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Re: XSan 2

Subject: Re: XSan 2
From: André Aulich <email@hidden>
Date: Wed, 14 May 2008 08:42:19 +0200
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Hi there,

if you use Apple's standard config script to set up an Xsan
metadata/data RAID (can be found here:
http://support.apple.com/kb/HT1160),
the lines

array -a add -p 1,2 -s "alias=MDC" -c 1 -l "alias = MDC,raid=1,readpolicy=readcache,writepolicy=writethru,preferredctrlid=1" array -a add -p 5,6,9,10,13,14 -s "alias=Data1" -c 1 -l "alias = Data1 ,raid=5,readpolicy=readahead,writepolicy=writeback,preferredctrlid=2"

array -a add -p 7,8,11,12,15,16 -s "alias=Data2" -c 1 -l "alias = Data2 ,raid=5,readpolicy=readahead,writepolicy=writeback,preferredctrlid=1"

build one metadata and two user data LUNs.

The metadata LUN and the Data2 LUN are managed by

controller 1, Data1 is managed by controller 2.

So no dedicated metadata controller anymore.

André


On 14.05.2008, at 03:29, TechTalk wrote:

On 13-May-08, at 5:16 AM, Christopher Dwan wrote:
* Under XSan 1, you were expected to dedicate an entire RAID controller to the metadata partition. This meant that for small (single XRAID) configurations, you immediately lost a major portion of the available storage. On a single XRAID setup, you lost 50% of the notional storage capacity.
One of the advantages of the new Promise RAIDs is, as I understand it, that one controller can control almost all over the drives/ arrays and the other can be dedicated to the metadata LUN. So no lost drives (unless you want hot spares). Or you can use all the drives/arrays in the Promise and use an older Xserve RAID for metadata.

I have not received a unit yet for testing... But I will soon. Then we'll see.
:)
Mat X
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--
André Aulich
Apple Server & Storage Solutions
http://www.andre-aulich.de

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References:
	>XSan 2 (From: Christopher Dwan <email@hidden>)
	>Re: XSan 2 (From: TechTalk <email@hidden>)

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