Re: high load, no bottleneck

[Brian Buhrow <buhrow%nfbcal.org@localhost>]

        hello.  How do you  move the  wapbl log to a drive other than the one
on which the filesystem that's being logged is runing?  In other words, I
thought the log existed on the same media as the filesystem.  Is that not
the case?
On Sep 17,  8:34pm, Christos Zoulas wrote:
} Subject: Re: high load, no bottleneck
} On Sep 18,  2:22am, manu%netbsd.org@localhost (Emmanuel Dreyfus) wrote:
} -- Subject: Re: high load, no bottleneck
} 
} | > The case to worry about is the scenario where the machine
} | > suddently loses power, the data never makes it to the physical media,
} | > and gets lost from the cache. In this case you might end up with a
} | > filesystem that has inconsistent metadata, so the next reboot might
} | > end up causing a panic when the filesystem is used. The solution there
} | > is to reboot and force an fsck. 
} | 
} | It seems the system would be better without WAPBL enabled in this case.
} | Is there any befenit left?
} 
} On large filesystems with many files fsck can take a really long time after
} a crash. In my personal experience power outages are much less frequent than
} crashes (I crash quite a lot since I always fiddle with things). If you
} don't care about fsck time, you don't need WAPBL. Another easy thing you can
} try is to put the WAPBL log in a flash drive and re-enable the cache flushes.
} 
} christos
>-- End of excerpt from Christos Zoulas