[Lustre-discuss] Replacing An Existing OST with a bigger one (unsupported optional features)?!

[Alex]

> > [root at shd1 ~]# mount
> > ...
> > /dev/hdb2 on /mnt/lustre/ost1_02 type lustre (rw,_netdev)
> > /dev/hdb1 on /mnt/lustre/ost1_01 type lustre (rw,_netdev)
>
> So it appears that you have a single disk (hdb) partitioned into at
> least 2 partitions with partition 1 being ~18G and partition 2 likely
> being ~18G as well.  I'm wondering why.  Are there any more partitions
> on hdb?
>
> There is usually no advantage (and with some hardware there is even a
> disadvantage) to making partitions on a disk to be used as OSTs in the
> same Lustre filesystem except for limiting them to the 8TiB max. OST
> limit.
>
> If you want to use the entirety of a disk for an OST or MDT, usually you
> can just use the whole disk device (i.e. /dev/hdb) and dispense with the
> whole partitioning mess altogether.

Hi Brian,

You are very vigilantly with my setup :-) ... You are absolutely right! I am 
using 2 slices because i am learning/testing Lustre and i don't have enough 
equipments and hard disks in order to add more OSTs, so i used one disk with 
2 partitions to emulate somehow the second OST :-)). Indeed, i agree with 
you: on production this setup should be avoided. Thanks again. You are a nice 
guy ;-)

Regards,
Alx