creating new VG with one LVOL

[Paul Sperry]

I have three external disks.
I want to create one new volume group with
one logical volume. The lv is going to be used for a large Oracle DB. would the following be optimal for the volume?

mkdir /dev/vg#1
mknod /dev/vg#1/group c 64 0x010000
pvcreate /dev/rdsk/c#t#d#
pvcreate /dev/rdsk/c#t#d#
pvcreate /dev/rdsk/c#t#d#
vgcreate /dev/vg#1 /dev/rdsk/c#t#d# /dev/rdsk/c#t#d# /dev/rdsk/c#t#d#
lvcreate -L 24000 -i 3 -I 64 -n datavol /dev/vg#1
newfs -F vxfs -o largefiles /dev/vg#1/datavol

[John Poff · Accepted solution]

Hi,

It looks good to me. Depending on the capacity of your disks you might have to bump up the PE size when you create your volume group. What kind of disk array and disks are you going to use?

JP

[Pete Randall]

Paul,

Not knowing what size disks you're using, I would recommend bumping up the PE size in your vgcreate command so that you can use all the space.

Pete

[Paul Sperry]

Thanks
they are 9GB IBM Drives

[James R. Ferguson]

Hi:

Syntatically this is fine. You might want to consider using distributed extents instead of true stipes. The former allows you the capability of mirroring and striping while true striping does not.

Make sure, too, that your volume group parameters ('max_pe', 'max_pv', etc.) are adequate to support any growth or addition of disks later.

Regards!

...JRF...

[Paul Sperry]

Thanks for all the great input

[Rammig Claus]

Hi,

I would make two changes:

vgcreate -s 64 ...
-> extendsize = 64MB

newfs -F vxfs -b 8192 ..
-> Fragmentsize, this should have the same size as the Oracle-Blocksize

If you plan, to add larger disks in the future, check the max_pe_extends. You can change the amount with the option
vgcreate -e ...

Gruesse
Claus