Re: high load, no bottleneck

[David Brownlee <abs%netbsd.org@localhost>]

http://www.math.uni-bonn.de/people/ef/dotcache/ has a typo in the
first subheading "Dotache" :)

On 24 September 2013 13:38, Edgar Fuß <ef%math.uni-bonn.de@localhost> wrote:
>> We want fsync to do a disk sync, and client are unlikely to be fixable.
> In my case, the culprit was SQLite used by browsers and dropbox.
> As these were not fixable, I ended up writing a system that re-directs these
> SQLite files to local storage 
> (http://www.math.uni-bonn.de/people/ef/dotcache).
>
>> RMW?
> Read-Modify-Write.
> On a RAID 4/5, writing anything that's not an entire stripe needs either to
> read the rest of the stripe (to be able to compute the new parity) before
> writing the modified part and the parity; or it (if you modify less than half
> the stripe) reads both the old data and old parity to compute the new parity.
> You don't have that on RAID 1, of course.