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Monday, 2 April 2012

Umirrorvg Command

This post shows what really the unmirrorvg command does:


bash-3.2# lsvg -p data

data:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk4            active            1084        1084        217..217..216..217..217
hdisk3            active            1084        1019        217..152..216..217..217
hdisk5            active            542         542         109..108..108..108..109

bash-3.2# lspv -l hdisk5
bash-3.2# lspv -l hdisk4
bash-3.2# lspv -l hdisk3
hdisk3:
LV NAME               LPs   PPs   DISTRIBUTION          MOUNT POINT
loglv01               1     1     00..01..00..00..00    N/A
fslv01                64    64    00..64..00..00..00    /data

The above output shows that I have a volume group called "data" which belongs to the physical volume "hdisk3" that hold some data in it across the mount point "/data"

bash-3.2# mirrorvg data hdisk4  /* Mirrored Data VG on hdisk4"

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         542         109..108..108..108..109
bash-3.2#

Now,

hdisk3 holds Original Copy.
hdisk4 holds 1st mirror Copy.

Now I go ahead to remove the Original copy from hdisk3.

bash-3.2# unmirrorvg data hdisk3
0516-1133 unmirrorvg: Quorum requirement turned on, varyoff and varyon
        volume group for this to take effect.
bash-3.2# lsvg -l data
data:
LV NAME             TYPE       LPs   PPs   PVs  LV STATE      MOUNT POINT
loglv01             jfs2log    1     1     1    open/syncd    N/A
fslv01              jfs2       64    64    1    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        1084        217..217..216..217..217
hdisk5            active            542         542         109..108..108..108..109
bash-3.2#

Now I again do mirroring on hdisk5.

So,

hdisk4 holds Original Copy (former 1st mirror copy).
hdisk4 holds mirror copy.

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
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         477         109..43..108..108..109
bash-3.2# lspv -l hdisk5
hdisk5:
LV NAME               LPs   PPs   DISTRIBUTION          MOUNT POINT
loglv01               1     1     00..01..00..00..00    N/A
fslv01                64    64    00..64..00..00..00    /data
bash-3.2# lspv -l hdisk4
hdisk4:
LV NAME               LPs   PPs   DISTRIBUTION          MOUNT POINT
loglv01               1     1     00..01..00..00..00    N/A
fslv01                64    64    00..64..00..00..00    /data
bash-3.2# lspv -l hdisk3
bash-3.2#

So, we I have only one mirror copy on "hdisk5".

So, I unmirror the volume group.

bash-3.2# unmirrorvg data
0516-1133 unmirrorvg: Quorum requirement turned on, varyoff and varyon
        volume group for this to take effect.
bash-3.2# lsvg -l data
data:
LV NAME             TYPE       LPs   PPs   PVs  LV STATE      MOUNT POINT
loglv01             jfs2log    1     1     1    open/syncd    N/A
fslv01              jfs2       64    64    1    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        1084        217..217..216..217..217
hdisk5            active            542         542         109..108..108..108..109
bash-3.2#


So, the data on the hdisk5 has been removed.


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