io scheduler for solidfire

[chalupaul]

Our testing shows the NOOP scheduler to significantly outperform the default scheduler for solidfire. In fact, we show a 2 second latency when moving a 1GB file to the array w/o noop. Would it be possible to set the io scheduler appropriately if solidfire is configured?

[willkelly]

This probably affects the other drivers that use iscsi as well, and we should look at possibly using udev to set iscsi device io schedulers to noop or similar.

[odyssey4me]

It may be best to have a default attribute overall which is then overridden by specific driver recipes if a different scheduler is found to work better for that driver.