Writing to file delayed with Linux 2.6.10 & NFS

How do you see this ? Does it take 35 seconds to perform the write, or
does it take 35 seconds to see the data arrive on the server ? Are you
verifying the new data on the NFS server or are you observing through
another mounted NFS client on the same export ?



Could it be that your NFS server is exporting in async mode ?

I do tail -f on the log file and see that it takes about 35 seconds to
be written to.  I can see using tcpdump that the data does arrive at
the server immediately.

How do I check if my "NFS server is exporting in async mode?"

Could it be, just
sync

solves the problem ?

rds

$ cat /etc/exports
/bla *(rw,sync,no_root_squash)
/blub *(rw,async)

JB

It's

/tftpboot/fadsroot-prod6 *(rw,no_root_squash,no_all_squash)

I have tried changing this but nothing seems to help.  Since we
started seeing this delay when switching from Linux 2.4 to 2.6, is it
possible that there is something in the kernel configuration that is
causing this?   Here is my current Network File System configuration:

#
# Network File Systems
#
CONFIG_NFS_FS=y
CONFIG_NFS_V3=y
# CONFIG_NFS_V4=y
# CONFIG_NFS_DIRECTIO is not set
# CONFIG_NFSD is not set
CONFIG_ROOT_NFS=y
CONFIG_LOCKD=y
CONFIG_LOCKD_V4=y
# CONFIG_EXPORTFS is not set
CONFIG_SUNRPC=y
# CONFIG_SUNRPC_GSS=y
# CONFIG_RPCSEC_GSS_KRB5=y
# CONFIG_RPCSEC_GSS_SPKM3 is not set
# CONFIG_SMB_FS is not set
# CONFIG_CIFS is not set
# CONFIG_NCP_FS is not set
# CONFIG_CODA_FS is not set
# CONFIG_AFS_FS is not set
CONFIG_FS_MBCACHE=y

Yes, but where (on which machine) are you running the 'tail -f'? On the
file server, or on the client that is writing to the file ?



That's good, but the server can choose not to write the changes to disk
right away for performance purposes, i.e. running in asynchrone mode.



Check the /etc/exports file and the 'nfs' man page on your machine.