[CentOS] Re: A question about RAID and partitions

Tue May 22 23:24:22 UTC 2007
William Warren <hescominsoon at emmanuelcomputerconsulting.com>

not actually.  There's overhead with doing that.  plus WHEN there's a 
disk failure your raid0 is toast and your raid 1 is degraded.  Why not 
jsut run 4 disks since they are so cheap nowadays and not have to deal 
witht he complications?

Miguel Medalha wrote:
>> If you only have 2 drives there's not much you can do to avoid 
>> concurrent access.  The killer is head seek time - if you have your 
>> only 2 drives tied together in any kind of raid and the head needs to 
>> be in 2 places at once it doesn't matter much how you laid out the 
>> partitions. Reads can be sort-of independent on raid1 but writes make 
>> both seek to the same place.
>>
> That's not what I was referring to. I meant, for example, that if you 
> have on the same disks a RAID-0 containing data that is very frequently 
> used and a RAID-1 containing data that is rarelly accessed, then you 
> still beneffit from the qualities of both  RAID types despite them being 
> on the same physical disks.
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