Method used to change concurrent disks in the AIX operating system

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To change concurrent disks, you need to stop service operations and perform the following steps:
1. Run lspv to check the volume group and disk status.
2. After services are stopped, run varyoffvg [vg_name] to activate specified volume groups.
3. Run lsattr -El updiskX | grep queue_depth to check the queue depth of specified disks.
4. Run chdev -a queue_depth=32 -l updiskX to change the queue depth of specified disks.

Other related questions:
Method used to change the number of concurrent disks in Solaris 10
1. Modify the configuration file. Run vi to open the /etc/system file and modify or add the parameter of concurrent disks. In this example, change the number of concurrent disks to 5, save the setting, and exit. set sd:sd_max_throttle =5 set ssd:ssd_max_throttle =5 2. Run reboot to restart the host to make the configuration take effect.

Method used to change the number of concurrent disks on VMware ESX
Method used to change the number of concurrent disks on VMware ESX 4.0: 1. Log in to the server by using the VMware vSphere Client. 2. Select the server to be configured and choose Configuration > Advanced Configuration to open the Advanced Configuration page. 3. On the Advanced Configuration page, change the number of concurrent disks. Specifically, on the Advanced Configuration page, select Disk on the navigation bar on the left, select Disk.SchedNumReqOutstanding on the left, and specify the desired value in the box. Click OK to exit.

Method used to modify the number of concurrent disks by using Fibre Channel HBA in Linux
You can perform the following operations to modify the number of concurrent disks by using Fibre Channel HBA in Linux: The procedures are as follows (QLogic HBA is used as an example): 1. Query whether the host is installed with Fibre Channel HBA and query the HBA manufacturer. Run the lspci |grep "Fibre Channel" command to query HBA information. 2. Modify the configuration file. Run vi to open the /etc/modprobe.conf file and modify or add the parameter of concurrent HBA. Note: Modify the /etc/modprobe.conf.local file in SUSE and do not modify the /etc/modprobe.conf file. 3. Run the multipathing command upUpdate. If the actual operating system and hardware are different, the information to be displayed may also be different. 4. Run the reboot command to restart the host. 5. Run the lsscsi -l command to check whether the parameter of concurrent HBA takes effect.

Using a one-click operating system installation disk as a standard installation disk
The following uses the IBM one-click operating system installation disk as an example to describe how to use a one-click operating system installation disk as a standard installation disk. The procedure is as follows: Ensure that the RAID configuration is complete. Insert the SUSE Linux 11 SP1 one-click installation CD-ROM and restart the server. Wait about 5 minutes. The system restarts, and the SUSE Linux Enterprise Server window is displayed. Use the arrow keys to select the installation mode (install linux for 7 hard disks for example). Press the Backspace key to delete the contents after Boot Options. Press Enter. The subsequent installation procedure is the same as that for installing the operating system using a standard operating system installation disk.

Method used to restart the SUSE Linux operating system
Restarting the operating system interrupts services. Therefore, exercise caution when performing this operation. To restart the operating system, run the following command: shutdown -r -t time now When you restart the operating system, the remote login user exits. The restart takes 3 to 5 minutes.

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