Enabling or Disabling Fast-Write for One Disk Drive
This option lets you enable or disable the fast-write function for one disk drive.
1. For fast-path access to the Change/Show Characteristics of an SSALogical Disk
menu:
a. Type smitty chgssardsk and press Enter.
b. From the menu displayed, select the logical disk that you want to change.
Otherwise:
a. Select Change/Show Characteristics of an SSA Logical Disk from the SSA
Logical Disks menu.
b. From the menu displayed, select the logical disk that you want to change.
Alist of options for the logical disk drives is displayed:
Change/Show Characteristics of an SSA Logical Disk
Type or select values in entry fields.
Press Enter AFTER making all desired changes.
[MORE...6] [Entry Fields]
Location Label [ ]
Parent ssar
Size in Megabytes 4512
adapter_a ssa0
adapter_b ssa1
primary_adapter adapter_a +
Connection address 0004AC506C3600E
Physical volume IDENTIFIER 00406fdac2fb8203000000>
ASSIGN physical volume identifier no +
RESERVE disk on open yes +
Queue depth [5] +
Maximum Coalesce [0x20000] +
Enable Fast-Write yes +
Bypass Cache In 1 Way Fast-Write Network no +
[BOTTOM]
F1=Help F2=Refresh F3=Cancel F4=List
F5=Reset F6=Command F7=Edit F8=Image
F9=Shell F10=Exit Enter=Do
2. If you want to enable the fast-write function for a particular disk drive, set the
Enable Fast Write option to yes for that disk drive.
If you want to disable the fast-write function for a particular disk drive, set the
Enable Fast Write option to no for that disk drive.
Notes:
a. If you are running a two-way fast-write operation, and you enable or disable the
fast-write function, the hdisk on the second using system becomes unavailable.
From the second using system, delete that hdisk, and reconfigure as follows:
1) Type: rmdev -l hdiskname -d
2) Run cfgmgr to reconfigure the new hdisk.
b. Youcan disable the fast-write function from this menu only if no data for your
selected device is present in the fast-write cache. If data for your selected
214 User’s Guide and Maintenance Information
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