Re: Disk I/O slowness

Hi,

On Fri, Jul 31, 2026 at 12:04:30AM +0500, Alexander V. Makartsev wrote:
> I might add insult to the injury, but are you sure you need RAID-5 if it
> consists of just 3 drives?
> Usually around 30% per drive's capacity will be sacrificed to hold error
> correction data for the array,
> so maybe it will be much better to use 2 drives in RAID-1 (Mirror)
> configuration, if you need decent write performance.
> Third drive could be used as spare device for the array, or a separate
> storage without redundancy.

On Linux mdadm you can also do a RAID-10 across three drives which still
allows for the loss of any single drive and provides both better read
and write performance compared to RAID-5 of the same devices. The
capacity would be 1.5 drives as opposed to 2.

However, if those really are 5.4kRPM SMR drives, I personally would not
want to use them for anything.

Thanks,
Andy