System and method for controlling the updating of storage device

A system for controlling the updating of a storage device, wherein if data written into a primary storage device is copied into a secondary storage device, and if the data is copied into the secondary storage device, then a snapshot of the secondary storage device is accumulated in a storage device used for snapshots by copy-on-write, the system comprising:

• a storage region for storing a threshold value for a use rate of the storage device used for snapshots;
• and
• a processor which is operated by reading in at least one computer program;
• the processor acquires a use rate of the storage device used for snapshots, judges whether or not the acquired use rate has exceeded the threshold value, and stops the copy-on-write if the result of the judgment is affirmative.

A system for controlling the updating of a storage device, wherein if data is written into a primary storage device as a result of the reception of a write request by a file system, the data that is written into the primary storage device is copied into a secondary storage device that is logically connected to the primary storage device, and thus the data is copied into the secondary storage device, then a snapshot of the secondary storage device is accumulated in a storage device used for snapshots by copy-on-write,

• the system comprising a processor that is operated by reading in at least one computer program,
• wherein the processor sets a lock that is used to prohibit the updating of data corresponding to update data to be read out among the one or more sets of data accumulated in the primary storage device or the secondary storage device each time that update data is read out;
• acquires a lock waiting time which is a length of time that is required in order to set the each lock, an upper limit value of this lock waiting time, and a frequency threshold value;
• investigates the number of times that the lock waiting time exceeds the upper limit value to judge whether or not the number of times that the upper limit value has been exceeded exceeds the frequency threshold value;
• stops the reception of write requests by the file system if the result of this judgment is affirmative;
• and stops the copy-on-write by cutting off the logical connection between the primary storage device and the secondary storage device.

A method for controlling the updating of a storage device, wherein if the data that is written into a primary storage device is copied into a secondary storage device that is logically connected to the primary storage device, and if the data is copied into the secondary storage device, then a snapshot of the secondary storage device is accumulated in a storage device used for snapshots by copy-on-write,

• the method comprising the steps of:
• acquiring a use rate of the storage region used for snapshots;
• acquiring a threshold value for the use rate from the storage region;
• and
• judging whether or not the acquired use rate has exceeded the threshold value, and stopping the copy-on-write if the result of the judgment is affirmative.

A method for controlling the updating of a storage device, wherein if data is written into a primary storage device as a result of the reception of a write request by a file system, the data that is written into the primary storage device is copied into a secondary storage device that is logically connected to the primary storage device, and data is copied into the secondary storage device, then a snapshot of the secondary storage device is accumulated in a storage device used for snapshots by copy-on-write,

• the method comprising the steps of:
• setting a lock that is used to prohibit the updating of data corresponding to update data to be read out among one or more sets of data accumulated in the primary storage device or thesecondary storage device each time that update data is read out;
• acquiring a lock waiting time which is a length of time that is required in order to set theeach lock, an upper limit value of this lock waiting time, and a frequency threshold value;
• and
• investigating the number of times that the lock waiting time has exceeded the upper limit value to judge whether or not the number of times that theupper limit value has been exceeded exceeds the frequency threshold value, stopping the reception of write requests by the file system if the result of the judgment is affirmative, and stopping the copy-on-write by cutting off the logical connection between the primary storage device and the storage device.