vxprint output description

[allaboutunix]

Hi I am nwbie in vxvm, I want to understand a scenario,Kindly help me on this,

a) In this vxprint o/p, what does these 4 plexes means.. which type of RAID configuration it is, if there are 2 plexes or 5 plexes what  would be the RAID configuration.

b) What is meant by DISKOFFS & LENGTH mentioned here.. in SD section. Does that size in 512-byte blocks or 1024-byte blocks?

c) What is 0 denoted here after LENGTH in SD section?

Here is the output,

vxdisk -o alldgs list
   DEVICE       TYPE      DISK         GROUP        STATUS
   c1t0d0s2     sliced    rootdisk     rootdg       online
   c1t1d0s2     sliced    rootmirror   rootdg       online
   c1t2d0s2     sliced    awasdat02    awasdatadg   online
   c1t3d0s2     sliced    awasdat01    awasdatadg   online
   c1t4d0s2     sliced    awasdat03    awasdatadg   online
   c1t5d0s2     sliced    awasdat04    awasdatadg   online

Disk group: awasdatadg

   DG NAME         NCONFIG      NLOG     MINORS   GROUP-ID
   DM NAME         DEVICE       TYPE     PRIVLEN  PUBLEN   STATE
   V  NAME         USETYPE      KSTATE   STATE    LENGTH   READPOL   PREFPLEX
   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

   dg awasdatadg   default      default  48000    1066928446.1328.awasexp1

   dm awasdat01    c1t3d0s2     sliced   2888     71124291 -                            <---
   dm awasdat02    c1t2d0s2     sliced   2888     71124291 -                            <---
   dm awasdat03    c1t4d0s2     sliced   2888     71124291 -                            <---
   dm awasdat04    c1t5d0s2     sliced   2888     71124291 -                            <---

   v  migration    fsgen        ENABLED  ACTIVE   8388608  SELECT    -
   pl migration-05 migration    ENABLED  ACTIVE   8388608  CONCAT    -        RW
   sv migration-S02 migration-05 migration-L02 1  8388608  0         3/3      ENA

   v  migration-L02 fsgen       ENABLED  ACTIVE   8388608  SELECT    -
   pl migration-P04 migration-L02 ENABLED ACTIVE  LOGONLY  CONCAT    -        RW
   sd awasdat02-16 migration-P04 awasdat02 26226342 15     LOG       c1t2d0   ENA
   pl migration-P05 migration-L02 ENABLED ACTIVE  8388608  CONCAT    -        RW
   sd awasdat02-19 migration-P05 awasdat02 54526986 8388608 0        c1t2d0   ENA
   pl migration-P06 migration-L02 ENABLED ACTIVE  8388608  CONCAT    -        RW
   sd awasdat01-04 migration-P06 awasdat01 54524097 8388608 0        c1t3d0   ENA

vxdisk -o alldgs list
   DEVICE       TYPE      DISK         GROUP        STATUS
   c1t0d0s2     sliced    rootdisk     rootdg       online
   c1t1d0s2     sliced    rootmirror   rootdg       online
   c1t2d0s2     sliced    awasdat02    awasdatadg   online
   c1t3d0s2     sliced    awasdat01    awasdatadg   online
   c1t4d0s2     sliced    awasdat03    awasdatadg   online
   c1t5d0s2     sliced    awasdat04    awasdatadg   online
 

[Gaurav_S · Accepted solution]

Hello,

I would recommend to read through the guides to understand different types of volume layouts . Start with sf admin guide

To answer your questions

a) In this vxprint o/p, what does these 4 plexes means.. which type of RAID configuration it is, if there are 2 plexes or 5 plexes what  would be the RAID configuration.

--> This depends on how volume was created. You can have two plexes in RAID 1 i.e. mirrored state (if both the size of plex is same), you can have them in concat or stripe. OR you can also have them in RAID 1+0 or vice versa which means concat-mirror, mirror-concat, stripe-mirror or mirror-stripe. These are called layered volumes. A layered volume will have an object called sub-volume which is denoted by "sv". You seem to have a sub-volume which indicates you might have a layered volume which may be concat-mirror or mirror-concat. Read through below link in detail

https://sort.symantec.com/public/documents/sfha/6.2/solaris/productguides/html/sf_admin/ch06s02s01.htm

b) What is meant by DISKOFFS & LENGTH mentioned here.. in SD section. Does that size in 512-byte blocks or 1024-byte blocks?

Length would actually denote the size of subdisk in a volume .. depending on layout of volume, various sub-disks will form a volume. )Length x 512) / 1024 / 1024 /1024 will give you size in GB. you can try converting a volume size into GB. Diskoffs as the name indicates are disk offsets

c) What is 0 denoted here after LENGTH in SD section?

refer to legends at the beginning of the vxprint output, the sd line legends are

   SD NAME         PLEX         DISK     DISKOFFS LENGTH   [COL/]OFF DEVICE   MODE

the 0 here would indicate the column/offset

G

[allaboutunix]

So if I take this one as,

sd awasdat02-19 migration-P05 awasdat02 54526986 8388608 0        c1t2d0   ENA

Does that mean,on disk awasdat02 has size  of 54526986 *512 /1024/1024/1024 = 26GB  out of which 

8388608 *512/1024/1024/1024 = 4 GB available.

[Gaurav_S]

No,

vxprint output will never tell you available space .. you can only see available space via filesystem (not at the volume level)

Compare the headers once again

SD   NAME              PLEX              DISK          DISKOFFS         LENGTH   [COL/]OFF DEVICE  

sd   awasdat02-19   migration-P05   awasdat02     54526986          8388608         0        c1t2d0      

That means 54526986 is disk offset while 8388608 (4GB) is the length of this subdisk

G