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JSF versions ? and how do I create > 128GB LVs

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Norm Bryk
Occasional Visitor

JSF versions ? and how do I create > 128GB LVs

How do I find which version of JFS I am using.
How do I create > 128GB logical volumes.
2 REPLIES
Helen French
Honored Contributor
Solution

Re: JSF versions ? and how do I create > 128GB LVs

1) To find out the JFS version:

# swlist -lfileset | grep JFS
# fstyp -v /dev/vg??/lvol? ( to find FS version of a particular lv)

2) To increase the LV size, you need to increase the PE (physical extent) size. The default physical extent size is 4MB and thus the calculation:

LV size = PE size X max. number of extents per volume.

The max. number of extents per LV is fixed at 65535 (man lvcreate(1m)).So the LV size will be 256GB max. To increase this, increase the PE size (to a power of 2) range from 1MB to 256MB. Use -s option with vgcreate to set the pe_size for a VG
Life is a promise, fulfill it!
Norm Bryk
Occasional Visitor

Re: JSF versions ? and how do I create > 128GB LVs

Hi Shiju
thanks for your help,
I got these drives up and working with an LV of 286GB.

seems to me that I was trying to do this thru SAM and Sam won't do it.

Sam allowed me to create LV of 130GB, then I had to manually lvextend and extendfs to get the 286GB.