* by 30x or more...
*
* We try and optimize the sleep time against what the underlying disk
- * can do, instead of having a static sleep time. This is usefull for
+ * can do, instead of having a static sleep time. This is useful for
* the case where our storage is so fast that it is more optimal to go
* ahead and force a flush and wait for the transaction to be committed
* than it is to wait for an arbitrary amount of time for new writers to