What is true about cache dirty page?
A.
Data that has changed but is not yet written to disk
B.
Data read from disk but not accessed by the host
C.
Data that has changed and has been written to disk
D.
Data requested by the host but not yet fetched
I think the answer should be A. The definition is:
Cache cleanpage-A page of FAST Cache that is valid and contains a copy of data that has been synchronized with the user LUN
Cache dirty page-A page of FAST CAche that is valid and contains the most recent copy of data, but has not yet been synchronized with the user LUN
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TrungMC: You are right. Correct answer will be – “A”
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“A” is what I have.
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Same here it should be A no dount
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Correct Answer is A.
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Question, if A is correct, and I believe it is, why does it take so long for this to be updated?
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A.
Data that has changed but is not yet written to disk
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“A”
“As cache fills, the storage system must take action to flush dirty pages (data written into the cache but not yet written to the disk) to manage space availability. Flushing is the process that commits data from cache to the disk.” Module: Intelligent Storage System.
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The answer is C
The page cache also aids in writing to a disk. Pages in the main memory that have been modified during writing data to disk are marked as “dirty” and have to be flushed to disk before they can be freed.
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I choose C
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As cache fi lls, the storage system must take action to fl ush dirty pages (data written
into the cache but not yet written to the disk) to manage space availability. Flushing is
the process that commits data from cache to the disk. On the basis of the I/O access
rate and pattern, high and low levels called watermarks are set in cache to manage
the fl ushing process. High watermark (HWM) is the cache utilization level at which
the storage system starts high-speed fl ushing of cache data. Low watermark (LWM)
is the point at which the storage system stops fl ushing data to the disks. The cache
utilization level, as shown in Figure 4-4, drives the mode of fl ushing to be used:
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