IBM 86626RY Hardware Maintenance Manual - Page 84
Using custom configuration, automatic use in the event of a drive failure.
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the basic input/output system (BIOS) during startup will be the startup (boot) drive. If you have two or more arrays, each array can be one logical drive, or you can divide each array into multiple logical drives, as long as the total number of logical drives for all of the arrays does not exceed eight. Note Independent of the RAID logical drives, most operating systems allow you to partition the logical drives further. The optimal way to create arrays is to use hard disk drives that have the same capacity. Hard disk drive capacities influence the way you create arrays. Drives in an array can be of different capacities (1 GB1, or 2 GB, for example), but RAID controllers treat them as if they all have the capacity of the smallest disk drive. For example, if you group three 1 GB drives and one 2 GB drive into an array, the total capacity of the array is 1 GB times 4, or 4 GB, not the 5 GB physically available. Similarly, if you group three 2 GB drives and one 1 GB drive into an array, the total capacity of that array is 4 GB, not the 7 GB physically available. A hot-spare drive is a disk drive that is defined for automatic use in the event of a drive failure. The hot-spare drive must be of equal or greater capacity than the drive that it is intended to replace. If a physical drive fails and it is part of a RAID level-1 or RAID level-5 logical drive, the ServeRAID controller automatically starts to rebuild the data on the hot-spare drive. You can include a maximum of 16 physical drives in an array when the stripe-unit size is set to 8 KB (the default setting) or 16 KB, and you can include a maximum of 8 physical drives in an array when the stripe-unit size is set to 32 KB or 64 KB. (See "Interleave depth and stripe-unit size" on page 67 and page 90 for more information.) Using custom configuration: To use the Custom Configuration path: 1. Select the ServeRAID controller that you want to configure in the Main Tree. 1 When referring to hard-disk-drive capacity, GB means approximately 1 000 000 000 bytes; total user-accessible capacity may vary depending on operating environment. 76 Netfinity Server HMM