We have AFS mounted on our Linux compute cluster and this is screwing up
the disk_free, disk_total and part_max_used metrics in gmond. With afs
mounted, I have the following entry in /proc/mounts:
AFS /afs afs rw 0 0
df also shows this for afs:
AFS 9000000 0 9000000 0% /afs
I am sure these numbers are meaningless for afs but the statfs syscall
in get_fs_usage must be adding this 9GB value to the disk metrics
because our numbers are off by almost exactly that amount. I have
attached a patch which adds afs to the list of remote filesystem types
to skip in addition to nfs, autofs and smbfs.
I said almost above, because even with my patch, gmond's value is a lot
closer to what I add up with df, but still a little bit off and I am not
sure why. I noticed that the device_space function skips filesystems
that it has seen before, but it seems to go by the device name, not the
mount point. On my desktop (RedHat 2.4.18-24.7.x kernel), I seem to
have the root filesystem listed twice with different device names:
rootfs / rootfs rw 0 0
/dev/root / ext3 rw 0 0
Is this being counted twice?
~Jason
PS. Should devices with name equal to none also be skipped, like the
Linux kernel's shared memory fs? From /proc/mounts I have:
none /dev/shm tmpfs rw 0 0
And this filesystem does report some space that might be getting added
up with all the rest:
none 256816 0 256816 0% /dev/shm
--
/------------------------------------------------------------------\
| Jason A. Smith Email: [EMAIL PROTECTED] |
| Atlas Computing Facility, Bldg. 510M Phone: (631)344-4226 |
| Brookhaven National Lab, P.O. Box 5000 Fax: (631)344-7616 |
| Upton, NY 11973-5000 |
\------------------------------------------------------------------/
diff -uNr ganglia-monitor-core-2.5.2-dist/gmond/machines/linux.c ganglia-monitor-core-2.5.2/gmond/machines/linux.c
--- ganglia-monitor-core-2.5.2-dist/gmond/machines/linux.c Tue Jan 7 12:05:38 2003
+++ ganglia-monitor-core-2.5.2/gmond/machines/linux.c Mon Mar 3 16:41:49 2003
@@ -919,7 +919,8 @@
or if (it is of type smbfs and its Fs_name starts with `//'). */
return ((strchr(device,':') != 0)
|| (!strcmp(type, "smbfs") && device[0]=='/' && device[1]=='/')
- || (!strcmp(type, "autofs")));
+ || (!strcmp(type, "autofs"))
+ || (!strcmp(type, "afs")));
}
/* --------------------------------------------------------------------------- */
