Veritas Volume Manager - vxassist maxsize prob

[telemorgan]

Hey guys

I have 4 disks ( besides the two that belong to rootdg ) that I am looking to create under a RAID5 volume.

# vxdisk list
DEVICE TYPE DISK GROUP STATUS
c1t0d0s2 auto:sliced rootdisk rootdg online
c1t1d0s2 auto:cdsdisk data100 data1 online
c1t2d0s2 auto:cdsdisk data101 data1 online
c1t3d0s2 auto:sliced rootmirror rootdg online
c1t4d0s2 auto:cdsdisk data102 data1 online
c1t5d0s2 auto:cdsdisk data103 data1 online


These disks are 73GB each and configuring four of them in a RAID5 volume should yield around 216GB of data space. But when I try to see what the maxsize of the volume that I can create is, the results are much less than the 216GB capacity that it should be. Why is it only showing that I have 140GB available for RAID5?

# vxassist -g data1 maxsize layout=raid5 ncol=3
Maximum volume size: 286693376 (139987Mb)

this also produces the same result

# vxassist -g data1 maxsize layout=raid5
Maximum volume size: 286693376 (139987Mb)

thanks for your help

 

[achech]

If I remembered right, it should be ncol=4 but 3...

ncol=3 should means 2 data disks + 1 partition disk, so you only get around 120GB space usable, and that's what you got on the screen.

Havn't use VxVM for 5 years, forgive me if I'm wrong.


Cheers,

Achech

 

[telemorgan]

That was it, thanks

vxassist -g data1 maxsize layout=raid5 ncol=4 nlog=0