Re: ASM on Linux 6

From: David Robillard <>
Date: Sat, 23 Apr 2011 15:19:32 -0400
Message-ID: <>

> This seems to be a very serious situation for us: I think a call to my Oracle
> Sales Rep for a strongly worded protest is in order.

Why use ASMLib in the first place?

Of course the official ASM documentation [1] says that if you're running Linux, then use the Oracle ASMLIB feature to provide consistent device naming and permission persistency. But you can achieve the same goal with udev instead of ASMLib [2]. Don't take my word for it and check out Christo Kutrovsky's presentation RAC+ASM: 3 years in
production. Stories to share [3] in which he also suggests to drop ASMLib in favor of udev.

The main reason I don't like ASMLib is because it has to be kept in sync with your kernel version. So every time you do a kernel upgrade, you have to fiddle with ASMLib otherwise your node can't see the disks. While udev is part of the base OS and so it's a lot easier to manage. Yes, writing udev rules can be complex and ASMLib is a bit more simple to use. But once the udev rules have been written, adding a new LUN is very easy.

HTH, David



> -----Original Message-----
> From: [] On
> Behalf Of Gillfillan, Marianne J.
> Sent: Wednesday, April 20, 2011 7:54 AM
> To:
> Subject: ASM on Linux 6
> Did anyone else see the announcement from Oracle that they will not be providing
> ASMlib for kernels distributed by RH as part of RHEL 6, only for Oracle
> kernels? See Metalink Note 1089399.1:
> "For RHEL6, Oracle will only provide ASMLib software and updates when configured
> with a kernel distributed by Oracle. Oracle will not provide ASMLib packages for
> kernels distributed by Red Hat as part of RHEL6. ASMLib updates will be
> delivered via Unbreakable Linux Network(ULN) which is available to customers
> with Oracle Linux support. ULN works with both Oracle Linux or Red Hat Linux
> installations, but ASMlib usage will require replacing any Red Hat kernel with a
> kernel provided by Oracle."
> To me, this sounds like Oracle is forcing all ASM Linux sites to buy into their
> support structure and drop RH support. When we investigated the cost between RH
> and Oracle Linux support, we found Oracle Linux to be more expensive than RH
> (when comparing apples to apples). For those on an already tight budget, this
> is not going to sit well.
> I had also heard that this may have something to do with RedHat's decision to
> pre-bundle patches in the kernel, making it more difficult for Oracle to provide
> Red Hat support (and take away customers from Red Hat support):
> If that's the reason, it's going to backfire on RedHat as all those running ASM
> on Linux will have to flip to Oracle Support just to be able to download ASMlib
> updates. They'll end up losing customers anyway. The only other option is for
> ASM customers to drop the use of ASM and lose all the great functionality it
> provides. Tough decisions ahead, I believe.
> Marianne
> Marianne Gillfillan, OCA
> CAIS Technical DBA
> --
Received on Sat Apr 23 2011 - 14:19:32 CDT

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