For optimal performance in terms of the storage layer, use disks backed by RAID-10. RAID-5 and RAID-6 do not typically provide sufficient performance to support a MongoDB deployment.

Avoid RAID-0 with MongoDB deployments. While RAID-0 provides good write performance, it also provides limited availability and can lead to reduced performance on read operations, particularly when using Amazon’s EBS volumes.


#mongodb #mongo #disk #raid #SSD

To check if the kernel knows about SSDs try:

for f in /sys/block/sd?/queue/rotational; do printf "$f is "; cat $f; done

When you run the command above, you will see results like below:

/sys/block/sda/queue/rotational is 1
/sys/block/sdb/queue/rotational is 1
/sys/block/sdc/queue/rotational is 0   <=== Only this is SSD!

#ssd #linux #hdd #rotational