Re: Trying to get ASM disks under asmlib rather than system

From: Alex Gorbachev <>
Date: Wed, 2 Apr 2008 09:39:29 -0400
Message-Id: <>


To paraphrase, "you probably don't need" ASMLib.

Back to you initial question, what do you see in v$asm_disk when you set asm_diskstring="ORCL:*"?

Btw, you don't need to bounce ASM instance at that change - unmount DG + set asm_diskstring + mount DG.


On 2-Apr-08, at 8:41 AM, Don Seiler wrote:

> hey Frits, your blog came up many times in my googling last night ;)
> See replies inline below.
> On Wed, Apr 2, 2008 at 3:51 AM, Frits Hoogland <
> > wrote:
>> btw, any reason you want asmlib disks?
> The only "reason" (if you can call it that) is that Oracle seems to
> push it so hard for linux. However we do have a whitepaper from
> Symantec on setting up Veritas and ASM without asmlib, so we'll
> probably go that route when we get a chance to redo it all.
>> asmlib disks mean you have a kernel dependency.
>> I have investigated the technical reasons for using it, and the
>> only reason
>> I can find for using asmlib disks so far is asmlib is claimed (by
>> oracle) to
>> use lesser system resources, the slab kernel resources for using aio
>> (writing to asmlib meta devices is done synchronous (see the next
>> blog about
>> this), the kernel module writes asynchronous.
> Yes those same claims are the siren song that lured me to asmlib. As
> I said, we'll probably try a setup without asmlib when we get a chance
> in a few weeks. I just wondering (hoping?) that there might be a fix
> for my foul-up.
> --
> Don Seiler
> ultimate:
> --

Received on Wed Apr 02 2008 - 08:39:29 CDT

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