Sub-Disk Administration

SUB-DISKS:

1. Volume manager disk can be divided into one or more sub-disks.
2. Is a collection of contiguous blocks that represent a specific portion of a volume manager disk, which is mapped to a specific regions of physical disk.
3. Is a subsection of a disk's public region.
4. Is the smallest unit of storage in volume manager.
5. Conceptually, a sub-disk is similar to a partition.
6. Max size of a sub-disk is the size of the vxdisk.
7. Can create 4096 sub-disks/vmdisk.
8. Sub-disk cannot be shared among two plexes.


ADMINISTERING SUB-DISKS:
1. Creating the subdiks
2. Viewing the subdisk information
3. Associating the subdisk with the plex
4. Dissociating the subdisk from the plex
5. Deleting the subdisk



Creating sub disk:

Output:

bash-3.00# vxmake -g datadg sd datadg01-01 datadg01,0,8000
bash-3.00# vxprint -g datadg -st
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

sd datadg01-01 - datadg01 0 8000 - c1t12d0 ENA


bash-3.00# vxprint -g datadg -st
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

sd datadg01-01 - datadg01 0 8000 - c1t12d0 ENA


bash-3.00# vxmake -g oradg sd oradg02-05 oradg01,6291456,2g

bash-3.00# vxprint -g oradg -st
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

sd oradg02-01 vol1-01 oradg02 0 4194304 0 c1t10d0 ENA
sd oradg02-02 - oradg01 0 2097152 - c1t11d0 ENA
sd oradg02-04 - oradg01 2097152 4194304 - c1t11d0 ENA
sd oradg02-05 - oradg01 6291456 4194304 - c1t11d0 ENA


Viewing the sub disk information:

Output:

bash-3.00# vxprint -st
Disk group: oradg

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

sd oradg02-01 vol1-01 oradg02 0 4194304 0 c1t10d0 ENA

Disk group: newdg

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

sd newdg01-01 newvol1-01 newdg01 0 2097152 0 c1t9d0 ENA



bash-3.00# vxprint -g newdg -s
TY NAME ASSOC KSTATE LENGTH PLOFFS STATE TUTIL0 PUTIL0
sd newdg01-01 newvol1-01 ENABLED 2097152 0 - - -



bash-3.00# vxprint -g newdg -l newdg01-01
Subdisk: newdg01-01
info: disk=newdg01 offset=0 len=2097152
assoc: vol=newvol1 plex=newvol1-01 (offset=0)
flags: enabled
device: device=c1t9d0s2 path=/dev/vx/dmp/c1t9d0s2 diskdev=272/26



Associating the sub disk to the plex:

Output:

Case-1:

bash-3.00# vxmake -g oradg plex oradgvol01-01 sd=oradg02-02,oradg02-04
bash-3.00# vxprint -g oradg -pt
PL NAME VOLUME KSTATE STATE LENGTH LAYOUT NCOL/WID MODE

pl oradgvol01-01 - DISABLED - 6291456 CONCAT - RW
pl vol1-01 vol1 ENABLED ACTIVE 4194304 CONCAT - RW


Case-2:

bash-3.00# vxsd -g oradg assoc oradgvol01-01 oradg02-05 oradg02-06

bash-3.00# vxprint -g oradg -st
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

sd oradg02-01 vol1-01 oradg02 0 4194304 0 c1t10d0 ENA
sd oradg02-02 oradgvol01-01 oradg01 0 2097152 0 c1t11d0 ENA
sd oradg02-04 oradgvol01-01 oradg01 2097152 4194304 2097152 c1t11d0 ENA
sd oradg02-05 oradgvol01-01 oradg01 6291456 4194304 6291456 c1t11d0 ENA
sd oradg02-06 oradgvol01-01 oradg02 10485760 2097152 10485760 c1t10d0 ENA



Deleting/the sub disk:

Output:

bash-3.00# vxedit -g datadg rm datadg01-01

bash-3.00# vxsd -g oradg -o rm dis oradg02-06

bash-3.00# vxprint -g oradg -st
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

sd oradg02-01 vol1-01 oradg02 0 4194304 0 c1t10d0 ENA
sd oradg02-02 oradgvol01-01 oradg01 0 2097152 0 c1t11d0 ENA
sd oradg02-04 oradgvol01-01 oradg01 2097152 4194304 2097152 c1t11d0 ENA
sd oradg02-05 oradgvol01-01 oradg01 6291456 4194304 6291456 c1t11d0 ENA

bash-3.00# vxsd -g oradg dis oradg02-05
bash-3.00# vxprint -g oradg -st
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

sd oradg02-01 vol1-01 oradg02 0 4194304 0 c1t10d0 ENA
sd oradg02-02 oradgvol01-01 oradg01 0 2097152 0 c1t11d0 ENA
sd oradg02-04 oradgvol01-01 oradg01 2097152 4194304 2097152 c1t11d0 ENA
sd oradg02-05 - oradg01 6291456 4194304 - c1t11d0 EN



Note:
Sun Fire X 2100 image is posted.