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RE: EMC question

From: Gaja Krishna Vaidyanatha <oraperfman_at_yahoo.com>
Date: Tue, 02 Apr 2002 15:28:24 -0800
Message-ID: <F001.0043960F.20020402152824@fatcity.com>


Hi Waleed & list,

The issue I raised about "queuing" was within the context of sequential writes to the various "stripe units" within a striped volume. If you have a 4-way stripe and there are 4 dirty disk blocks (1 on each stripe unit) that needs to be written to each of the 4 disks, the LVM-mid-layer should be able to get them down to their respective disks, independent of one another, not one after the other. If the dirty disk blocks are not written independent of one another, there will be no advantage of "striping" for writes. And "pure striping" should cater to I/O scalability for both reads and writes.

Regards,

Gaja


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 Tue Apr 02 2002 - 17:28:24 CST

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