[Samba] Possible Issue with Samba Blocking I/O and CPU
andyliebman at aol.com
Thu Jun 10 10:40:22 MDT 2010
> With this setting of write cache, if the apps have a good locality
> of data reference you'll almost never hit the disk, as everything
> will be served out of that memory cache.
> Sorry I can't be too helpful here, but this really doesn't look like
> a Samba problem.
It's not really possible that I could "almost never hit the disk". I am
writing 80 MB/sec of new data to the storage, and I'm reading 220 MB/sec
of data from the storage. Doing this hours on end without any repeated
data. The size of this Samba cache is very small compared to all of
Since sending my first email, I have another 2 hours of flawless
performance. This contrasts with days on end of these "periodic
dropouts" before we set the "write cache" line.
I realize there might be a kernel issue. But I want to understand why
setting "write cache" might mitigate it, and where there is any serious
downside to specifying a write cache?
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