US 10,310,984 B2Granted

Storage apparatus and storage control method

AssigneeHitachi, Ltd.

InventorAtsushi Kawamura

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Abstract

A storage apparatus includes a first storage device and a second storage device, out of logical-physical translation information which associates a logical page and a physical page in the second storage device with each other. Non-compressed logical-physical translation information in the first storage device is assumed to constitute a first tier, compressed logical-physical translation information in the first storage device is assumed to constitute a second tier, and compressed logical-physical translation information in the second storage device is assumed to constitute a third tier. The storage apparatus includes tier management information for managing which logical page is included in logical-physical translation information of which of the first tier, the second tier, and the third tier. When receiving an I/O with respect to the logical page, the storage apparatus retrieves the logical-physical translation information including the logical page for which the I/O has been received, based on the tier management information.

Claims10

Dependent claims

A storage apparatus, comprising:

a first storage device;
a second storage device;
and
a controller configured to control the first storage device and the second storage device,
in logical-physical translation information which associates logical pages constituting a logical storage area of the second storage device and physical pages constituting a physical storage area of the second storage device with each other,
the logical-physical translation information stored in a non-compressed state in the first storage device belongs to a first tier
the logical-physical translation information stored in a compressed state in the first storage device belongs to a second tier, and
the logical-physical translation information stored in a compressed state in the second storage device belongs to a third tier,
the controller being configured to include tier management information for managing which logical page is included in the logical-physical translation information of which of the first tier, the second tier, and the third tier, and
the controller being configured to, when receiving an I/O (Input/Output) with respect to a logical page, retrieve the logical-physical translation information including information denoting the logical page for which the I/O has been received, based on the tier management information.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/510,594Filed 9 Oct 2014
Published: US 2017/0192903 A16 Jul 2017
Granted: 4 Jun 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G06F 12/10
In hierarchically structured memory systems, e.g. virtual memory systems: address translation
G06F 12/0246
Memory management in non-volatile memory, e.g. resistive RAM or ferroelectric memory: in block erasable memory, e.g. flash memory
G06F 12/1027
Address translation: using associative or pseudo-associative address translation means, e.g. translation look-aside buffer [TLB]
G06F 2212/7201
Details relating to flash memory management: logical to physical mapping or translation of blocks or pages

Family

US 2017/0192903 A1Pre-grant publication · published 6 Jul 2017
US 10,310,984 B2This patent

From the US filing history. Foreign family members aren’t listed.

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