Am 28.11.22 um 17:51 schrieb Roger Heflin:
It depends on why the drive fails.
My operational experience is a complete drive failure is rare
i stopped to count the replaced HDDs in the past 20 years
Most of the failures are a bad sector
replacement case when it makes it up to the layer where mdadm even has
to act
and/or a transient interface error
won't trigger a rebuild - thats waht write intent bitmaps are for
on my sliced setup most of the time only result in a single
slice/partition getting kicked and needing a re-add.
hwo can a single parition disappear and others not?
And the slicing
does make each grow step smaller/faster, and it also allows one to play
games with different sized disks being sliced.
smaller but NOT faster
My setup started with 1.5TB disks sliced into 2, and then when I went to
3TB disks sliced into 4, and allows mixing and matching underlying disk
sizes for a system with some disks of each. My 6's have 6 slices
(4x.75TB, 2x1.5TB).
yeah makes sense to sepearte os/data and so on but the OP at the end of
the day thows LVM and/or another RAID-layer on top to end with a singe
big storage where all that partition slicing is nonsense
On Mon, Nov 28, 2022 at 10:06 AM Reindl Harald <h.reindl@xxxxxxxxxxxxx
<mailto:h.reindl@xxxxxxxxxxxxx>> wrote:
Am 28.11.22 um 15:46 schrieb David T-G:
> I don't at this time have a device free to plug in locally to
back up the
> volume to destroy and rebuild as linear, so that will have to
wait. When
> I do get that chance, though, will that help me get to the
awesome goal
> of actually INCREASING performance by including a RAID0 layer?
stacking layers over layers will *never* increase performance - a pure
RAID0 will but if one disk is dead all is lost
additional RAID0 on top or below another RAID won't help
your main problem starts by slicing your drives in dozens of partitions
and "the idea being that each piece of which should take less time to
rebuild if something fails"
when a drive fails all your partitions on that drive are gone - so
rebuild isn't faster at the end
with that slicing and layers over layers you get unpredictable
head-movemnets slowing things down
keep it SIMPLE!
