| US 7,594,071 B2 | ||
| Storage system employing a hierarchical directory section and a cache directory section | ||
| Takashi Sakaguchi, Odawara (Japan); Sachiko Hoshino, Odawara (Japan); and Yasuyuki Nagasoe, Odawara (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on Jul. 28, 2006, as Appl. No. 11/494,516. | ||
| Application 11/494516 is a continuation of application No. 10/849832, filed on May 21, 2004, granted, now 7,167,950. | ||
| Claims priority of application No. 2004-052962 (JP), filed on Feb. 27, 2004. | ||
| Prior Publication US 2006/0265550 A1, Nov. 23, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G06F 12/00 (2006.01) | ||
| U.S. Cl. 711—113 [711/216] | 12 Claims |
| 1. A storage system, comprising:
a plurality of channel adapters for respectively controlling transmission and reception of data to and from a host device;
a plurality of storage device groups for respectively providing logical storage regions;
a plurality of disk adapters for respectively controlling transmission and reception of data to and from each of said storage
device groups;
a cache memory used respectively by each of said channel adapters and each of said disk adapters;
a control memory for storing management information groups for managing said cache memory; and
a cache managing unit for managing data to be stored in said cache memory by using said management information groups stored
in said control memory;
wherein said cache managing unit comprising a hierarchical directory section and a hash directory section, which operate in
parallel with each other;
said hierarchical directory section manages data in said cache memory and corresponding to said storage system, using a first
portion of said management information groups; and
said hash directory section manages data in said cache memory and corresponding to another storage system external to said
storage system, using a second portion of said management information groups other than said first portion.
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