Sybase DC35823-01-1500-04 User Manual
Page 56

Enabling asynchronous disk I/O
40
Adaptive Server Enterprise
# ls /dev/asyn*
idev/async /dev/asyncdsk
For IBM AIX
Enable asynchronous disk I/O.
This step is mandatory for IBM users.
Enable asynchronous I/O by adjusting the kernel parameters, using the System
Management Interface Tool (SMIT):
1
Enter “smit” at the UNIX prompt.
2
From the Devices menu, select Asynchronous I/O.
3
Select Change/Show Characteristics of Asynchronous I/O.
4
Enter the values from Table 3-2:
Table 3-2: SMIT parameters for asynchronous I/O
If your system uses more than seven disks at the same time for Asynchronous
I/O, increase the MAXIMUM number of servers value by 1 for every active
device.
Note
Setting the minor device number on /dev/async to 4 reduces or eliminates
transient 605 errors in Adaptive Server.
If you are using LVM mirroring, set the minor device number to 0x0.
SMIT parameter
Values for RS/6000 AIX
4.3.3
MINIMUM number of servers
1
MAXIMUM number of servers
10
MAXIMUM number of REQUESTS I/O
4096
Server PRIORITY
39
ASYNC I/O STATE
(to be configured at system restart)
Available