In the advanced administration and troubleshooting guide netapp indeed points out that a raidgroup should not have less than three data disks. Otherwise you will have a decrease in performance especially with read/write of large files. It has to do with the wafl striping mechanism but unfortunately the explanation in this guide is quite marginal. Perhaps someone from netapp can give us a more detailed answer?
thorsten
arden@nortelnetworks.com@mathworks.com on 23.07.2003 19:02:07
Sent by: owner-toasters@mathworks.com
To: toasters@mathworks.com cc: Subject: Mirroring using raidsize=2
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Our company (in its wisdom) has decided that all "critcal" data must be on mirrored filesystems, not on raid.
On filers, if you set the raidsize to 2, you effectively get a mirrored volume.
Does anyone do this? Does it cause a performance problem? Is there a limit on the number of raid groups in a volume?
- Bruce
-- Bruce Arden arden@nortelnetworks.com barden2@csc.com CSC, Nortel, London Rd, Harlow, England +44 1279 40 2877