[Gllug] To partition or not to partition

[John Edwards]

On Wed, Oct 13, 2010 at 11:17:24AM +0100, Alain Williams wrote:
<snip> 
> The way that I look at it is:
> 
> * Disk is cheap - the cost of allocating bucket loads of disk for swap is cheap.
> * With RAID 1 - the cost of twice cheap is still cheap.
> * The cost of downtime due to a disk failing is going to be higher than cheap.
> 
> * If stuff gets swapped out and stays there. The cost of getting it there is cheap.
> * If stuff swaps in & out a lot: what is (for you) the cost in terms of lost performance
>   against the cost of more RAM ?
> 
> * Writing to RAID1 swap means 2 writes, but they can happen in parallel.
>   I guess (no data on this) that a RAID1 write is not much slower than a plain write.
> * The time spent in RAID1 & LVM code in the kernel is dwarved by the time getting the disk to do something.
> 
> * Reading from RAID1 - you have 2 disks and so can read at twice the speed.

Hi Alain

Thanks to you, Phil and Bruce for some excellant answers.

I think the increased read speed from RAID1 will be worth the extra
disk space needed and will give it a try soon.


-- 
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|    John Edwards   Email: john at cornerstonelinux.co.uk    |
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