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	Sat, 10 Dec 2005 11:34:23 GMT
Date: Sat, 10 Dec 2005 11:34:23 +0000 (GMT)
From: Carlos Benkendorf <carlosbenkendorf@yahoo.com.br>
Subject: Is RAID10 the best choice?
To: pgsql-performance@postgresql.org
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Hello,
   
  I would like to know which is the best configuration to use 4 scsi drives with a pg 8.1 server.
   
  Configuring them as a RAID10 set seems a good choice but now I´m figuring another configuration:
SCSI drive 1: operational system
SCSI drive 2: pg_xlog
SCSI drive 3: data
SCSI drive 4: index
   
  I know the difference between them when you analyze risks of loosing data but how about performance?
   
  What should be better?
   
  Obs.: Our system uses always an index for every access.. (enable_seqscan(false))
   
  Thanks in advance!
   
  Benkendorf

		
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<DIV id=RTEContent>Hello,</DIV>  <DIV>&nbsp;</DIV>  <DIV>I would like to know which is the best configuration to use 4 scsi drives with a pg 8.1 server.</DIV>  <DIV>&nbsp;</DIV>  <DIV>Configuring them as a RAID10 set seems a good choice but now I´m figuring another configuration:<BR>SCSI drive 1: operational system<BR>SCSI drive 2: pg_xlog<BR>SCSI drive 3: data<BR>SCSI drive 4: index</DIV>  <DIV>&nbsp;</DIV>  <DIV>I know the difference between them when you analyze risks of loosing data but how about performance?</DIV>  <DIV>&nbsp;</DIV>  <DIV>What should be better?</DIV>  <DIV>&nbsp;</DIV>  <DIV>Obs.: Our system uses always an index for every access.. (enable_seqscan(false))</DIV>  <DIV>&nbsp;</DIV>  <DIV>Thanks in advance!</DIV>  <DIV>&nbsp;</DIV>  <DIV>Benkendorf</DIV><p>
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