Raid 6 in use ? - Reactivation

In article ,
Curious George wrote:

viable levels. I cannot comprehend it in the low-end enthusiast
market - where it is presently being very hyped-up.

Actually, the only hype is in the post above.

Bill Todd writes:
About a minute Googling for raid-dp at www.netapp.com yielded
http://www.netapp.com/tech_library/3298.html?fmt=print

Thanks, that's interesting.

NetApp RAID DP has been around in their ONTAP 6.5 architecture for
around a year. In fact, if you buy a nearstore, they use it by default
to provide the redundancy you'd need for a ATA device due to the
rebuild time and risk exposure of having RAID 5 and ATA drives (rebuild
times instead of 40 minutes takes hours). I think they are the only
vendor to do this, but they are the largest player in the NAS market,
so it's not occuring on a small scale.

NetApp recommends that customers use it on all of their volume where
you can afford the extra costs of another drive in their RAID sets
because unlike other RAID levels, it can protect you against ANY two
drives failing simultaneously in the same RAID set (unlike mirroring or
RAID 5). We've been using it on several of our devices for around a
year with no adverse affects.

Joshua Baker-LePain wrote in message ...

Probably not what you're looking for, but search the archives of
either linux-kernel or linux-raid. The 2.6 kernel has a software
implementation of RAID 6 that I do believe some folks are using
in production. Also, for an internal product, the new Areca SATA
RAID controller claims to do RAID 6.

Thanks Josh for your input. But your info is probably the only one
positive and real world connected in this thread ...
I simply can find no good word for answers saying: "you are stupid guy
(i.e. idiot) if you are looking for nonexistent Raid6" ... The same
answer from this community I got a 1.5 year ago for a query on
SATA-to-SCSI boxes. Now I have 30TB storage (archival) running on such
boxes. Moreover big vendor also offer nowadays SATA raid storage ...
But these everything-knowing "gurus" still claim: the only STORAGE is
fibre channel and raid-1 (oh maybe somethimes raid-5, but parity is
abominable thing)
Ofc I use super-hiper EMC/HP/Hitachi snapping/gapping everything-doing
FC & SCSI 15k arrays for oracle DBs. But rarely accessed data &
archival backups I keep on SATA storage... And I am satisfied !

AL

writes:

RAID-6, which are highly non-equivalent. The ones commonly labelled
RAID-6 seems to be either PQ-parity, or the EVENODD scheme described
in the Menon/BBB papers (the three other authors all have names that
start with B). Furthermore, today there are many more interesting

FWIW, that paper is available at:

http://www.cs.berkeley.edu/~culler/c...p245-blaum.pdf

--
David Magda dmagda at ee.ryerson.ca
Because the innovator has for enemies all those who have done well under
the old conditions, and lukewarm defenders in those who may do well
under the new. -- Niccolo Machiavelli, _The Prince_, Chapter VI