Fast data recovery from HDD failure
First Claim
1. A storage system comprising:
- a plurality of drives configuring a first RAID group and a second RAID group;
a controller being configured to;
store first M data and first N parity data into first M+N parcels of first M+N drives included in the first RAID group, and second M data and second N parity data into second M+N parcels of second M+N drives included in the first RAID group, where the M and N are integers, wherein one of the drives in the first RAID group stores one of the first M+N parcels and one of the second M+N parcels, and another one of the drives in the first RAID group stores one of the first M+N parcels or one of the second M+N parcels; and
for a failure that has occurred on one of the first M+N drives, recover one of the first M+N parcels which is stored in the failed one of the first M+N drives by utilizing other first M+N parcels, and copy the recovered one of the first M+N parcels and the other first M+N parcels to M+N parcels of M+N drives included in the second RAID group.
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Abstract
A storage system comprises a first storage device having a first plurality of hard disk drives and a first controller. The first controller stores data in the first plurality of hard disk drives by stripes. Each stripe includes M data and N parity data allocated to M+N hard disk drives of the first plurality of hard disk drives. A first hard disk drive includes data or parity data of both a first stripe of the stripes and a second stripe of the stripes, while a second hard disk drive includes data or parity data of only one of the first stripe or the second stripe. During data recovery involving failure of one of the first plurality of hard disk drives, the data in the failed hard disk drive is recovered for each stripe by calculation using data and parity data in other hard disk drives for each stripe.
23 Citations
14 Claims
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1. A storage system comprising:
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a plurality of drives configuring a first RAID group and a second RAID group; a controller being configured to; store first M data and first N parity data into first M+N parcels of first M+N drives included in the first RAID group, and second M data and second N parity data into second M+N parcels of second M+N drives included in the first RAID group, where the M and N are integers, wherein one of the drives in the first RAID group stores one of the first M+N parcels and one of the second M+N parcels, and another one of the drives in the first RAID group stores one of the first M+N parcels or one of the second M+N parcels; and for a failure that has occurred on one of the first M+N drives, recover one of the first M+N parcels which is stored in the failed one of the first M+N drives by utilizing other first M+N parcels, and copy the recovered one of the first M+N parcels and the other first M+N parcels to M+N parcels of M+N drives included in the second RAID group. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A storage management method for a storage system, wherein the storage system has a plurality of drives configuring a first RAID group and a second RAID group, and has a controller, the method comprising:
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storing first M data and first N parity data into first M+N parcels of first M+N drives included in the first RAID group, and second M data and second N parity data into second M+N parcels of second M+N drives included in the first RAID group, where the M and N are integers, wherein one of the drives in the first RAID group stores one of the first M+N parcels and one of the second M+N parcels, and another one of the drives in the first RAID group stores one of the first M+N parcels or one of the second M+N parcels; and for a failure that has occurred on one of the first M+N drives, recovering one of the first M+N parcels which is stored in the failed one of the first M+N drives by utilizing other first M+N parcels, and copy the recovered one of the first M+N parcels and the other first M+N parcels to M+N parcels of M+N drives included in the second RAID group. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification