How to find the free space in VxVM 4.1mp3

[gmathew]

When i run the vxdg free command I see the length colum. Looking at the length output how do i calculate how much free space do i have?

Below is an example of vxdg free

# vxdg -g datadg free
DISK         DEVICE       TAG          OFFSET    LENGTH    FLAGS
disk01       EMC_CLARiiON3_2 EMC_CLARiiON3_2 83734528  141056    -
disk02       EMC_CLARiiON3_3 EMC_CLARiiON3_3 360992768 26961664  -

Thanks in advance for the help!

[g_lee · Accepted solution]

length is shown in sectors, so add the values together and work out how many bytes/kb/mb/gb that is depending on your platform.

NB: if you want to see the largest volume you can create (subject to default constraints, etc) then:
# vxassist -g <dg> maxsize
shows the largest size that can be created with the remaining/available space in a somewhat more readable format (not per disk though)

[Marianne]

On most Unix platforms it's 512 bytes per sector. You did not mention your O/S?

[vcs_man]

Any length showing in Volume Manager output  is in sectors. For Solaris , 512 bytes /sector.

So considering that you are using Solaris......

For disk01, (EMC_CLARiiON3_2)

 83734528 sectors gives you following..

Disk Size remaining = 83734528 / 2 =41867264   / 1024 = 40886 KB  / 1024 =  39.92 GB.

Additionally,  the command mentioned earlier doesn't show you what is the exact size for each disk.

# vxassist -g <dg> maxsize    --- This command will show you how much space is there in whole diskgroup which can be used to create new volume.

e.g. 

#vxassist -g testdg maxsize

Maximum volume size: 204800 (100Mb)


Thanks,
Mandar

[Gaurav_S]

simple formula to use:

Length * 512 / 1024 = xKB  /1024 = yMB  /1024 = zGB (available space in disk)

# vxdg -g datadg free
DISK         DEVICE       TAG          OFFSET    LENGTH    FLAGS
disk01       EMC_CLARiiON3_2 EMC_CLARiiON3_2 83734528  141056    -
disk02       EMC_CLARiiON3_3 EMC_CLARiiON3_3 360992768 26961664  -

so in your case for disk02

26961664 * 512 = 13480832 KB / 1024 = 13164.8 MB / 1024 = 12.85GB (available in disk02)

Hope this helps


Gaurav

[Jaeha]

it seems like you already got answer.  Yes, length or size in Volume Manager is sector, and it's 512bytes in all major unix platform.  so, you can devide by 2 get Kbytes, and devide by 1024*1024 to get GB.

Regards,
Jaeha