LVM Stripe AND Mirror

[Peter Heidbreder]

As far as I know they are mutially exclusive. You can do one or the other and I generally recommend that you would use hardware mirroring on your array.

My customer is apparently doing this with Veritas. Is there a way to do this with LVM.

[James R. Ferguson · Accepted solution]

Hi Peter:

No, with LVM, true striping and mirroring are mutually exclusive. The closest you can get is to use extent-based mirrored stripes. See the manpages for 'lvcreate(1M)' for more information.

Regards!

...JRF...

[Peter Heidbreder]

James:

Thanks for the reply. I will need to see if that will work for them. They want to have the performance of stripes but want to have the mirror on a separate array to eliminate the array being a single point of failure.

[Mridul Shrivastava]

As being mentioned by james, in LVM extent based stripe is possible.Let me explain briefly:
We need to create volume groups using pvg, pvg can be created using -g option with vgcreate or by editing /etc/lvmpvg.

Then while creating LV's we need to make sure that we enable strict distribution policy using the following options with lvcreate command:

lvcreate -D y -s g < lv name>

then if we do mirror it will extend to PVG2. Make sure that each PVG contains at least two disks.

I hope this clarifies a little bit more....