ZFS Hangs

Kris Kennaway kris at FreeBSD.org
Sun Nov 4 02:12:59 PST 2007


Peter Schuller wrote:
>> For example, pkg_delete seems to be _extremely_ slow and ^T reports that
>> it is stuck waiting on zfs:(&zio->io_cv) for an unreasonable (IMO) amount
>> of time.
> 
> FWIW, I have seen pkg_install (and possibly other pkg_* tools) being extremely 
> slow seemingly as a result of the active set of files it touches exceededing 
> the amount cached. In particular I had this problem after converting to ZFS, 
> but prior to switching to amd64 and more RAM.
> 
> It would sit and churn on disk I/O forever, entirely seek bound. Tracing the 
> processes showed it traversing the package database over and over (presumably 
> recursively following dependencies or some such). So the same files were 
> touched any number of times. As a result, with too little cached, runtime 
> exploded (it took hours and hours upgrading my desktop using *binary* 
> pre-built packages because the larger packages with a lot of dependencies 
> would take forever to install and delete).

It certainly could be a caching effect but the particular problem you 
were seeing should have been fixed.  Are you still seeing it?

Can the OP report whether e.g. gstat shows disk activity?

Kris


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