HP StorageWorks 70 HP StorageWorks Replication Solutions Manager 4.0.1 user gu - Page 144
Mirrorclone FAQ, Mirrorclone guidelines
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• Hardware protection. Compared to a snapshot, a mirrorclone is more hardware protected. (A snapshot must be in the same disk group as its source.) • Redundancy levels (Vraid). Compared to a snapshot, a mirrorclone can have higher redundancy levels. (A snapshot can only have the same or lower redundancy level as its source.) • Optimization. To optimize cost and performance, a can mirrorclone have a different type of physical disks than its source. The mirrorclone feature is controller software version dependent. See controller software features - local replication. Mirrorclone FAQ • How can I tell a mirrorclone from other types of virtual disks? Because mirrorclones are not independent virtual disks, they are identified differently than original (independent) virtual disks. See virtual disk types. • How long does it take to create a mirrorclone? A mirrorclone requires only a matter of seconds to create. • What do the terms synchronized and fractured refer to? When a mirrorclone is in a synchronized state, the local replication link to its source is active. Changes to data on the source are automatically replicated to the mirrorclone. When a mirrorclone is in a fractured state, the local replication link is inactive. Changes to data on the source are not replicated to the mirrorclone. See synchronized mirrorclones and fractured mirrorclones. • When can a host read from or write to a mirrorclone? Hosts can read from and write to fractured mirrorclones but not synchronized mirrorclones. • After I create a mirrorclone, can I delete the source virtual disk? No. • Can I make multiple mirrorclones of a virtual disk? No. See mirrorclone guidelines. • What is the maximum number of mirrorclones on a storage system? There is no limit. • Can I create a mirrorclone of a mirrorclone? No. • Can I create snapclones of a mirrorclone? No. • Can I create snapshots of a mirrorclone? Yes. • Can I create mirrorclones of virtual disks that are in DR groups? Yes, but only with specific versions of controller software. See controller software features - local replication Mirrorclone guidelines The following general guidelines apply: • The array must have a local replication license. See replication licenses overview. • A mirrorclone can be in a different disk group than its source. For optimum protection from hardware failures, HP recommends creating a mirrorclone in a different disk group than its source. (A mirrorclone is created in the same disk group as its source, unless specified otherwise.) • The redundancy (Vraid) level of a mirrorclone can be the same, lower, or higher than its source. See redundancy level (Vraid). • The maximum number of mirrorclones per source is one. • Neither the source disk or its mirrorclone can be a member of a DR group. • A detached mirrorclone cannot be reattached to its source. A mirrorclone cannot be created if the intended source virtual disk is: 144 Host volumes