STORAGE SYSTEM AND METHOD FOR CONTROLLING STORAGE SYSTEM

WIPO Patent Application WO/2015/186165

A1

　In a storage system, a scheme is used in which, during a power failure, the data stored in a volatile memory is saved to a nonvolatile memory so as not to lose the data in the volatile memory. In prior art, when the power is restored, all of the data saved to the nonvolatile memory is read out and written into the volatile memory. Then, operation as the storage system is resumed, and an access request from the host is accepted. Because this prior art requires that all of the data saved to the nonvolatile memory be read out, a period of time is needed before the acceptance of access requests is resumed, and availability is impaired. In order to overcome this problem, in the present invention, a cache directory and cache data are saved to the nonvolatile memory during a power failure, and, when the power is restored, the cache directory is copied from the nonvolatile memory into the volatile memory, the storage destination for the data which, as indicated by the cache directory, had the volatile memory as the storage destination before being saved is changed to the nonvolatile memory, and a host I/O process is initiated.

TAKADA MASANORI (JP)
YAMAMOTO AKIRA (JP)

PCT/JP2014/064572

December 10, 2015

June 02, 2014

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HITACHI LTD (JP)

G06F12/16; G06F3/06; G06F12/08

WO2010016115A1

2010-02-11

JP2008108026A	2008-05-08
JP2008158773A	2008-07-10
JP2013506885A	2013-02-28
JP2011524555A	2011-09-01
JP2009075759A	2009-04-09

INOUE Manabu et al. (JP)
Manabu Inoue (JP)

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