Which Distributed Storage Fabric (DSF) component is responsible for staging the area to handle bursts of random writes, coalescing them, and then sequentially draining the data to the persistent…

The correct answer is A. Oplog. The Oplog is Nutanix's write-staging journal within the Distributed Storage Fabric. When a VM issues a burst of random write I/Os, they are immediately acknowledged and written to the Oplog (stored on SSD-tier storage on the CVM), converting random writes into a fast…

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Question

Which Distributed Storage Fabric (DSF) component is responsible for staging the area to handle bursts of random writes, coalescing them, and then sequentially draining the data to the persistent storage?

Options

AOplog
BExtend Store
CvBlock
DUnified cache

How the community answered

(44 responses)

A
93% (41)
B
5% (2)
C
2% (1)

Explanation

The Oplog is Nutanix's write-staging journal within the Distributed Storage Fabric. When a VM issues a burst of random write I/Os, they are immediately acknowledged and written to the Oplog (stored on SSD-tier storage on the CVM), converting random writes into a fast, sequential log operation. The Oplog then coalesces these writes and drains them sequentially to the Extent Store (persistent storage) during periods of lower I/O activity. This dramatically reduces write latency seen by the guest VM. The Extent Store (B) is the persistent data store, not the staging area. vBlocks (C) are logical data units within the Extent Store. The Unified Cache (D) accelerates read I/O, not write staging.

Topics

#Nutanix Architecture#Distributed Storage Fabric#Oplog#Write I/O Path

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