Re: [squid-users] what should squid -z do

Hi all,
It will be very useful to disable memory mode only.
For my infrastructure i could remove mfs ramdisk for squid disk cache
(and some OpenBSD ffs1 high IOPS rate problems) to use it as memory only
mode and then cache 12Go instead of 6.
You're welcome if you put this option under 3.2.8 :)

-- 
Best regards,
Loïc BLOT, UNIX systems, security and network expert
http://www.unix-experience.fr
Le lundi 04 février 2013 à 16:43 +1300, Amos Jeffries a écrit :
> On 4/02/2013 7:54 a.m., Eliezer Croitoru wrote:
> > <snip>
> > Why squid should not create a cache_dir if one dosn't exits at startup?
> > What side effects can come from that?
> 
> 
> We have the occasional problem with network shares or broken HDD, that 
> the cache disk is not available at startup time. Squid normal startup is 
> required to abort or run in memory-only mode if this happens. 
> Initializing a cache_dir unconditionally can lead to some bad problems, 
> so we make it a manual step.
> 
>    NP: as mentioned earlier, we are missing a command-line or squid.conf 
> option to indicate that memory-only mode is allowed.
> 
> The side effects are initializing sub-directories inside a HDD mount 
> point before it mounts, preventing the mount from working. Possibly 
> over-flowing a small local HDD with cache files which were expected to 
> be stored on a much larger background SAN system. That takes out the 
> whole server Squid is running on.
> 
> 
> >
> > It can more complex but a "check", "reset", "build" flags can be added 
> > to the -z like in -k parse|...|..| while having a default to "build" 
> > which is what it does's now.
> >
> > The "build" will be the default and compatible with the current -z 
> > flag works.
> 
> Nice idea.
> 
> However, these operations are only needed occasionally and I am hopng to 
> build that functionality into a tool outside of the main proxy binary. 
> We have a set of *dump tools and the squidpurge tool, an the -z 
> functionality which need to be cleaned up and can be aggregated in a 
> separate binary. If we do it right that tool can be used safely at any 
> time, whether or not Squid is running, and can utilize the UDS sockets 
> to update the workers memory indexes as well.
> 
> 
> Amos