Archive for December, 2009

The need for triple-parity RAID

When I first wrote about triple-parity RAID in ZFS and the Sun Storage 7000 series, I alluded a looming requirement for triple-parity RAID due to a growing disparity between disk capacity and throughput. I’ve written an article in ACM Queue examining this phenomenon in detail, and making the case for triple-parity RAID. Dominic Kay helped [...]

Posted on December 21, 2009 at 6:09 pm by ahl · Permalink · 6 Comments
In: Fishworks

Logzillas: to mirror or stripe?

The Hybrid Storage Pool integrates flash into the storage hierarchy in two specific ways: as a massive read cache and as fast log devices. For read cache devices, Readzillas, there’s no need for redundant configurations; it’s a clean cache so the data necessarily also resides on disk. For log devices, Logzillas, redundancy is essential, but [...]

Posted on December 9, 2009 at 11:31 am by ahl · Permalink · 4 Comments
In: Fishworks