2.1.4 File system consistency and Non-Volatile RAM
In most storage systems, RAID management and file services can put a heavy strain on write
performance. RAID uses a time-consuming read-modify-write sequence to maintain parity,
while file services tries to ensure that data is safely stored before replying to network
requests. WAFL reduces the impact of RAID management by writing to disk locations that
minimize RAID's write performance penalty.
Non-volatile RAM or NVRAM is special memory that is equipped with battery-backup that
allows it to store data for days, even when ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.