[CentOS] Re: Anaconda doesn't support raid10

Ruslan Sivak rsivak at istandfor.com
Fri May 11 22:15:25 UTC 2007


John R Pierce wrote:
>
>> Well the reason not to put /boot on the same spindles as md1 has 
>> already been mentioned a few times.  Basically flexibility.
>> What do you mean LVM doesn't really do striping?  What does globbing 
>> mean?  Does it mean there is no performance difference between 
>> striping LVM and just concatenating 2 raid1's?
>
>
> conventional stripesets tend to use a stripe size around 32k or 128k 
> bytes.   LVM tends to use a fairly large PE size, often 32MB.   LVM 
> -is- striping these PE's, if you told it to do that, but its striping 
> with this very large chunk size, which means far fewer individual disk 
> operation will utilize both logical drives.   If you have lots of 
> concurrent disk accesses, this may not matter.
> _______________________________________________

The PE could be changed to a lower #.  Would this negativelly affect LVM 
somehow?

Russ





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