SSD SAS and SSD Sata - what is the key difference in simple language?
There are differences between drives, and between the interface in the first place.
The main difference SAS
- The extended SCSI command set, unlike normal ATA command.
- Multipath I/O and all the wealth of choice available to them.
- The length of the command queue 256 in contrast 32двух
Well, even the little things. For desktop systems all these advantages are quite strange and unnecessary, but in servers without them often does.
Enterprise SSD and Desktop SSD
The main differences
- CPU - needs to be very productive and able to collect garbage in the background without interfering with the work.
- Reserve cells - should be decent enough to ensure that the garbage collector had to clean even at high load
- Memory. well then clear it for the cache and for the work of the garbage collector.
- Optimized the firmware of the controller - specialized chips to work in a server environment, such as the ability to work in the mountains.
Why when using SSD is recommended to mark only 70% of the total? Relevant this advice on server hardware?
Relevant this advice is primarily on server hardware, although can be useful in certain cases when the desktop nature of the load.
Not necessarily 70% - at very high load can be more and less.
The essence of this action - increase in reserve, net of cells.
On desktops, in principle, at low load to cope TRIM, and TRIM on the servers often does not work, and even if it works at high load nothing from him.
But the reserve cells save.