Slow responses in redundant arrays of inexpensive disks

Details Slow responses in redundant arrays of inexpensive disks Slow responses in redundant arrays of inexpensive disks

Category

G - Physics

Subcategory

06

Subsubcategory

F

IPC codes

G06F 13/38 (2006.01) G06F 11/10 (2006.01)

Type

Patent

Patent number

CA 2365694

Description

A redundant array includes a plurality of disks, a bus coupling the disks, a receiving device, and a device to reconstruct a block stored in one of the disks. The device reconstructs the block with associated data parity blocks from other disks. The device transmits the reconstructed block to the receiving device (110) in response to the one of the disks being slowly responding (106). A method includes requesting a first disk to transmit a first block (104), reconstructing, when necessary, the first block from associated data stored in other disks of a RAID configuration, and transmitting the reconstructed block directly to a receiving device. The transmitting is in response to the first disk not transmitting the block in a predetermined time.

L'invention concerne un ensemble redondant comprenant une pluralité de disques, un bus couplant les disques, un dispositif récepteur et un dispositif permettant de reconstruire un bloc mis en mémoire dans l'un des disques. Le dispositif reconstruit le bloc avec des données associées et des blocs de parité provenant d'autres disques. Il transmet le bloc reconstruit au dispositif récepteur (110) lorsque la réaction (106) de l'un des disques est ralentie. Le procédé correspondant consiste à demander à un premier disque d'émettre un premier bloc (104); à reconstruire, si nécessaire, le premier bloc à partir des données associées mises en mémoire dans d'autres disques d'une configuration RAID; et à transmettre le bloc reconstruit directement à un dispositif récepteur. La transmission se fait lorsque le premier disque n'émet pas le bloc dans un temps prédéterminé.

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