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Message from discussion Why does ASMLib support linux platform only?
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Toni Schmidbauer  
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 More options Apr 16 2008, 6:38 pm
Newsgroups: comp.databases.oracle.server
From: Toni Schmidbauer <t...@stderror.at>
Date: Thu, 17 Apr 2008 00:38:49 +0200
Local: Wed, Apr 16 2008 6:38 pm
Subject: Re: Why does ASMLib support linux platform only?
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At Mon, 14 Apr 2008 20:44:48 -0700 (PDT),

Woody Ling wrote:
> I read many articles which said that ASMLib disk can provide better
> performance and easy of management than using RAW devices to form ASM
> disk group. Why does ASMLib support linux platform only if it is
> better? Raw devices are good enough for building ASM disk grouop in
> other platforms such as AIX?

don't know about performance, but i think the main reason for asmlib
is/was persistent device naming under linux. in pre 2.6/udev times
there was now way to pin down a certain scsi lun to a fixed /dev
entry.

for example if you had 3 scsi disks sda, sdb and sdc and you removed
sdb, on the subsequent reboot device sdc would become sdb. which is
quite a nightmare for the admin.

also with asmlib you do not need to configure raw devices, which makes
life even more convenient.

nowadays, with the help of udev and O_DIRECT used by oracle its not
strict necessary to use asmlib under linux, imho.

hth
toni
--
If you understand what you're doing, you're | toni at stderror dot at
not learning anything.                      | Toni Schmidbauer
-- Anonymous                                |


 
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