Tuning for SSDs

Lists the parameters to tune for optimal SSD performance.

On servers with SSDs:

Enable TRIM operation in the mfs.conf file, if recommended by the SSD vendor.
By default, TRIM is disabled. To enable, set the value for mfs.ssd.trim.enabled to 1 in the mfs.conf file. For example:
```
mfs.ssd.trim.enabled=1
```
Disable IO throttling in the mfs.conf file.
To disable, set the value for mfs.disk.iothrottle.count to 50000. The default value for mfs.disk.iothrottle.count is 100. For example:
```
mfs.disk.iothrottle.count=50000
```
Create storage pool with multiple SSDs (so that the throughput is less than 2GB/sec).
Note: Create one storage pool per SSD only if the device is high-end.
To create, run disksetup:
```
/opt/mapr/server/disksetup -W <n> disks.txt
```
For example, to create a storage pool with 2 SSDs, run the following command:
```
/opt/mapr/server/disksetup -W 2 disks.txt
```
For more information, see disksetup.