×
The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.
Charles Wilt wrote on Tue, 18 Nov 2008 19:17:13 GMT:
But I don't know where the Striping done for a RAID-5/RAID-6
is done. It would make sense for the controller to do it, and
from what Sue says, that is the case now. But I don't believe
it's always been the case.
Striping has been called scatter loading since the days of S/38
and is in effect RAID0 done by the operating system.
Back in the bygone S/38 days and carried forward to the AS/400
(up through V3 if I remember right), we had checksum protection
which was kind of like RAID5 but it was done by the operating
system.
Along came disk mirroring, which is analogous to RAID10, but it
is done by the operating system as opposed to the disk
controller. This means that more components between the
processor and the disk units can be made redundant. Other
operating systems can only do RAID10 at the disk controller
level.
RAID5 and RAID6 parity striping is done by the disk controllers
(IOAs) and controlled (turned on/off, inclusion/exclusion of disk
units in a parity set) by LIC via service tools. Other operating
systems do it similarly but utilize unique device drivers or DLLs
to turn on/off.
midrange.com
