3.6.1 HP PolyServe Matrix Server Administration Guide (T5392-96018, August 2008)

Chapter 9: Configure PSFS Filesystems 98
Disk Quotas
Disk quotas are enabled or disabled at the filesystem level. When quotas
are enabled, the filesystem performs quota accounting to track the disk
use of each user having an assigned disk quota.
When you create a filesystem and enable quotas, you can also set options
including the default hard and soft limits for users on the filesystem. A
hard limit specifies the maximum amount of disk space in the filesystem
that can be used by files owned by the user. A soft limit is typically set
below the hard limit and triggers a warning when it is reached.
If you choose to enforce hard limits, when a file owner reaches the hard
limit, the filesystem will not allow the owner to create files or increase the
size of an existing file; any attempts to allocate more space will fail. The
file owner will need to remove files or reduce their size until the disk
usage falls below the hard limit.
Crash Recovery
When a server using a PSFS filesystem either crashes or stops
communicating with the matrix, another server in the matrix will replay
the filesystem journal to complete any transactions that were in progress
at the time of the crash. Users on the remaining servers will notice a slight
delay while the journal is replayed. Typically the recovery procedure
takes only a few seconds. The recovery process restores only the
structural metadata information. Any regular file data in the blocks that
were in use when the crash occurred may be corrupted or lost.
The server that crashed or lost communication with the matrix will not be
able to access the filesystem until it is rebooted.
Differences Between Matrix Server and Microsoft
Utilities for Volumes and Filesystems
The PolyServe Management Console or Matrix Server commands (for
example, the mx commands) should be used to create dynamic volumes
and PSFS filesystems, to assign (or remove) drive letters or mount points
for a filesystem, and to view properties and status.