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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 SSA Logical 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.
A list 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. You can 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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