The good old “auto” part of AutoRAID:)
Raid 5 has a large write penalty compared to RAID 1 since it has to
calculate the parity bit for each stripe. If you have the space RAID 1 Is
more performant so it’s the default RAID mode.
"He's old enough to know what's right and young enough not to choose it.
He's strong enough to win the world and weak enough to lose it." - Neal
Peart
On Tue, Dec 26, 2023 at 11:52 Tracy Johnson <
[log in to unmask]> wrote:
>
> Someone told me that unconfigured space on a 12H gets allocated toward
> Mirror instead of Raid. In order to get rid of Mirroring on the 12H you
> have to go into the ARM utilities in the shell and tell it *NOT* to do
> that.
>
>
>
> On 12/26/23 12:37, Mark Landin wrote:
> > The single SCSI bus is a more likely explanation than differing RAID
> > schemes, since RAID is supposed to be invisible to the file system.
> >
> > "He's old enough to know what's right and young enough not to choose it.
> > He's strong enough to win the world and weak enough to lose it." - Neal
> > Peart
> >
> >
> > On Tue, Dec 26, 2023 at 10:48 Tracy Johnson <
> > [log in to unmask]> wrote:
> >
> >> So the Empire machine is now fully upgraded from 28 year-old HASS arrays
> >> (Jamaica Drives) to a 25 year-old 12H autoraid array. I VSCLOSE'd the
> >> last _SET on the the last HASS and powered it off.
> >>
> >> The last RESTORE took 32 hours, disk to disk.
> >>
> >> I don't know why that was. Someone had the thought that the original
> >> data was backed up on a Mirror but the restore goes to Raid/5 but thinks
> >> it belongs on a Mirror and slows itself down trying to figure out where
> >> the sectors and extents really belong. But I'm thinking, "How do it
> >> know?" was it in the directory?
> >>
> >> Anyway the old machine is now up and available again. It does seem a
> >> bit faster.
> >>
> >> Next step, I may do another reload in a month or so to split the
> >> Controllers/LUNs/Discs between two FW/SCSI cards on the HP. It is
> >> currently on only one.
> >>
> >> --
> >> Tracy Johnson
> >> BT
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> NNNN
> >>
> >>
> >> * To join/leave the list, search archives, change list settings, *
> >> * etc., please visithttp://raven.utc.edu/archives/hp3000-l.html *
> >>
> > * To join/leave the list, search archives, change list settings, *
> > * etc., please visithttp://raven.utc.edu/archives/hp3000-l.html *
>
> --
> Tracy Johnson
> BT
>
>
>
>
>
>
>
> NNNN
>
>
> * To join/leave the list, search archives, change list settings, *
> * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
>
* To join/leave the list, search archives, change list settings, *
* etc., please visit http://raven.utc.edu/archives/hp3000-l.html *
|
