Re: Software Raid 5

What is AOE devices?
If  Raid 5 is possible as you describe it, then DRBD will not make much 
sense, would it?


----- Original Message ----- 
From: "Brown, Larry" <[email protected]>
To: "Ed King" <[email protected]>
Cc: <[email protected]>
Sent: Monday, June 19, 2006 7:40 PM
Subject: [Norton AntiSpam] Re: [SSI-users] Software Raid 5


> My apologies, I should have been more specific.  I have also come across
> a number of posts touching on software raid.  I was referring to
> inter-node software raid IE:
>
> md0
> /dev/1/hda2
> /dev/2/hda2
> /dev/3/hda2
> /dev/4/hda2
>
> Where loss of node 1 would not constitute loss of the cluster.  If this
> is not possible with the md code that is in the kernel due to the
> underlying architectural changes, is it possible to do this with AOE
> devices?
>
>
> Larry Brown
>
> -----Original Message-----
> From: Ed King [mailto:[email protected]]
> Sent: Monday, June 19, 2006 1:27 PM
> To: Brown, Larry
> Cc: [email protected]
> Subject: Re: [SSI-users] Software Raid 5
>
> If you want the root to be fault tolerant, a standard debian
> installation allows this (Sarge 3.1).
>
> We partition each drive with a small boot partition (~50MB) , some swap
> space (1GB) and the rest being allocated for RAID.
>
> The installer is told that the first drive, first partition is mounted
> as boot, the other primary partitions on the other drives are not
> designated to be mounted (the debian installer can't have more than one
> drive mounted to the boot point).
>
> The installer allows the creation of the raid, and we flag that as
> mounting as the root filesystem -- it gives us a very large software
> raid, and on the faster processors can actually give better performance
> than hardware raids.  The boot partition never changes (unless we
> upgrade the kernel) and is small enough so we use dd to copy it over to
> the other unused partitions so all the drives are now bootable.
>
> Brown, Larry wrote:
>> OK, I'm going to ask a stupid question.  I'm sure I must have run
>> across this in the past but can't find any mention of it now...
>>
>> Is it possible to allow a small group of nodes to boot to an init node
>
>> where the init node is still running off initrd, mount their disks
>> with software raid, and pivot root over to them allowing the root
>> filesystem to be fault tolerant with software raid 5?
>>
>> Larry Brown
>>
>>
>>
>>
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>>
>>
>
>
>
>
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