Flashcards
Storage 2
Cards in this deck (9)
- 1What is seek time front end command queuing?Seek time optimization: commands are executed based on optimizing r/w head movements which may result in the reordering of commands.
- 2What is a dirty page?Data that is in the cache but not written to disk.
- 3What is write-back cache and why is it useful?Data is placed in cache and an ACK is sent immediately to the host.
- 4How is the read efficiency of a storage system measured?Read hits - total number of reads
- 5What does a pre-fetch or read ahead algorithm do?Pre-fetch algorithm is used when read requests are sequential.
- 6When does idle cache flushing occur?Occurs continuously, at a modest rate when cache is between HWM and LWM on the way up.
- 7What is cache vaulting?In the event of extended power failures, batteries won't be available.
-Large amounts of data may need to be staged
-Usually a quick dump to an internal RAID 3 - 8What is a LUN and LUN masking?LUN - a number used to identify a logical unit, which is a device addressed by the SCSI protocol.
LUN Masking - Process of masking LUNs from unauthorized access. - 9What is Replication (from the perspective of intelligent storage)NOT SURE
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- Flashcards on Storage 2, created by michael.0lsn on 28/04/2016.
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- michael.0lsn
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