Smartmove: First look

Introduction:

This test regards the new smartmove feature introduced with MP3:

Enviroment:

OS AIX 5300-07-02-0806
Storage Fondation 5.0MP3RP1
Storage 2 LUNS XP24K 100GB

Test:
Mirror an empty filesystem

Initial situation:

diskgroup with a volume of  97.615 GB

root@/ #vxprint -Qqthg smartdg
dg smartdg      default      default  3000     1239178875.70.tx088sd1
dm disk0        xp12k0_0     auto     65536    204713728 -
dm disk1        xp12k0_1     auto     65536    204713728 -
v  smartvol0    -            ENABLED  ACTIVE   204713728 SELECT   -        fsgen
pl smartvol0-01 smartvol0    ENABLED  ACTIVE   204713728 CONCAT   -        RW
sd disk0-01     smartvol0-01 disk0    0        204713728 0        xp12k0_0 ENA

root@ / #df -g /mnt/smartfs
Filesystem    GB blocks      Free %Used    Iused %Iused Mounted on
/dev/vx/dsk/smartdg/smartvol0     97.62     91.43    7%        4     1% /mnt/smartfs

root@ / #time vxassist -g smartdg mirror smartvol0 alloc=disk1
real    36m57.56s
user    33m29.99s
sys     1m18.48s

Time taken for a traditional mirror 36m57.56s

root@/ #vxtask -l list
Task:      163 RUNNING
Type:      ATCOPY
Operation: PLXATT Vol smartvol0 Plex smartvol0-02 Dg smartdg
Started:   Wed Apr  8 10:26:13 DFT 2009
Throttle:  0
Progress:  1.65% 3379200 of 204713728 Blocks
Work time: 34 seconds (33:45 remaining)

Print after mirror:

root@tx088sd1 / #vxprint -Qqthg smartdg
dg smartdg      default      default  3000     1239178875.70.tx088sd1
dm disk0        xp12k0_0     auto     65536    204713728 -
dm disk1        xp12k0_1     auto     65536    204713728 -
v  smartvol0    -            ENABLED  ACTIVE   204713728 SELECT   -        fsgen
pl smartvol0-01 smartvol0    ENABLED  ACTIVE   204713728 CONCAT   -        RW
sd disk0-01     smartvol0-01 disk0    0        204713728 0        xp12k0_0 ENA
pl smartvol0-02 smartvol0    ENABLED  ACTIVE   204713728 CONCAT   -        RW
sd disk1-01     smartvol0-02 disk1    0        204713728 0        xp12k0_1 ENA

Recreate initial situation:

root@ / #vxplex -g smartdg dis smartvol0-02
root@ / #vxedit -g smartdg -rf rm smartvol0-02

root@ / #vxprint -Qqthg smartdg
dg smartdg      default      default  3000     1239178875.70.tx088sd1
dm disk0        xp12k0_0     auto     65536    204713728 -
dm disk1        xp12k0_1     auto     65536    204713728 -
v  smartvol0    -            ENABLED  ACTIVE   204713728 SELECT   -        fsgen
pl smartvol0-01 smartvol0    ENABLED  ACTIVE   204713728 CONCAT   -        RW
sd disk0-01     smartvol0-01 disk0    0        204713728 0        xp12k0_0 ENA

root@ / #df -g /mnt/smartfs
Filesystem    GB blocks      Free %Used    Iused %Iused Mounted on
/dev/vx/dsk/smartdg/smartvol0     97.62     91.43    7%        4     1% /mnt/smartfs

Enable smartmove:

root@ / # echo usefssmartmove=all >> /etc/default/vxsf
root@/ #cat /etc/default/vxsf
usefssmartmove=all

Mirror with smartmove

root@ / #time vxassist -g smartdg mirror smartvol0 alloc=disk1
real    0m3.32s
user    0m2.05s
sys     0m0.13s

Time taken mirroring with smartmove 0m3.32s

.......I didn't get a vxtask output from another shell :-)

root@ / #vxtask -l list
root@ / #

root@ / #vxprint -Qqthg smartdg
dg smartdg      default      default  3000     1239178875.70.tx088sd1
dm disk0        xp12k0_0     auto     65536    204713728 -
dm disk1        xp12k0_1     auto     65536    204713728 -
v  smartvol0    -            ENABLED  ACTIVE   204713728 SELECT   -        fsgen
pl smartvol0-01 smartvol0    ENABLED  ACTIVE   204713728 CONCAT   -        RW
sd disk0-01     smartvol0-01 disk0    0        204713728 0        xp12k0_0 ENA
pl smartvol0-02 smartvol0    ENABLED  ACTIVE   204713728 CONCAT   -        RW
sd disk1-01     smartvol0-02 disk1    0        204713728 0        xp12k0_1 ENA

NB the filesystem MUST be mounted

Conclusions:

We used an empty filesystem to have a clear demo of the potential of the smartmove and in this test the mirror taken the time of a mkfs ;-)

Cheers
Marco