From: Dirk Bönning (dirk.boenning@ccf.de)
Date: Mon Nov 18 2002 - 11:33:09 EST
Hello,
here's the summary:
Original Question:
Hello,
>
> yes, you got the subject right.
> One of our customers want to know, if it's possible to stripe Mirrors
> (call it Raid 1+0). I tried the GUI of SDS and it didn't work. Could
> anybody confirm/defirm that it will work under SDS command line or if
> this is even possible under Veritas or any other Product ?
>
> TIA, Dirk.
Very short version:
-Yes Raid 1+0 exists.
-Yes plain Raid 1+0 is more reliable than plain Raid 0+1
-Yes Veritas do it since 3.11
-Yes SDS do it also (even it's better to call it intelligent Raid 1+0)
Longer version:
I got a big reply and these replies ranges from NO AT ALL upto YES, for
sure. So I'm not alone in the world of Raid confusion ;-)
The best overview of Raid 0+1 versa Raid 1+0 could be found at:
http://www.pcguide.com/ref/hdd/perf/raid/levels/multXY-c.html
But please remember they just talking 'bout the plain concepts.
Veritas can do Raid 1+0, but just since Version 3.11. In veritas slang
they are called StripePro.
Now what's 'bout SDS ?
Most people anwsered that SDS can't handle it. Then I got a link to a
Sun site which gives the following statement:
>Solstice DiskSuite software intelligently provides RAID 1 + 0
>capabilities when the underlying devices are identical physical disks,
>but provides RAID 0 + 1 when, as in the case of network storage
>devices, logical devices can support internal redundancy.
Cause not believing anything I read, I start testing myself with SDS, 4
disks and a long list of different failures scenarios. The result:
Yes, it's true. SDS delivers the reliabilty of Raid 1+0, even if it's
more an kind of intelligent Raid 0+1. I'm able to expand the Sun
statement to "identical physical partitions (no need for the whole disk!)".
Hope it helps to minimize the confusion.
CU, Dirk.
-- CCF AG Dirk Bvnning Daimlerstrasse 10 D-64347 Griesheim t. +49 (0)6155/6668-38 f. +49 (0)6155/6668-68 e. dirk.boenning@ccf.de w. www.ccf.de _______________________________________________ sunmanagers mailing list sunmanagers@sunmanagers.org http://www.sunmanagers.org/mailman/listinfo/sunmanagers
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