Lenovo ThinkServer RD240 MegaRAID SAS Software User Guide - Page 44
Global Hot Spare, Dedicated Hot Spare
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If the hot spare is designated as having enclosure affinity, it will attempt to rebuild any failed drives on the backplane that it resides in before rebuilding any other drives on other backplanes. Note: If a rebuild to a hot spare fails for any reason, the hot spare drive will be marked as "failed". If the source drive fails, both the source drive and the hot spare drive will be marked as "failed". There are two types of hot spares: • Global hot spare • Dedicated hot spare 2.4.13.1 Global Hot Spare A global hot spare drive can be used to replace any failed drive in a redundant drive group as long as its capacity is equal to or larger than the coerced capacity of the failed drive. A global hot spare defined on any channel should be available to replace a failed drive on both channels. 2.4.13.2 Dedicated Hot Spare A dedicated hot spare can be used to replace a failed drive only in a selected drive group. One or more drives can be designated as a member of a spare drive pool. The most suitable drive from the pool is selected for fail over. A dedicated hot spare is used before one from the global hot spare pool. Hot spare drives can be located on any RAID channel. Standby hot spares (not being used in RAID drive group) are polled every 60 seconds at a minimum, and their status made available in the drive group management software. RAID controllers offer the ability to rebuild with a disk that is in a system, but not initially set to be a hot spare. Observe the following parameters when using hot spares: • Hot spares are used only in drive groups with redundancy: RAID levels 1, 5, 6, 10, 50, and 60. • A hot spare connected to a specific RAID controller can be used to rebuild a drive that is connected to the same controller only. 2-12 Introduction to RAID
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