Karim Nassar wrote:

Thanks to all for the tips.


In general I would recommend RAID1, because that is the safe bet. If your db is the bottleneck, and your data isn't all that critical, and you are read heavy, I would probably go with RAID1, if you are write

                                                ^^^^^ -> RAID0

heavy I would say 2 independent disks.

I feel that we have enough data safety such that I want to go for speed. Some of the queries are very large joins, and I am going for pure throughput at this point - unless someone can find a hole in my backup tactic.

Of course, later we will have money to throw at more spindles. But for
now, I am trying gaze in to the future and maximize my current

Seems to me that the "best" solution would be:

* disk 0 partition 1..n - os mounts
        partition n+1  - /var/lib/postgres/data/pg_xlog

* disk 1 partition 1    - /var/lib/postgres/data

* Further (safe) performance gains can be had by adding more spindles as
such: - first disk: RAID1 to disk 1
- next 2 disks: RAID 0 across the above

Sounds decent to me.
I did make the mistake that you might want to consider a RAID0. But the performance gains might be small, and you potentially lose everything.
But your update strategy seems dead on.

Do I grok it?

Thanks again,

John =:->

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