On-line disk array reconfiguration

A disk controller for passing host requests to a drive array while reconfiguring the drive array, the drive array having a source logical volume and a destination logical volume, pre-reconfiguration data being associated with the source logical volume and post-reconfiguration data being associated with the destination logical volume, comprising:

• detector logic for detecting if a host request to the disk array corresponds to post-reconfiguration data or pre-reconfiguration data;
• issuer logic for issuing the host request to the source logical volume if the host request corresponds to pre-reconfiguration data;
• and
• issuer logic for issuing the host request to the destination logical volume if the host request corresponds to post-reconfiguration data.

A computer system, comprising:

• a host computer;
• a disk drive array, the drive array having a source logical volume and a destination logical volume, pre-reconfiguration data being associated with a source logical volume and post-reconfiguration data being associated with the destination logical volume;
• and
• a disk controller for transferring data between the disk array and the host computer, the disk controller comprising:
• detector logic for detecting of a host request to the disk array corresponds to post-reconfiguration data or pre-configuration data;
• issuer logic for issuing the host request to the source logical volume if the host request corresponds to pre-reconfiguration data;
• and
• issuer logic for issuing the host request to the destination logical volume if the host request corresponds to post-reconfiguration data.

A processor readable medium storing code for performing the steps comprising:

• detecting if a host request to the drive array corresponds to post-reconfiguration data or pre-reconfiguration data;
• issuing the host request to a source logical volume if the host request corresponds to the pre-reconfiguration data;
• and
• issuing the host request to a destination logical volume if the host request corresponds to post-reconfiguration data.

A processor readable medium, comprising:

• detector code for detecting if a host request to a disk array corresponds to post-reconfiguration data or pre-reconfiguration data;
• issuer code for issuing the host request to a source logical volume if the host request corresponds to pre-reconfiguration data;
• and
• issuer code for issuing the host request to a destination logical volume if the host request corresponds to post-reconfiguration data.