Re: In this partition scheme, grub does not find md information?

[Bill Davidsen <davidsen@tmr.com>]

Moshe Yudkowsky wrote:
> Keld Jørn Simonsen wrote:
>> On Tue, Jan 29, 2008 at 06:32:54PM -0600, Moshe Yudkowsky wrote:
>>>> Hmm, why would you put swap on a raid10? I would in a production
>>>> environment always put it on separate swap partitions, possibly a 
>>>> number,
>>>> given that a number of drives are available.
>>> In a production server, however, I'd use swap on RAID in order to 
>>> prevent server downtime if a disk fails -- a suddenly bad swap can 
>>> easily (will absolutely?) cause the server to crash (even though you 
>>> can boot the server up again afterwards on the surviving swap 
>>> partitions).
>>
>> I see. Which file system type would be good for this?
>> I normally use XFS but maybe other FS is better, given that swap is used
>> very randomly 8read/write).
>>
>> Will a bad swap crash the system?
>
> Well, Peter says it will, and that's good enough for me. :-)
>
I've done unplanned research into this, it will crash the system, and if 
you're unlucky some part of what's needed for a graceful crash will be 
swapped out :-(
> As for which file system: I would use fdisk to partition the md disk 
> and then use mkswap on the partition to make it into a swap partition. 
> It's a naive approach but I suspect it's almost certainly the correct 
> one.
>
I generally dedicate a partition of each drive to swap, but the type is 
"raid array." Then I create a raid10 on that set of partitions and 
mkswap on the md device. While raid10 is fast and reliable, raid[56] 
have similar reliability and a higher usable space from any given 
configuration.

-- 
Bill Davidsen <davidsen@tmr.com>
  "Woe unto the statesman who makes war without a reason that will still
  be valid when the war is over..." Otto von Bismark 



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