User Tools

Site Tools


May 2014


Setting the spool directory of the appropriate size and characteristics is crucial for good performance. For guidance regarding the size see Setting the spooldb_slots parameter. Here we give some hints for creating a high performance spool.


Use a zfs partition mounted on /var/noaaport/nbsp/spool. The requirements are

  • 64 bit machine
  • 8 GB or more of Ram

The relevant commands are then

  # zpool create zpool0 da1 da2 da3
  # zfs create -o mountpoint=/var/noaaport/data -o atime=off \
  # zfs create -o mountpoint=/var/noaaport/nbsp/spool -o atime=off \

There is no limitation on the size of the spool with this setup (except of course the total disk space).


Use a tmpfs of the appropriate size mounted on /var/noaaport/nbsp/spool. The size depends on the available Ram. As an example, we will set a 2 GB tmpfs spool.

Following the recommendation in Setting the spooldb_slots parameter, set in nbspd.conf

set spooldb_slots 32768

This would limit the spool average retention time to about 13 minutes (assuming 2500 files/minute) and a size of about 1 GB (assuming 60 MB/min rate), which fit safely in 2 GB.

Then the following command creates the 2 GB tmpfs spool,

mount -t tmpfs -o size=2g tmpfs /var/noaaport/nbsp/spool

or alternatively in /etc/fstab

tmpfs /var/noaaport/nbsp/spool tmpfs  size=2G   0     0

After creating any of these file systems, the permissions/ownsership must be set such that the nbsp user noaaport:noaaport can write to them e.g.,

cd /var/noaaport/nbsp
chown noaaport:noaaport spool

See also Disk setup.

projects/nbsp/articles/spool-finetuning.readme.txt · Last modified: 2014/05/18 14:22 (external edit)