4.0.0 HP Polyserve Matrix Server Administration Guide (T5392-96052, March 2010)

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.
The Windows operating system and Windows Disk Management utilities are not
fully aware of PSFS filesystems or Matrix Server dynamic volumes. Although these
Microsoft utilities can be useful for troubleshooting issues, they cannot display status
from the perspective of a Matrix Server volume or filesystem.
Dynamic volumes
Dynamic volumes created with the Matrix Server Volume Manager are not the same
as Microsoft dynamic volumes. Matrix Server cannot use Microsoft dynamic volumes,
and vice versa. (Although it is possible to format a Matrix Server dynamic volume
with FAT or NTFS, it is not recommended because FAT and NTFS are not cluster
filesystems; data corruption will result if more than one server at a time has local
access to the same FAT or NTFS filesystem, a problem that the PSFS filesystem was
specifically designed to solve).
The PolyServe Management Console includes a Volume Properties window (select
Storage > Dynamic Volume > Volume Properties) that displays status information for
Configure PSFS filesystems104