On Tue, 2005-11-22 at 09:39 -0500, Brian Long wrote:
> I have an auto.master deployed to thousands of hosts and it looks like
> this:
>
> /misc /etc/auto.misc --timeout=60
> /auto /etc/auto.indirect rsize=32768,wsize=32768,tcp
> /users auto_home rw,hard,intr,rsize=32768,wsize=32768,tcp
>
> As you can see, /users comes from NIS auto.home map. In our case,
> auto.home contains over 34,000 entries. I've noticed in RHEL 3 U5 and
> beyond (autofs-4.1.3-130), trying to stat (ls) /users/no-such-user takes
> roughly 12-15 seconds. In RHEL 3 U3 (autofs-4.1.3-12), it returns
> immediately. This is a regression in my opinion.
>
> After looking at tcpdump data, it appears automounter is downloading the
> entire auto.home map when it fails to lookup "no-such-user". This
> results in a > 700KB transfer from the NIS server :(
>
> In the older autofs version, it does NOT do this. I have opened a Red
> Hat issue tracker (82760), but in parallel I wanted to ask this list if
> this is known behavior and if there is any way I can disable the
> download of the entire auto.home map using /etc/sysconfig/autofs or
> auto.master options to the automount program.
FYI, in looking at the strace output from the automount process once it
downloads auto.home, it goes through all 34,000+ entries and tries to
rmdir /users/<entry>. This fails 34,000 times. Why the heck would it
behave like this?
/Brian/
--
Brian Long | | |
IT Data Center Systems | .|||. .|||.
Cisco Linux Developer | ..:|||||||:...:|||||||:..
Phone: (919) 392-7363 | C i s c o S y s t e m s
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