Previously Ingo Seibold said:
about how many percent goes the benchmarkable speed down when I change a
RAID0 Sytem with 4 hard disks to a RAID5 System?
If you have reasonably fast disks the read speed will be limited by
the PCI speed, unless you have 66MHz PCI, 64 bit PCI or PCI-E and a
matching RAID controller. Write speed depends on the card. I have had
an Adaptec SATA RAID5 card reading and writing slower than Linux
software RAID.
In short: Reading should be about the same, maybe a bit (25%) slower.
Writing is impossible to tell without knoing the details of the
RAID% and the RAID0 solution being compared. Usually knowing
the details will still not be enough and actual benchmarking
is the only option.
And of course it depends on the specific benchmark used.
Arno