Data storage system and log data output method upon abnormality of storage control apparatus
AssigneeFujitsu Limited
InventorsMasahiro Yoshida, Takeshi Obata, Taichi Oono
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Abstract
A storage system have a plurality of control modules which control a plurality of disk storage devices, in which system information reading/writing is possible even when problems arise in paths with a plurality of disk devices, and moreover log data can be output even upon occurrence of an abnormality in a control module. A plurality of control modules has built-in a pair of system disk device units which store log data. Upon occurrence of an abnormality in one control module, a system disk unit of one control module is removed and mounted in another control module, and the log data of the mounted system disk unit is output by the another control module.
Claims16
A data storage system, comprising:
- a plurality of disk storage devices which store data;
- and
- a plurality of control modules, connected to said plurality of disk storage devices, which control access to said disk storage devices according to access instructions from a higher-level system,
- wherein each of said control modules comprises:
- a memory, having a cache area which stores a portion of the data stored by said disk storage devices;
- a control unit, which performs said access control;
- and
- a pair of system disk units, connected to said control unit, which store, at least the log data of said control unit;
- and wherein one control module, upon occurrence of an abnormality in another of said control modules, detects that one system disk unit of said another control module has been inserted into a system disk slot of said one control module, incorporates said one system disk unit of said another control module, and outputs log data of said one system disk unit of said another control module.
A log data output method upon an abnormality for a storage control apparatus having a plurality of control modules, connected to a plurality of disk storage devices which store data, which control access to said disk storage devices according to access instructions from a higher-level system, and in which each of said control modules has a memory having a cache area which stores a portion of the data stored by said disk storage devices, a control unit which performs said access control, and a pair of system disk units, connected to said control unit, which store at least the log data of said control unit, comprising the steps of:
- detecting, at the time of an abnormality in another control module, an insertion into a system disk slot of one control module of one system disk unit which has been removed from said another control module;
- incorporating said inserted one system disk unit of said another control module into said one control module;
- and
- outputting, using said one control module, log data of said incorporated one system disk unit of said another control module.
Dependencies are inferred from the claim text.