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Redo log Files and RAID5 [message #215010] Thu, 18 January 2007 22:28 Go to next message
M.Shakeel Azeem
Messages: 226
Registered: September 2006
Senior Member
Can anybody tell me
Why it is not recommended not to put Redo Log Files on RAID5?

Thanx in Advance
Re: Redo log Files and RAID5 [message #215012 is a reply to message #215010] Thu, 18 January 2007 22:35 Go to previous message
BlackSwan
Messages: 25036
Registered: January 2009
Location: SoCal
Senior Member
REDO are heavily WRITE intensive.
With RAID-5 for EVERY data block written, the RAID-5 volume must (re)write the XOR block with updated information.
In other words it doubles the write activity to the RAID-5 volume.
Simply put is does not scale well.
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