Re: Four Drive RAID-5 on RAIDFrame Considered Harmful...

On Oct 9, 2007, at 6:53 PM, Thor Lancelot Simon wrote:

> On Tue, Oct 09, 2007 at 04:59:58PM -0700, Robert P. Thille wrote:
>>
>> I tracked it down to the problem that 2 and 3 are relatively  
>> prime :-)
>> Given 4 drives in a RAID-5 setup, you get 3 data blocks per raid  
>> stripe,
>> but the filesystem block size Must be a power of 2, so you always  
>> have
>> to write at least one partial stripe.
>
> No.  Examine the "maxcontig" FFS parameter.
>

maxcontig appears to be obsolete.  Looking thru the sources (current  
from a month or so ago), I don't think it's used by the kernel/ 
filesystem, and the options mentioned in postings I found in the  
mailing lists don't seem to exist anymore.

Am I missing something?

Thanks,

Robert


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