RE: EMC striping question

From: Khedr, Waleed <Waleed.Khedr_at_FMR.COM>
Date: Fri, 03 Oct 2003 06:59:25 -0800
Message-ID: <F001.005D1F4C.20031003065925@fatcity.com>

This could be true on the request level. But it will not stop it from pipelining other requests on the spindle level, so that when spindle A is done for request 1 it works on request 2. This increases the overall throughput of the system.
Then using Async IO should help here.

I'm talking about EMC raid 0+1 hardware striping, if you are talking about RAID-S, this will be a different story because the parity bits needs to be maintained.

Regards,

Waleed

-----Original Message-----
Sent: Friday, October 03, 2003 9:50 AM
To: Multiple recipients of list ORACLE-L

Hi All,

Today I saw an archived thread on orafaq about striped volumes in an EMC Symmetrix. Gaja mentioned that writing to a striped volume is performed in a

sequential fashion i.e. spindle B will not start writing block 2 before spindle A has completed writing block 1.

Is this still true for a Symmetrix with 5568 firmware? Perhaps it's a better idea to let the OS handle the striping?

Regards,
Hans de Git

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Author: Hans de Git
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Author: Khedr, Waleed
  INET: Waleed.Khedr_at_FMR.COM

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To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). Received on Fri Oct 03 2003 - 09:59:25 CDT