Hitachi Dynamic Link Manager Software Users Guide for AIX

In HDLM 6.3 or later, the default reservation policy values for multiple hdisks
can be changed simultaneously by executing the dlmchpdattr utility.
Format
/usr/DynamicLinkManager/bin/dlmchpdattr
{-a Attribute=Value [Attribute=Value ...]
[-u { HTC | XP }] [-A] [-s]
| -o
| -h}
Parameters
-a Attribute=Value
Specifies one or more attribute name and attribute value pairs. If
specifying multiple pairs, separate them by using a space, and enclose
the list of pairs in double quotation marks (").
The following table lists the attribute names and values that can be
specified.
Table 7-3 Attribute names and values that can be specified in
dlmchpdattr
Attribute names that can be
specified in dlmchpdattr
Values that can be specified
reserve_policy
Specifies the reservation policy to be used.
no_reserve: Reservation requests are ignored,
and LUs are not reserved.
PR_exclusive: Uses persistent reservations
(exclusive-host methodology) to reserve disks..
PR_shared: Uses persistent reservations
(shared-host methodology) to reserve disks.
The default is PR_exclusive.
max_transfer
Specifies the maximum size of data that can be
transferred to the disk.
The range of specifiable values conforms to the
applicable PdAt ODM rule for HTC_ODM or
XP_ODM.
queue_depth
Specifies the maximum number of requests that
the queue on the disk can hold.
The range of specifiable values conforms to the
applicable PdAt ODM rule for HTC_ODM or
XP_ODM.
rw_timeout
Specifies the timeout value for a read or write
operation. The range of specifiable values
conforms to the applicable PdAt ODM rule for
HTC_ODM or XP_ODM.
7-14
Utility Reference
Hitachi Dynamic Link Manager (for AIX) User Guide