Over the years since there first pure RAID-5 box STK has made many incremental improvements. The improvements have been in the areas of reliability by adding additional parity to the original RAID-5. The compression algorithms that they added have helped capacity. They have also greatly improved performance.
[EMAIL PROTECTED] wrote:
On Tue, 2004-05-11 at 10:58, Stephen Frazier wrote:
STK uses what they call RAID 6.
Yes, that's what it says in Scott's paper, which I referenced.
However, RAID 6 is RAID 5 with some STK enhancements for improved performance and reliability.
RAID 6 implements multiple parity blocks. Depending on the implementation they might be applied orthogonally, but I don't think this is canon.
Because LSF only writes to disk areas that are logically zero, there has likely been substantial change to the parity generation algorithm.
The performance characteristics of even the original Iceberg were vastly different from that of a pure RAID-5 box that was being marketed by STK at the time.
-- David Andrews A. Duda and Sons, Inc. [EMAIL PROTECTED]
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-- Stephen Frazier Information Technology Unit Oklahoma Department of Corrections 3400 Martin Luther King Oklahoma City, Ok, 73111-4298 Tel.: (405) 425-2549 Fax: (405) 425-2554 Pager: (405) 690-1828 email: stevef%doc.state.ok.us
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