Hi,
Under high load (100 mount/sec) automount will fail with either of these
error messages from mount.
mount: filer3:/vol/vol2/v2q017: can't read superblock
mount: RPC: Authentication error; why = Client credential too weak
I find these error messages suspicious, and do not believe either of
them represent the true problem. I have appended the debug output in
case that is useful. I notice that it seems to try the mount seven
times each, before giving up with one of the above errors (usually
it is the superblock error).
I have also noticed corruption of /etc/mtab. Sometimes static mounts
just disappear from it during busy times. I assume this is some type
of race condition where file locking fails. I do not know if this is
the same problem or a different problem, but I thought I would mention it.
I do not know what causes such a high load of mount requests. But I see
them in the accounting files. Nothing obvious is going on when the errors
occur. They happen for several seconds at a time, 6-8 times per day.
The NFS client is ubuntu 6.06 (dapper), kernel 2.6.17.4, automount 4.1.4.
The NFS server is a Network Appliances filer.
Thanks,
Fletcher
Nov 2 08:41:09 smtp automount[3862]: handle_child: got pid 15301, sig 0 (0),
stat 0
Nov 2 08:41:09 smtp automount[3862]: sig_child: found pending iop pid 15301:
signalled 0 (sig 0), exit status 0
Nov 2 08:41:09 smtp automount[3862]: send_ready: token=4324
Nov 2 08:41:11 smtp automount[3862]: handle_packet: type = 0
Nov 2 08:41:11 smtp automount[3862]: handle_packet_missing: token 4325, name
v2q007
Nov 2 08:41:11 smtp automount[3862]: attempting to mount entry /v/filer3/v2q007
Nov 2 08:41:11 smtp automount[15326]: lookup(yp): looking up v2q007
Nov 2 08:41:11 smtp automount[15326]: ret = 1
Nov 2 08:41:11 smtp automount[15326]: lookup(yp): v2q007 ->
-intr,grpid,quota,retry=2^Ifiler3:/vol/vol2/v2q007
Nov 2 08:41:11 smtp automount[15326]: parse(sun): expanded entry:
-intr,grpid,quota,retry=2^Ifiler3:/vol/vol2/v2q007
Nov 2 08:41:11 smtp automount[15326]: parse(sun):
dequote("intr,grpid,quota,retry=2") -> intr,grpid,quota,retry=2
Nov 2 08:41:11 smtp automount[15326]: parse(sun): gathered options:
tcp,rsize=8192,wsize=8192,intr,grpid,quota,retry=2
Nov 2 08:41:11 smtp automount[15326]: parse(sun):
dequote("filer3:/vol/vol2/v2q007") -> filer3:/vol/vol2/v2q007
Nov 2 08:41:11 smtp automount[15326]: parse(sun): core of entry:
options=tcp,rsize=8192,wsize=8192,intr,grpid,quota,retry=2,
loc=filer3:/vol/vol2/v2q007
Nov 2 08:41:11 smtp automount[15326]: parse(sun): mounting root /v/filer3,
mountpoint v2q007, what filer3:/vol/vol2/v2q007, fstype nfs, options
tcp,rsize=8192,wsize=8192,intr,grpid,quota,retry=2
Nov 2 08:41:11 smtp automount[15326]: mount(nfs): root=/v/filer3 name=v2q007
what=filer3:/vol/vol2/v2q007, fstype=nfs,
options=tcp,rsize=8192,wsize=8192,intr,grpid,quota,retry=2
Nov 2 08:41:11 smtp automount[15326]: mount(nfs): nfs
options="tcp,rsize=8192,wsize=8192,intr,grpid,quota,retry=2", nosymlink=0,
symlink=0, ro=0
Nov 2 08:41:11 smtp automount[15326]: mount(nfs): is_local_mount:
filer3:/vol/vol2/v2q007
Nov 2 08:41:11 smtp automount[15326]: mount(nfs): from filer3:/vol/vol2/v2q007
elected filer3:/vol/vol2/v2q007
Nov 2 08:41:11 smtp automount[15326]: mount(nfs): calling mkdir_path
/v/filer3/v2q007
Nov 2 08:41:11 smtp automount[15326]: mount(nfs): calling mount -t nfs -s -o
tcp,rsize=8192,wsize=8192,intr,grpid,quota,retry=2 filer3:/vol/vol2/v2q007
/v/filer3/v2q007
Nov 2 08:41:11 smtp automount[15326]: >> mount: filer3:/vol/vol2/v2q007: can't
read superblock
Nov 2 08:41:11 smtp automount[15326]: mount(nfs): nfs: mount failure
filer3:/vol/vol2/v2q007 on /v/filer3/v2q007
Nov 2 08:41:11 smtp automount[15326]: failed to mount /v/filer3/v2q007
Nov 2 08:41:11 smtp automount[15326]: umount_multi: path=/v/filer3/v2q007
incl=1
Nov 2 08:41:11 smtp automount[15326]: umount_multi: no mounts found under
/v/filer3/v2q007
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