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And so we enter day seven of King's College London major IT outage

TheVogon Silver badge

"For critical data, I'm now only using RAID 10"

That's very expensive on disks / slots though - so not ideal for many deployments. Most commonly in disk arrays these days SATA storage uses RAID 6 (or RAID DP), and SSD / FC uses RAID 5.

High end arrays also often have additional inbuilt error correction / redundancy striped across the RAID sets - for instance 3PAR does this...

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