[CentOS] problem with swap and upgrade to 4 from 3.3

Peter Farrow peter at farrows.org
Fri May 6 22:09:32 UTC 2005


Hi There,

Yes I agree, I always raid the swap.....when the original install was 
done a staff member (who I have now fired :-) ) did not raid the swap 
partitions at install time, leaving me with this problem after raiding 
them subsequently

P.


Joshua Baker-LePain wrote:

>On Fri, 6 May 2005 at 9:03am, Daniel J. Cody wrote
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>>Hey Peter,
>>    
>>
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>>>I guess I could set the swap back to an unmirrored set, run the upgrade 
>>>from the CDs then mirror it again, but this is not ideal, does anyone 
>>>have any suggestions as to how to fix this little RAID niggle with the 
>>>swap caused by not RAIDing the swap parition originally on install?
>>>      
>>>
>>I wouldn't personally recommend using software raid on swap partitions 
>>since it causes all sorts of problems like you're describing. If you 
>>want to get raid type performance from your swap partitions, I'd suggest 
>>just letting the kernel itself handle that.
>>    
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>
>The main purpose of putting swap on a mirrored array is not performance.  
>It allows the system to stay up and running should a disk fail.  Mirroring 
>the system disk is pretty much pointless if the system is going to die 
>upon losing a disk anyway b/c half the swap is now gone.
>
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