login
Header Space

 
 

Re: HAMMER filesystem update - design document

Score:
Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
To: <kernel@...>
Date: Wednesday, October 10, 2007 - 7:45 pm

Matthew Dillon wrote:

This is the functional equivalent of a RAID1, and that is all HAMMER 
provides; the point of RAIDZ (and RAID3,4,5,6,etc) is that you don't 
need 2n bytes worth of disk for n bytes worth of usable storage, yet 
keeping some level of resilience. There is something to be said for this 
kind of scheme, namely not wasting as much disk space, but in the case 
of RAID1,0,10,01, moving that to a different layer (e.g. Vinum) is good 
enough.

In a clustering environment, it's not likely that you'll want anything 
other than full replication, but at least on single-node storage 
systems, using storage more efficiently has its uses; even though it 
means longer recovery times.

Cheers,
-- 
         Thomas E. Spanjaard
         tgen@netphreax.net
Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:
Re: HAMMER filesystem update - design document, Matthew Dillon, (Wed Oct 10, 6:38 pm)
Re: HAMMER filesystem update - design document, Thomas E. Spanjaard, (Wed Oct 10, 7:45 pm)
speck-geostationary