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Table 3 Block device parameters in use for performance evaluation

From: Host managed contention avoidance storage solutions for Big Data

Block device Default parameters
HDD Maximum “request” structure size = 512 kB
Request queue size = 256 BIO structures (128 reads, 128 writes)
Max. size of each block I/O (BIO) structure = 128 × 4K pages
1 page (bio vec) = 8 × 512-byte disk sectors (block)
Access granularity (disk block sector size) = 512 bytes
Specification based exactly as our 250 GB Hadoop cluster HDD
SSD Block size = 256 pages; page size = 4 kB = access granularity
Access time: read = 0.025 ms; write = 0.5 ms
Specification based on SLC Flash SSD [9]