WAL+Os on a single disk

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I have a situation where we are limited by the chassis on the box (and cost).

We have a 12 x 600G hot swappable disk system (raid 10)
and 2 internal disk  ( 2x 146G)

We would like to maximize storage on the large disks .

Does it make sense to put the WAL and OS on the internal disks and use
the 12 large disks only for data or should we put the WAL along with
data and leave the OS on the internal disks.

On our current systems..everything is on a single RAID 10 volume (and
performance is good)

We are just considering options now that we have the 2 extra disks to spare.

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