3.5.1 Matrix Server Release Notes

PolyServe Release Notes 22

10646 Invalid link count can be returned to NFS clients

Linux NFS clients running with Linux 2.4.x kernels will return

an invalid link count via the stat() system call interface if a file

with multiple hard links is unlinked by one coincident with a

failover of a Virtual NFS Service. The unlink succeeds correctly

in the server and the correct link count is returned to the client,

but the stat() system call on the NFS client will continue to

return the old link count. This situation may cause problems

with programs that unlink files with multiple hard-links and

then use the stat() system call interface to verify that the link

count is what is expected.

This problem has not been observed on Linux NFS clients with

2.6.x kernels.

10742 Unmounting exported filesystem requires extra step

Before a PSFS filesystem can be unmounted, all processes must

release their references on the filesystem. The NFS server

process retains these references on exported filesystems, and

prevents the filesystem from being unmounted.

To work around this problem, you will need to take the

following steps to unmount a PSFS filesystem that is being

exported from an Export Group. (This procedure does not

impact other Export Groups exporting different filesystems via

the same server.)

1. Disable the Export Groups that are exporting the filesystem

to be unmounted. You will need to disable the Export Groups

on each server from which the filesystem is to be unmounted.

2. Run the command exportfs -ua on each server where the

filesystem will be unmounted.

3. Unmount the filesystem from the servers. If you see a “device

busy” message, run the exportsfs -ua command again and

then repeat the unmount operation.

Defect Description