Hello all,
I've been trying to perform a stack trace on the automount process using "strace -p `pidof automount`". However, when strace attaches to this PID nothing happens. Not even when a mount is accessed. Is there a better way to get a stackdump of the automount process? Thanks, --- James T. Richardson, Jr. [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> eXcellence in IS Solutions, Inc. 713-862-9200 x226 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of James Richardson Sent: Tuesday, November 27, 2007 10:11 AM To: [email protected] Subject: [autofs] Slow mounts when using large round robin sets All, I have stumbled upon an interesting situation when using AutoFS to mount nfs shares where the the NFS server is served from a large (over 20) round robin set. For example, I use NIS to distribute my auto.home NIS map. Each of my users has their home directory located on a central NFS server with multiple network interfaces (about 50). Those 50 IP's are in a DNS round robin set. When using autofs to mount one of their home directories dynamically it can take anywhere from one to 7-8 seconds (usually about 2 seconds). When the DNS RR set is scaled down to only have 15-20 entries the mounting time is around half of one second - (.5 seconds). Mounting directly using the mount command is the fastest and always mounts in under .5 seconds. There are no errors in the syslog (messages or daemon.log). I'm using kernel 2.6.21 and autofs 5.0.1`-9 (and have tested this with 5.0.2-1). One interesting side note, I did some packet captures with the larger DNS RR set, and found that for a single autofs mount, there could be anywhere from 3,000-5,000 DNS queries for the NFS server. I'm puzzled as to why this is happening or how to further troubleshoot the issue. Thanks, --- James T. Richardson, Jr. [EMAIL PROTECTED] eXcellence in IS Solutions, Inc. 713-862-9200 x226 NOTICE: This message may contain privileged or otherwise confidential information. If you are not the intended recipient, please immediately advise the sender by reply email and delete the message and any attachments without using, copying or disclosing the contents. NOTICE: This message may contain privileged or otherwise confidential information. If you are not the intended recipient, please immediately advise the sender by reply email and delete the message and any attachments without using, copying or disclosing the contents.
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