[OpenAFS] Removing a backup volume

Steve Simmons scs@umich.edu
Fri, 20 Jul 2007 15:30:31 -0400

On Jul 20, 2007, at 2:18 PM, Michael C Garrison wrote:

> On Fri, 20 Jul 2007, Frank Burkhardt wrote:
>> Sorry. It's 1.4.4 - I just updated the page.
> Cool. I imagine your XFS performance would improve greatly with the  
> no fsync patch that's been discussed on here.
>>> And a few comments on reiser. If you ever need to do a fsck on it  
>>> (which we have in our IMAP
>>> environment) the time it takes is really-really-really long for  
>>> large partitions (7+ days). We've
>>> since moved away from reiser due to stability issues and back to  
>>> ext3.
>> I tested fsck time, too. Have a look at the table - it was ~4,5x  
>> faster than ext3.
> Yeah, but I'd suggest you test reiserfsck with the --rebuild-tree  
> option and see how long it takes then. We ran into corruption that  
> would require rebuilding the B-trees and this is what takes a very  
> long time.

Correct. When the chart says 'fsck', it's not doing an apples and  
apples comparison. Your manager might not be happy when that 177  
second fsck becomes 600,000 seconds.

There have been a number of fruitless discussions of how well a truly  
damaged Reiser fs can actually be recovered on various other mailing  
list. I have no idea which party to the discussion is correct, but  
until there is better data I don't see enough win in Reiser to be  
worth the small-but-undetermined possibility of a long outage.