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HP A5856A RAID 4Si PCI 4-Channel Ultra2 SCSI Controller: Installation and Administration Guide > Chapter 2 Installing the HP RAID
4Si Product
Installing the HP RAID 4Si Controller |
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This section contains information about installing the HP RAID 4Si controller. Note that some of the information differs depending on whether your HP-UX system is running HP-UX 11.0 or 11i.
Before beginning installation, and without removing the controller from its antistatic bag, inspect the controller for any signs of obvious damage, such as chipped or loose components. Contact Hewlett-Packard if the controller is damaged. To install the HP RAID 4Si in your HP-UX system running HP-UX 11.0, follow these steps:
Beginning with version B.11.11.01 of the HP RAID 4Si software, Online Addition and Replacement (OLAR) is supported for the HP RAID 4Si controller. Note that version B.11.11.01 of the software is available on only the HP-UX 11i AP0301 and later Application CD-ROM Media; it is not available in the initial versions of the OEs. The HP RAID 4Si Release Note contains information about which HP-UX systems OLAR of the HP RAID 4Si controller is supported on. Online Addition and Replacement (OLAR) is the ability of a PCI controller to be replaced in or added to an HP-UX system designed to support this feature, without the need for completely shutting down and then rebooting the system or adversely affecting other system components. The system hardware uses the per-slot power control combined with OS support to enable this feature.
You can add or replace an OLAR-compatible controller in either of these ways:
We recommend that you use SAM instead of the rad command to do OLAR procedures. This is because for the most part, SAM prevents you from performing OLAR procedures that would adversely affect other areas of the system. This is not true when you use rad. For detailed information about using either of these two procedures, see Configuring HP-UX For Peripherals. You can order that document from Hewlett-Packard, or you can view, download, and print it from this URL: http://www.docs.hp.com. Table 2-2 “Important OLAR Terms” below explains some important OLAR-related terms. Table 2-2 Important OLAR Terms
During a controller replacement operation, SAM performs a Critical Resource Analysis (CRA), which checks all channels on the target controller for critical resources that would be temporarily unavailable while the controller is shut down. As mentioned earlier, for the most part, SAM prevents you from doing OLAR procedures that would adversly affect other areas of the HP-UX system. See Configuring HP-UX For Peripherals for detailed information. Replacing a controller that is still operating can have extensive consequences. Because power to the slot must be off when the old controller is removed and the new controller is inserted, you must consider the effects of shutting down the controller's functions. This is particularly important if no online failover or backup controller to pick up those functions is installed. For example:
A critical resource is one that would cause a system crash or prevent the operation from successfully completing if the resource were temporarily suspended or disconnected. For example, if the RAID controller to be replaced connects to the unmirrored root disk or swap space, the system will crash when the controller is shut down. During an OLAR procedure, it is essential to check the targeted controller for critical resources, as well as the effects of existing disk mirrors and other situations where a controller's functions can be taken over by another controller that will not be affected. Fortunately, as mentioned earlier, SAM performs a thorough CRA automatically, and presents options to you based on its findings. If you determine that critical resources will be affected by the procedure, you could replace the controller when the system is offline. Or if you must take action immediately, you can use rad to try an online addition of a backup controller and deletion of the target controller. This section explains controller compatibility considerations for doing OLA and OLR. You can add multiple controllers at the same time. When online adding a controller, the first issue you must resolve is whether the new controller is compatible with the system. Each OLAR-capable PCI slot provides a set amount of power. The replacement controller cannot require more power than is available. The controller must also operate at the slot's bus frequency. A PCI controller must run at any frequency lower than its maximum capability, but a controller that could operate at only 33 MHz would not work on a bus running at 66 MHz. (The HP RAID 4Si controller operates at 33MHz.) rad provides information about the bus frequency and power available at a slot, as well as other slot-related data. If your system has one or more slots that support OLAR—and you want to use OLA to install the RAID 4Si controller in one of those slots—install the controller in your HP-UX system according to the procedure described in the "Managing PCI Cards with OLAR" chapter of the Configuring HP-UX Peripherals manual. After you add a new HP RAID 4Si controller, SAM tries to locate the RAID 4Si driver. (Remember that OLAR is supported beginning with version B.11.11.01 of the driver, which is available on the AP0301 and later Application CD-ROM media [it is not the version that is automatically installed with the OEs].) If SAM cannot locate the driver, you cannot use the new controller until you install the driver (remember that driver installation requires a system reboot). If SAM locates the driver, SAM then determines whether the new controller is functional. If it is not functional, SAM displays an error message. When online replacing an interface controller, the replacement controller must be identical to the controller being replaced, or at least be able to operate using the same driver as the replaced controller. This is referred to as like-for-like replacement and should be adhered to, because using a similar but not identical controller can cause unpredictable results. For example, a newer version of the target controller that is identical to the older controller in terms of hardware might contain an updated firmware version that could potentially conflict with the current driver. When the replacement controller is added to the system, the appropriate driver for that controller must be configured in the kernel before beginning the replacement operation. SAM ensures the correct driver is present. (In most cases, the replacement controller will be the same type as a controller already in the system, and this requirement will be automatically met.) Keep the following things in mind:
If you have any question about the driver's presence, or if you are not certain that the replacement controller is identical to the existing controller, you can use ioscan together with rad to investigate. Note that SAM does not allow the HP RAID 4Si controller to be suspended in either of these situations:
After you online replace a RAID 4Si controller, SAM checks the replacement controller to make sure it is permitted, according to the like-for-like rules. If the conltroller is permitted, SAM automatically activates it. If it is not permitted, SAM displays an error message. If your HP-UX system does not support OLAR, or it does support it but you do not want to use OLA to install the HP RAID 4Si controller, follow the steps for an HP-UX 11.0 system, described in “HP-UX 11.0”. If your system has one or more slots that support OLAR—and you want to use OLA to install the controller in one of those slots—follow these steps:
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