RE: EMC question

This is true - but then again... raw doesn't cost anything... ...Quick IO and cached Quick IO do :-) I only raise the point because in these days of lvm's (gui and/or otherwise) and enterprise backup products, I often fail to see the managment difficulties with raw devices. Cheers Connor ---

RE: EMC question

-Original Message- From: Connor McDonald [mailto:[EMAIL PROTECTED]] Sent: Thursday, April 04, 2002 6:53 AM To: Multiple recipients of list ORACLE-L Subject: RE: EMC question This is true - but then again... raw doesn't cost anything... Unless you buy it from certain company

RE: EMC question

I don't want to start a technical religious war here. Nevertheles, I am not a great fan of raw devices especially after the advent of comparable I/O options such as Direct I/O within Oracle which allows you to keep your file system layout and yet have raw device comparable performance. Plus

RE: EMC question

No wars! I also agree there are good products out there. But the question will be: can these products offer striping for Oracle OPS/RAC? Using EMC striping would allow this, I believe! note: I'm not working for EMC Regards, Waleed Any views or opinions presented in this email are solely

RE: EMC question

Hello, If you want to use OPS/RAC, I suggest you go with something like an HP-256 disk array (or bigger, depending on your needs; a 256 is good for 1-2 terabytes and can be easily increased); and use mirroring and business copies. Caveat to the above: this is only good for read-intensive, not

RE: EMC question

It looks like it's available now. This is from: ResourcePak for Windows Version 3.2 Product Guide Symmetrix Microcode level 5x65 includes support for concatenated (contiguous) and striped metavolumes. Noncontiguous metavolumes (including striped) require EMC Enginuity(tm) (5x66 microcode) or

RE: EMC question

Waleed list, To define the terms we have on hand:- A contiguous meta volume requires the hyper volumes to be sequential. A non-contiguous does not require the hyper volumes to be sequential. I want to reiterate again that the concept of pure striping at the hardware level, is still not there

RE: EMC question

HI Gaja list, I am trying to find the truth here! I was told by the storage group that EMC has striping now and this what I'm researching. Gaja, what you described as a problem during WRITES to striped EMC is a typical procedure in any striped volumes. There is a mid layer that has to map

RE: EMC question

Take a look at this pdf file and search for 'microcode 5265' : http://powerlink.emc.com/MediumFreq/21108_Symmetrix_3832_Installation_Manual .pdf?_requestid=260 Regards, Waleed Any views or opinions presented in this email are solely those of the author and do not necessarily represent

RE: EMC question

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

RE: EMC question

So it's great that EMC is offering striping on the hardware level that should be good idea for implementing striped raw device. -Original Message- To: Multiple recipients of list ORACLE-L Sent: 4/2/02 6:28 PM Hi Waleed list, The issue I raised about queuing was within the context of

Re: EMC question

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