Hi William,
SOmething to think about. Let's suppose a channel/cable completely dies. How would you protect against it? Split a logical mirror device over 2 channels.
This effectively implements RAID 0+1, right? RAID 1 (mirroring) over RAID 0 striped volumes. I can certainly see your point regarding the redundancy of the controller channels, but my understanding is that (apart from that) RAID 0+1 is less robust that RAID 10 regarding disk failures. Presuming that the system will continue to operate even in the event of 1 channel failure, it's still not a clear choice. Does that seem like a reasonable assessment?
Another trick I've started doing with my MegaRAID setups is mirroring in hardware but striping in software.
Yeah, that is a good point. I havn't decided either way but I consider that a viable option.
If you were building this system now, and want the option of buying the same disks in 3 years time, do you think it would be a bad idea to go for the ~40GB size? Maybe the next size up would be better, though we don't actually need the extra space.
If you have any specific recommendations (for or against) specific drives/manufacturers, please let me know.
Also, someone asked me what happens if one of the CPUs fails on this system, will the system continue to operate on 1 CPU. I havn't really considered this, and have never read anything either way, so my assumption is "no, it won't". Any comment?
Thanks again
Iain
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