raid3 is slow

[Dag-Erling Smørgrav]

Szabó Péter <matyee at mail.alba.hu> writes:
> # graid3 list
>
> Geom name: nmivol
> State: DEGRADED

First of all, your array is degraded.  The graid3 output shows only
four components.  Unless the missing fifth component happens to be the
parity disk, geom_raid3 will have to reconstruct your data on the fly.

Second, you say nothing about which spindles the components are on and
how those spindles are attached to the system.  If some of those
components are on the same spindle, or if some of those spindles are
on the same ATA channel, performance will suffer considerably.

DES
-- 
Dag-Erling Smørgrav - des at des.no