HP Hitachi Dynamic Link Manager Software - Manual (Page 485)

B. Glossary
461
• Target ID (hexadecimal number)
• Host LU number (hexadecimal number)
A path name is used to identify a path.
(See also: host LU number)
persistent reservation
Similar to reservations, persistent reservations enable a server to declare that it has
exclusive rights to use an LU, and prevents other servers from accessing that LU. Note,
however, that while reservations allows a server to have exclusive use of only one path
to the LU, persistent reservations allow a server to have exclusive rights to use multiple
paths.
If persistent reservations are used in HDLM, a host can have exclusive use of multiple
paths to an LU, so that load balancing among these paths is possible.
(See also: reservation)
R
Remove LU
A function that allows the user to delete LUs from an HDLM target host. This function
is performed when an LU is deleted, or when all the paths connecting the LU to the
host are placed in the
Offline(E)
status.
reservation
The reservation function enables a host to declare that it has exclusive rights to use a
particular LU, and prevents other hosts from accessing that LU. Access permission for
an LU that has been reserved is given only to the host that issued the reservation, so
the LU cannot be accessed from multiple paths (coming from multiple hosts)
simultaneously. However, because of this, load balancing is not possible.
(See also: persistent reservation)
S
SAN (Storage Area Network)
A high-speed network connecting hosts to storage systems. This network is
independent of a LAN and is dedicated to data transfers. A SAN provides faster access
to storage systems, and prevents the transfer of high-volumes of data from
deteriorating LAN performance.
SCSI device
A SCSI disk device