I have one RAID 1+0 array available. My primary concern is data integrity.
The general instruction is to put pg_xlog on another filesystem, seperated
physically from the database files, for maximum performance. That is what I had
planned on doing. However, it dawned on me that there could be a serious
problem if the pg_xlog got corrupted or was lost in a hardware failure. It
might not matter one bit that the actual data files are safe and sound if the
transaction log is corrupted.
Is protecting pg_xlog as important as protecting the rest of the data files?
Will the performance hit, which happens when one keeps pg_xlog on the same
filesystem as the database, be substantial enough to warrant spending more
money on another array of drives to use for pg_xlog?
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