Bypassing the Cache in a One-Way Fast-Write Network
If you are using the two-way fast-write function (that is, two adapters have access to a
fast-write disk drive), you can choose whether you want fast-write operations to
continue if the partner adapter fails or becomes not accessible. By default , fast-write
operations continue.
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 do not want the fast-write function to continue on a particular disk drive if the
partner adapter becomes not accessible, set the Bypass Cache in 1 Way
Fast-Write Network flag to yes for that disk drive. With the flag set to yes, an error
is logged when the cache is bypassed.
If you want the fast-write function to continue on a particular disk drive if the partner
adapter becomes not accessible, set the Bypass Cache in 1 Way Fast-Write
Network flag to no for that disk drive.
Chapter10. Using the Fast-Write Cache Feature 217