New
#1
For the write caching experts
On another thread I had stated that there will be a performance hit if you turn off write caching for a SSD. But on second thought, I am not so sure any more.
What write caching allows (in my understanding) is to accumulate records in a buffer so that so that they can be written to the disk in one big swoop. That is an advantage on a spinning disk because all those records are written during the same rotation - and there is also only one seek for the arm.
I wonder though whether that brings the same advantage to the SSD where access time to any place is the same - and it is usually only 0.1ms. There would be an advantage if the records were written in larger blocks from the buffer because the SSD's write performance grows as the block size grows. But if records are still being written e.g. 4K at a time, there may not be an advantage.
Does anybody know whether the blocksize for the write operations increases with caching?