Re: EMC question

From: Gaja Krishna Vaidyanatha <oraperfman_at_yahoo.com>
Date: Mon, 01 Apr 2002 15:38:22 -0800
Message-ID: <F001.00438542.20020401153822@fatcity.com>

Waleed & list,

I researched this issue recently and found out that the meta volume was "concatenating a bunch of hyper volume". As you know, concatenation is NOT striping. The hyper volumes get filled with data one after another, eventually giving you the "simulation of a striped volume", when all hypers are filled with data.

I don't know about the "single-host vs. multi-host" addressibility issue. There are plans for supporting "true striped volumes" in microcode level 68 or 69.
>From some "reliable sources" that does not look like
it will happen any time soon. So until then, you should consider created mirrored hyper volumes within EMC (RAID 1) and then create a striped volume using Veritas Volume Manager, giving you a RAID 1+0 configuration, which is ideal.

Best regards,

Gaja

• "Khedr, Waleed" <Waleed.Khedr_at_FMR.COM> wrote:
  > Four years ago the only hardware striping available
  > on EMC I was aware of
  > was RAID-S.
  > Recently researching striping ideas on EMC and was
  > told that we can achieve
  > raid0+1 hardware striping on EMC.
  >
  > I was told that EMC has some layer called
  > meta-volume that is made of many
  > other hyper-volumes.
  >
  > Told also that meta-volumes could be raid-0
  > (striped) and it's not a
  > single-host addressable volume.
  >
  > Does anybody know anything about this? Can we really
  > get a hardware striped
  > volume using EMC?
  >
  > Any limitations there?
  >
  > Thanks.
  >
  >
  > Waleed
  >
  >
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Gaja Krishna Vaidyanatha
Director, Storage Management Products,
Quest Software, Inc.
Co-author - Oracle Performance Tuning 101 http://www.osborne.com/database_erp/0072131454/0072131454.shtml

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Received on Mon Apr 01 2002 - 17:38:22 CST