newfs options for .75TB RAID 5 unit

Matt Virus mattvirus at
Wed Oct 19 08:54:43 PDT 2005

darren david wrote:
> hey all-
> in the somewhat pending case that i may not be able to retrieve my data 
> from RAID 5 unit, I'm wondering what my best option is for blocksize on 
> a .75TB RAID 5 volume. does the 64k RAID stripe size have any impact on 
> these figures? It was previously set to the default( 16384 blocksize, 
> 2048 fragment ) without any noticeable perf issues, but i'm just 
> wondering if, well, size matters? ;)
> thanks,
> darren david
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You shouldn't have any problems.  Read about tunefs if you wish, it may 
help you.

I have a 6x250gb array (1.25tb RAID5).  FBSD 5.2.1 refused to support a 
filesystem larger than 1.0tb, so i chunked it into 2 partitions to get 
around that problem and then I mounted them back using mount_nullfs so 
it appears as though all dirs are on the same partition in a single 
directory.  Not sure if the 1TB filesystem limit problem is unique to me 
or not, but you will be fine with your .75tb no question.

Matt Virus ("veer-iss")

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