Re: ASM/MetaLUN

I will say this, as part of our 10g software support, we basically worked with every single feature in 10g and ran it through its paces. 10g was so buggy that we were finding new bugs on an average of one a day. The only part of 10g that worked flawlessly out of the box was ASM. We have yet to see a single crash or issue related to ASM on 10g, though admittedly, we haven't tested all of the availability group functionality and so-such.

That being said, I always think its a better idea to leave mirroring and redundancy to the hardware, and use a host side volume manager (like asm) for management only. Striping on the host side is okay, too. ASM, though, doesn't have a particularly elegant algorithm for laying out data. It uses 1meg chunks and evenly distributes all I/O - there was talk of it doing hotspot detection I remember hearing, but I have yet to see ASM take action to adjust for hotspots.

Thanks,
Matt

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Matthew Zito
GridApp Systems
Email: mzito_at_gridapp.com
Cell: 646-220-3551
Phone: 212-358-8211 x 359
http://www.gridapp.com


On Dec 23, 2004, at 1:43 PM, Jared Still wrote:



> ASM is still rather bleeding edge.

>

> If you're considering this for production use you may want to wait for 

> 10gR2.

>

> Jared

>

>

> On Thu, 23 Dec 2004 11:21:55 -0500, Henry Poras 

> <henry_at_itasoftware.com> wrote:

>> I have been reading through some EMC docs as well as Oracle ASM stuff,

>> trying to understand what would be a reasonable setup (the recent 

>> Storage

> ...

>

>

> -- 

> Jared Still

> Certifiable Oracle DBA and Part Time Perl Evangelist

> --

> http://www.freelists.org/webpage/oracle-l


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