Snapshot coordination
First Claim
Patent Images
1. A method, performed by one or more computing devices, comprising:
- handling by a SAN array one or more control plane tasks related to connectivity and one or more snapshots;
creating a logical unit number (LUN) on the SAN array;
coupling communicatively a host cache to the SAN array, wherein non-data network communications between the SAN array and the host cache are used to manage the connectivity and coordinate one or more snapshot requests, wherein the non-data network communications comprises a virtual IP address interface;
creating a cached LUN at the host cache, wherein the cached LUN represents the caching instance of the LUN across a plurality of servers;
receiving at the host cache, a first request to prepare a volume of the host cache for creating a snapshot of the cached LUN wherein the first request indicates that a snapshot of the cached LUN will be taken;
preparing, in response to the first request, the volume of the host cache for creating the snapshot of the cached LUN, wherein preparing the volume of the host cache is dependent on a mode of the host cache, wherein the mode of the host cache comprises at least one of write-through (WT), write-back (WB), or write-back-write-through (WB-WT) switching, and wherein preparing the volume comprises;
flushing a set of data comprising at least one snapshot of the cached LUN when the host cache is in WB or WB-WT switching modes;
switching the host cache to WT mode when the host cache is in WB-WT switching mode; and
sending a message indicating that the volume is prepared for creating the snapshot of the cached LUN;
receiving, at the host cache, a second request to create the snapshot of the cached LUN;
in response to the second request, creating, at the host cache, the snapshot of the cached LUN;
switching the host cache to WB mode when the host cache is in WB-WT switching mode;
sending by the host cache a flush complete message to the SAN array to complete movement of the snapshot to the SAN array and to complete creation of the snapshot; and
deleting by the cached LUN, the snapshot.
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Abstract
In one embodiment, a method performed by one or more computing devices includes receiving at a host cache, a first request to prepare a volume of the host cache for creating a snapshot of a cached logical unit number (LUN), the request indicating that a snapshot of the cached LUN will be taken, preparing, in response to the first request, the volume of the host cache for creating the snapshot of the cached LUN depending on a mode of the host cache, receiving, at the host cache, a second request to create the snapshot of the cached LUN, and in response to the second request, creating, at the host cache, the snapshot of the cached LUN.
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Citations
20 Claims
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1. A method, performed by one or more computing devices, comprising:
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handling by a SAN array one or more control plane tasks related to connectivity and one or more snapshots; creating a logical unit number (LUN) on the SAN array; coupling communicatively a host cache to the SAN array, wherein non-data network communications between the SAN array and the host cache are used to manage the connectivity and coordinate one or more snapshot requests, wherein the non-data network communications comprises a virtual IP address interface; creating a cached LUN at the host cache, wherein the cached LUN represents the caching instance of the LUN across a plurality of servers; receiving at the host cache, a first request to prepare a volume of the host cache for creating a snapshot of the cached LUN wherein the first request indicates that a snapshot of the cached LUN will be taken; preparing, in response to the first request, the volume of the host cache for creating the snapshot of the cached LUN, wherein preparing the volume of the host cache is dependent on a mode of the host cache, wherein the mode of the host cache comprises at least one of write-through (WT), write-back (WB), or write-back-write-through (WB-WT) switching, and wherein preparing the volume comprises; flushing a set of data comprising at least one snapshot of the cached LUN when the host cache is in WB or WB-WT switching modes; switching the host cache to WT mode when the host cache is in WB-WT switching mode; and sending a message indicating that the volume is prepared for creating the snapshot of the cached LUN; receiving, at the host cache, a second request to create the snapshot of the cached LUN;
in response to the second request, creating, at the host cache, the snapshot of the cached LUN;switching the host cache to WB mode when the host cache is in WB-WT switching mode; sending by the host cache a flush complete message to the SAN array to complete movement of the snapshot to the SAN array and to complete creation of the snapshot; and deleting by the cached LUN, the snapshot. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system comprising:
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a SAN array, wherein the SAN array handles one or more control plane tasks related to connectivity and one or more snapshots; a memory comprising instructions executable by one or more processors; and the one or more processors coupled to the memory and operable to execute the instructions, the one or more processors being operable when executing the instructions to; create a logical unit number (LUN) on the SAN array; communicatively couple a host cache to the SAN array, wherein non-data network communications between the SAN array and the host cache are used to manage the connectivity and coordinate one or more snapshot requests, wherein the non-data network communications comprises a virtual IP address interface; create a cached LUN at the host cache, wherein the cached LUN represents the caching instance of the LUN across a plurality of servers; receive at the host cache, a first request to prepare a volume of the host cache for creating a snapshot of the cached wherein the first request indicates that a snapshot of the cached LUN will be taken; prepare, in response to the first request, the volume of the host cache for creating the snapshot of the cached LUN, wherein preparing the volume of the host cache is dependent on a mode of the host cache, wherein the mode of the host cache comprises at least one of write-through (WT), write-back (WB), or write-back-write-through (WB-WT) switching, and wherein preparing the volume comprises; flush a set of data comprising at least one snapshot of the cached LUN when the host cache is in WB or WB-WT switching modes; switch the host cache to WT mode when the host cache is in WB-WT switching mode; and send a message indicating that the volume is prepared for creating the snapshot of the cached LUN; receive, at the host cache, a second request to create the snapshot of the cached LUN; in response to the second request, create, at the host cache, the snapshot of the cached LUN; switch the host cache to WB mode when the host cache is in WB-WT switching mode; send, by the host cache, a flush complete message to the SAN array to complete movement of the snapshot to the SAN array and to complete creation of the snapshot; and delete, by the cached LUN, the snapshot. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. One or more computer-readable non-transitory storage media embodying software operable when executed by one or more computer systems to:
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handle, by a SAN array, one or more control plane tasks related to connectivity and one or more snapshots; create a logical unit number (LUN) on the SAN array; communicatively couple a host cache to the SAN array, wherein non-data network communications between the SAN array and the host cache are used to manage the connectivity and coordinate one or more snapshot requests, wherein the non-data network communications comprises a virtual IP address interface; create a cached LUN at the host cache, wherein the cached LUN represents the caching instance of the LUN across a plurality of servers; receive at the host cache, a first request to prepare a volume of the host cache for creating a snapshot of the cached LUN wherein the first request indicates that a snapshot of the cached LUN will be taken; prepare, in response to the first request, the volume of the host cache for creating the snapshot of the cached LUN, wherein prepare the volume of the host cache is dependent on a mode of the host cache, wherein the mode of the host cache comprises at least one of write-through (WT), write-back (WB), or write-back-write-through (WB-WT) switching, and wherein prepare the volume comprises; flush a set of data comprising at least one snapshot of the cached LUN when the host cache is in WB or WB-WT switching modes; switch the host cache to WT mode when the host cache is in WB-WT switching mode; and send a message indicating that the volume is prepared for creating the snapshot of the cached LUN; receive, at the host cache, a second request to create the snapshot of the cached LUN; in response to the second request, create, at the host cache, the snapshot of the cached LUN; switch the host cache to WB mode when the host cache is in WB-WT switching mode; send, by the host cache, a flush complete message to the SAN array to complete movement of the snapshot to the SAN array and to complete creation of the snapshot; and delete, by the cached LUN, the snapshot. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification