Jeff, I was musing about the (to me, novel) idea of multi RAID on one box (probably the head node of a cluster or subcluster), by analogy with CPU cache levels; RAID0 with a few 10K rpm drives for speed, RAID6 with many 7200 drives for size and reliability; then I'd be able to go fast until a failure, then rollback to a checkpoint served by the RAID6. This is just a gedankenexperiment. I don't have any particular configuration in mind, I don't have a cluster and it will probably be a small number of superannuated Alpha boxes if I do it at all this summer. Peter
On 8/27/07, Jeffrey B. Layton <[EMAIL PROTECTED]> wrote: > > Peter St. John wrote: > > How about using RAID 5 for a working filesystem and RAID 6 for > > checkpointing? Or is that effectively what 6+1 does? > > I'm imagining RAID 0 for scratch and virtual memory, so you want three > > disk systems:-) > > Peter > > Choosing good RAID solutions depends upon what you want to > do with the particular file system. For example, what do you > mean by "working file system", "check pointing" and so on? > You also have to take into account the RAID level, the size of > the disks, and the probability of a read error. This will help > you determine what RAID level to chose. > > I know this is vague, but we could continue this off-line if you > like (I don't know if anyone is interested in the details). > > Jeff > >
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