Re: [gentoo-user] Re: Strategy for using SAN/NAS for storage with Gentoo...

[Florian Philipp <lists@f_philipp.fastmail.net>]

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Am 16.03.2010 22:26, schrieb Neil Bothwick:
> On Tue, 16 Mar 2010 20:13:29 +0000, Stroller wrote:
> 
>>>> How does your system boot if your RAID1 system volume fails?  
>>>
>>> You put GRUB on both disks, then you can boot from either on its
>>> own.  
>>
>> Is this reliable? I don't contest it, I'm just asking. It's just this  
>> was one of my considerations when choosing hardware RAID.
> 
> Yes it is, if sda fails unplug it and sdb becomes sda (or hd1 becomes
> hd0 in GRUB terms) and the boot continues. Because RAID1 puts the RAID
> superblock in a different location from the ordinary one, you can use
> either disk from a RAID1 array as a single disk.
> 
> 

Just for clarification: Is it really necessary to unplug the broken disk
for this to work?
If read access fails on sda and the BIOS tries sdb, would this also
work? Isn't grub's hd0 always the disk on which grub resides (e.g. the
disk from which grub managed to boot)?

Thanks in advance!
Florian Philipp


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