IBM 86655RY Hardware Maintenance Manual - Page 213

Drive State Standby Hot Spare Meaning A standby hot spare is a hot-spare drive that the ServeRAID controller has spun down. If an online drive becomes defunct and no suitable hot-spare drive is available, a standby hot-spare drive of the appropriate size automatically spins up, and enters the rebuild state. Logical drive state descriptions: The following table provides descriptions of the valid logical drive states. Drive State Blocked Critical Migrating Critical System Critical Migrating Offline Okay System Meaning During a rebuild operation, the ServeRAID controller sets the state of any RAID level-0 logical drives associated with a failed array to the blocked state; then, it reconstructs the data that was stored in RAID level-1, RAID level-1E, RAID level-5 and RAID level-5E logical drives. After the rebuild operation completes, you can unblock the RAID level-0 logical drives, and access them once again. However, the logical drive might contain damaged data. You must either re-create, reinstall, or restore the data from the most recent backup disk or tape to the RAID level-0 logical drive. A logical drive in the critical state that is undergoing a logical drive migration (LDM). The ServeRAID controller uses this reserved state during a logical drive migration (LDM) when the logical drive is in the critical state. A RAID level-1, RAID level-1E, RAID level-5, or RAID level-5E logical drive that contains a defunct physical drive is in the critical state. A critical logical drive is accessible, despite a physical drive failure. Attention: If the state of the logical drive is critical, refer to "Drive replacement (rebuilding a defunct drive)" on page 184. The logical drive is undergoing a logical drive migration; that is, a change in RAID levels, a change in logical drive size, an increase in free space, or a RAID level-5E compression or decompression. The logical drive is offline and not accessible. This state occurs when one of the following is true. • One or more physical drives in a RAID level-0 logical drive are defunct. • Two or more physical drives in a RAID level-1, RAID level-1E, or RAID level-5 logical drive are defunct. • Three or more drives in a RAID level-5E logical drive are defunct. If any of these are true, refer to "Drive replacement (rebuilding a defunct drive)" on page 184. The logical drive is okay. It is in a good, functional state. The ServeRAID controller uses this reserved state during logical drive migration (LDM). Device drivers: The ServeRAID controller requires the installation of device drivers. See the README file on the Device Driver Diskette and Device Drivers for SCO Operating Systems for detailed instructions. If the operating system is installed from the ServerGuide CD, the device drivers are installed automatically. However, if the operating system is installed from another source, the device drivers must be installed. See the README file on the Device Driver diskette for installation instructions. Installing and configuring ServeRAID controllers 203