In which case, which is theoretically better (since I don't have a
convenient test bed at the moment) for WAL in a write-heavy environment?
More disks in a RAID 10 (which should theoretically improve write
throughput in general, to a point) or a 2-disk RAID 1? Does it become a
price/performance question, or is there virtually no benefit to throwing
more disks at RAID 10 for WAL if you turn off journaling on the filesystem?
Over 4 drives, I would gather that RAID 10 wouldn't gain you anything.
Possibly over 6 or 8 however, it may be faster because you are writing
smaller chunks of data, even if two copies of each.
Sincerely,
Joshua D. Drake
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