[Veritas-vx] Mirror 5 column stripe to single subdisk?

[Mark Schipper]

Hello all,

I have a new 3par array that uber-stripes everything before you even create a LUN. The short story is...striping at the VXVM level does not buy you additional performance (if you have a single 3PAR array). I have some volumes that are on 4 column stripes (hardware RAID5 on the array) and I would like to move these volumes to the new 3PAR array. But vxassist doesn't want to let me mirror a plex made of 4 subdisks to a plex made of 1 subdisk, or so I am guessing.

Does anyone know of a way to mirror, migrate or evacuate a 4 column striped volume to a single plex and single subdisk?

Here's a snapshot:

[12:07:53][root at nfs08:/]# vxprint -htg epmnfsdg
DG NAME         NCONFIG      NLOG     MINORS   GROUP-ID
ST NAME         STATE        DM_CNT   SPARE_CNT         APPVOL_CNT
DM NAME         DEVICE       TYPE     PRIVLEN  PUBLEN   STATE
RV NAME         RLINK_CNT    KSTATE   STATE    PRIMARY  DATAVOLS  SRL
RL NAME         RVG          KSTATE   STATE    REM_HOST REM_DG    REM_RLNK
CO NAME         CACHEVOL     KSTATE   STATE
VT NAME         RVG          KSTATE   STATE    NVOLUME
V  NAME         RVG/VSET/CO  KSTATE   STATE    LENGTH   READPOL   PREFPLEX UTYPE
PL NAME         VOLUME       KSTATE   STATE    LENGTH   LAYOUT    NCOL/WID MODE
SD NAME         PLEX         DISK     DISKOFFS LENGTH   [COL/]OFF DEVICE   MODE
SV NAME         PLEX         VOLNAME  NVOLLAYR LENGTH   [COL/]OFF AM/NM    MODE
SC NAME         PLEX         CACHE    DISKOFFS LENGTH   [COL/]OFF DEVICE   MODE
DC NAME         PARENTVOL    LOGVOL
SP NAME         SNAPVOL      DCO
EX NAME         ASSOC        VC                       PERMS    MODE     STATE
SR NAME         KSTATE

dg epmnfsdg     default      default  61000    1109834580.1790.nfs01

dm TESTDEV      STK14_SUN3_19 auto    65535    4878540732 -
dm epmnfsdg20   STK03_SUN3_1 auto     86783    1425889280 -
dm epmnfsdg22   STK03_SUN3_9 auto     86783    1425889280 -
dm epmnfsdg25   STK03_SUN3_19 auto    86783    1425889280 -
dm epmnfsdg26   STK03_SUN3_20 auto    86783    1425889280 -

v  mmsc000      -            ENABLED  ACTIVE   14518272 SELECT    mmsc000-01 fsgen
pl mmsc000-01   mmsc000      ENABLED  ACTIVE   14535680 STRIPE    4/64     RW
sd epmnfsdg20-01 mmsc000-01  epmnfsdg20 0      3633920  0/0       STK03_SUN3_1 ENA
sd epmnfsdg22-01 mmsc000-01  epmnfsdg22 0      3633920  1/0       STK03_SUN3_9 ENA
sd epmnfsdg25-01 mmsc000-01  epmnfsdg25 0      3633920  2/0       STK03_SUN3_19 ENA
sd epmnfsdg26-01 mmsc000-01  epmnfsdg26 0      3633920  3/0       STK03_SUN3_20 ENA


[12:08:02][root at nfs08:/]# vxassist -g epmnfsdg mirror mmsc000 alloc=TESTDEV
VxVM vxassist ERROR V-5-1-437 Cannot allocate space to mirror 14518272 block volume
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