I am currently specing a 2U dual Xeon server and hope to use RAID 0+1 capability. The question is for PostgreSQL admins...
1) Which RAID controller should we use?
You haven't mentioned whether you plan to use SCSI or IDE drives. The PERC RAID controller in Dell's PowerEdge's works quite well for the former, but you might consider the 3ware twe if you're doing IDE.
2) Considering Q1, does it not even make sense to use FreeBSD+PostgreSQL
and bite the bullet and go with Linux (assuming it has better hw RAID
support) and run PostgreSQL on that using a fancier journaling filesystem.
Hmm. What makes you think that a journalling filesystem gains you much when you are running a database?
Databases do their own transaction management using two-phase commit and logfiles for rollback in case of a crash using a few very large files, which they'll write to directly using async/directIO (whatever the term you wish to use is), rather than using OS/filesystem buffering....
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