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Connecting a storage subsystem and an electronic device with a control device that hides details of the storage subsystem

  • US 8,554,995 B2
  • Filed: 07/29/2008
  • Issued: 10/08/2013
  • Est. Priority Date: 07/29/2008
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • an external interface port to connect to an external electronic device, the external interface port to communicate over a communications path with the external electronic device according to a serial communication protocol;

    a storage interface port to connect to a storage subsystem having a plurality of logical storage volumes; and

    a control device to hide details of the storage subsystem from the external electronic device, the control device configured to;

    expand a storage capacity of at least one of the logical storage volumes,receive a request to migrate a RAID (Redundant Arrays of Inexpensive Disks) level of the storage subsystem from a first RAID level to a second, different RAID level,in response to receiving the request, wait for hot addition of at least one physical storage device to the storage subsystem;

    in response to detecting the hot addition of the at least one physical storage device, configure the hot-added at least one physical storage device, andafter configuring the hot-added at least one physical storage device, migrate data stored in the storage subsystem that includes the hot-added at least one physical storage device from the first RAID level to the second RAID level.

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