Blog O’ Matty

While reading through RFC 1813 (NFSv3 RFC), I came across the following interesting NFS error:

NFS3ERR_JUKEBOX

     The server initiated the request, but was not able to
     complete it in a timely fashion. The client should wait
     and then try the request with a new RPC transaction ID.
     For example, this error should be returned from a server
     that supports hierarchical storage and receives a request
     to process a file that has been migrated. In this case,
     the server should start the immigration process and
     respond to client with this error.

This is nifty, and leads me to wonder if any NFS-based HSM solutions are utilizing this.

While reading through the NFS RFCs this week, I decided to write nfsclientstats.pl to view NFS operations by process:

$ nfsclientstats.pl

process    read write readdir getattr setattr lookup access create remove rename mkdir rmdir
mkdir         0     0       0     380       0    190      0      0      0      0   190     0
mv            0     0       0     189       0   1890   2079      0      0    189     0     0
orca       3328   194       0    5496       6   6882   8246     12      0      0     0     0
rm            0     0     760     950       0   2850   5320      0    190      0     0   190
touch         0     0       0     378     189   1512   1323    189      0      0     0     0

process    read write readdir getattr setattr lookup access create remove rename mkdir rmdir
mkdir         0     0       0     386       0    193      0      0      0      0   193     0
mv            0     0       0     195       0   1950   2145      0      0    195     0     0
orca       3110   169       0    8312      22  10434  12476     44      0      0     0     0
rm            0     0     780     975       0   2925   5460      0    195      0     0   195
touch         0     0       0     388     194   1552   1358    194      0      0     0     0

The script uses the DTrace FBT provider, and produces output that is greater than 80-characters. If you are an 80-column purist, you might want to refrain from downloading the script. ;) Hope folks find this useful!