Expansion of existing LUN - chvg

Expansion of existing LUN



# sanlun lun show | grep /vol/server1_lun09.lun
   csnafa07:  /vol/server1_lun09.lun        hdisk210         fcs0     FCP        840.1g (902031212544)   GOOD  


server1:/root # chdev -l hdisk210 -a algorithm=round_robin -a reserve_policy=no_reserve -a queue_depth=32 -a rw_timeout=180
hdisk210 changed



server1:/root # extendvg oraclevg hdisk210
0516-1254 extendvg: Changing the PVID in the ODM.


server1:/root # lsvg -p oraclevg
oraclevg:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk189          active            18479       0           00..00..00..00..00
hdisk190          active            18479       64          00..00..00..00..64
hdisk210          active            6720        6720        1344..1344..1344..1344..1344





expansion of an existing lun.... Increase the same lun with 10GB more (total 850GB)
change needs to be done on the filer end first, then rescan on the host

csnafa07> lun resize /vol/server1_lun09.lun +10g
lun resize: resized to:  850.1g (912827351040)



server1:/root # cfgmgr

server1:/root # lsvg -p oraclevg
oraclevg:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk189          active            18479       0           00..00..00..00..00
hdisk190          active            18479       64          00..00..00..00..64
hdisk210          active            6720        6720        1344..1344..1344..1344..1344



server1:/root # chvg -g oraclevg


server1:/root # lsvg -p oraclevg
oraclevg:
PV_NAME           PV STATE          TOTAL PPs   FREE PPs    FREE DISTRIBUTION
hdisk189          active            18479       0           00..00..00..00..00
hdisk190          active            18479       64          00..00..00..00..64
hdisk210          active            6800        6800        1360..1360..1360..1360..1360



Note:
Never do reduction in lun should not be done online when there is data in it, which would cause data corruption
Expansion is allowed... reduction is not allowed