December 2017
Beginner
598 pages
14h 7m
English
Content preview from Mastering VMware vSphere 6.5
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Flash devices
Flash storage has squeezed all the traditional rotating disks into one (or just two) tiers. Also, the cost is already competitive with 15K disks (just comparing the same capacity) and it's becoming more competitive with 10K disks also.
On the other side, flash storage provides a different type of low-level technologies for the NAND chips with a decreasing cost:
|
NAND cell types |
Bit per cell |
Performance |
Type of usage |
|
Single Level Cell (SLC) |
1-bit |
Fastest both on read and write |
Used for the write-intensive flash |
|
Enterprise Multi Level Cell (eMLC) |
2-bits |
Slower (as compared to SLC) on the write operation |
Used in enterprise storage for the read-intensive flash |
|
Multi Level Cell (MLC) |
2-bits |
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