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127 Posts
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May 21st, 2008 00:00
write-cache
Hi All
I would like to find out what are the normal circumstances when the write cache of a Clariion is disabled.
As I know of when one of the disks that stores the Flare code is dead, the write-cache is automatically disabled. When its replaced, and synced up, it will automatically be enabled.
Whats the primary purpose of the write-cache being disabled? is it to protect the Flare code from being corrupted or something?
Thanks
Zainal
I would like to find out what are the normal circumstances when the write cache of a Clariion is disabled.
As I know of when one of the disks that stores the Flare code is dead, the write-cache is automatically disabled. When its replaced, and synced up, it will automatically be enabled.
Whats the primary purpose of the write-cache being disabled? is it to protect the Flare code from being corrupted or something?
Thanks
Zainal
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Kiran3
410 Posts
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May 21st, 2008 01:00
1. redundancy of array is lost due to loss of power, processor, backend etc...
2. loss of any one of the vault disk (first five disks in first enclosure)
write cache contains modified but cached data on luns ... for an application or host point of view, array has confirmed that this data is written on disk...but if array looses this changes before they are written to disks, this commitment is no longer trusting...hence the write cache is immediately copied to separate location on disks (if complete power is lost) or on respective disk locations (if power is present but components are faulted)...to prevent data loss