On 2/10/22 11:19, John Mellor wrote:
SSDs have no appreciable seek time and have much faster read rates
that spinning rust. Depending upon how much onboard RAM cache they
provide (some even provide no cache), you may also see considerably
better burst write speed, although sustained write speeds are
generally no better than a disk.
Hard disk drives usually write sequentially at around 130MB/s. I've seen
QLC drives that aren't better than HDD, but unless you're buying
literally the slowest drives on the market, SSDs will probably write
*much* faster than HDD.
P.S: Why are you using a RAID-0 array? You have no redundancy,
higher
software complexity, somewhat better read speeds and much slower write
speeds
Most RAID levels will have slower writes than single disks for some
workload (usually small random writes on arrays with small numbers of
members). RAID0 is the only level I'd expect to be faster than a single
disk for all workloads.
When would you see much slower write speeds with RAID0?