1st mirror.
hdisk5: 2nd mirror.

Now, will try this.

bash-3.2# lsvg -p data
data:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk4            active            1084        1019        217..152..216..217..217
hdisk3            active            1084        1019        217..152..216..217..217
hdisk5            active            542         477         109..43..108..108..109
bash-3.2# unmirrorvg -c 2 data
bash-3.2# lsvg -p data
data:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk4            active            1084        1019        217..152..216..217..217
hdisk3            active            1084        1019        217..152..216..217..217
hdisk5            active            542         542         109..108..108..108..109
bash-3.2#

The above command proves that the 2nd copy was in hdisk5 and its removed. 

Now we will mirror it back.

bash-3.2# mirrorvg data hdisk5

0516-1118 mirrorvg: No logical volumes in volume group to mirror.
0516-1200 mirrorvg: Failed to mirror the volume group.
bash-3.2# lsvg -l data
data:
LV NAME             TYPE       LPs   PPs   PVs  LV STATE      MOUNT POINT
loglv01             jfs2log    1     2     2    open/syncd    N/A
fslv01              jfs2       64    128   2    open/syncd    /data

The above command failed to mirror. But the command is correct. 

But it worked when I executed like this,

bash-3.2# mirrorvg -c 3 data hdisk5
bash-3.2# lsvg -l data
data:
LV NAME             TYPE       LPs   PPs   PVs  LV STATE      MOUNT POINT
loglv01             jfs2log    1     3     3    open/syncd    N/A
fslv01              jfs2       64    192   3    open/syncd    /data
bash-3.2# lsvg -p data
data:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk4            active            1084        1019        217..152..216..217..217
hdisk3            active            1084        1019        217..152..216..217..217
hdisk5            active            542         477         109..43..108..108..109

This needs an explanation...


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