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In a Windows or NetWare architecture, this can be performed online without disrupting system operation or causing data loss. Online RAID-level migration is illustrated in Figure 13-5. There might need to be unused drive space available on the array for the migration to be possible, depending on the initialĪnd final settings for the stripe size and RAID level. You can easily migrate a logical drive to a new RAID level. 13.3.4 Online RAID-Level MigrationĪll current HP array controllers support RAID-level migration. For basic disks, Windows does require SP3. For example, WindowsĢ000 requires at least SP3 if you are using dynamic disks. Some operating systems require updates or service packs to support volume or logical drive extension. Only operating systems that support volume extension can use the added capacity without losing data.
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Volume extension is illustrated in Figure 13-4. Logical drive is reported to the operating system. Performing a drive extension is the process of growing the size of a logical drive. The time required for data reallocation depends on the size of the RAID protection is maintained throughout reallocation. It can be assigned a high, medium, or low priority depending on the performance required when the data is reallocated. Depending on these factors, the expansion process takesĪll current HP Smart Array controllers support online array expansion without data loss. The priority level can be changed from low (the default in ACU) to medium or high to expand the volumes as quickly as possible. Server processor speed, the amount of I/O work the server is doing, and the priority level of the capacity expansion. The amount of time required to perform the online capacity expansion depends on several parameters, including drive speed, The server does not have to be powered down when disks are configured. Under Windows 2003, Windows 2000, Windows NT, Linux, and Novell NetWare, the ACU can be started online. For example, if a 10GB logical volume is expanded from four drives to six drives, the operating system is unaware The expansion process is independent of the operating It sees the old logical drive and a new logical drive. When the new logical drive is presented to the operating system after the expansion process, the operating system does not These zones on all drives are then available to create a new logical drive or extend the capacity of an existing
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Redistributing data across all the drives creates free space Figure 13-3 illustrates capacity expansion.įigure 13-3 How an online spare drive works.Īll data is relocated after the expansion process is started.
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To perform an online array expansion, install a new drive in a hot-pluggable drive bay and use the ACU to add the new drive to an existing array. Priority to low allows normal server performance, because rebuilding only occurs when the server is idle rebuild time canīe significantly longer depending on system activity. Selecting a high rebuild priority results in reduced server performance while the rebuild is in progress. On the new drive, the online spare switches back to its role as an online spare drive. Likely will not fail until the online drive has been rebuilt nevertheless, only ADG can handle two simultaneous drive failures in all cases.Īs soon as the failed drive is replaced, data is automatically rebuilt on the new drive. Spare drive has been completely rebuilt, the failure of a second drive can be handled without data loss. When a data drive fails, the online spare drive automatically starts to rebuild the data of the failed drive. All HP Smart Array controllers support up to four online spareįigure 13-2 How an online spare drive works. The capacity of the online spare must beĪt least as large as that of the other drives in the array. An online spare may beĪssigned to more than one array, if efficient use of drive capacity is important. One online spare drive can be added to any fault-tolerant logical drive (RAID 0 is not supported). The online spare drive acts as a temporary replacement for a failed drive, as illustrated in Figure 13-2. It is important for Accredited Integration Specialists to understand these technologies and features. Several key capabilities and technologies are implemented in HP array controllers, including the following:
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Learn More Buy 13.3 Array Controller Technologies and Capabilities HP ProLiant Servers AIS: Official Study Guide and Desk Reference