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ZFS best practices with hardware RAID

If one happens to have some server-grade hardware at ones disposal, is it ever advisable to run ZFS on top of a hardware-based RAID1 or some such? Should one turn off the hardware-based RAID, and run ZFS on a mirror or a raidz zpool instead?



With the hardware RAID functionality turned off, are hardware-RAID-based SATA2 and SAS controllers more or less likely to hide read and write errors than non-hardware-RAID controllers would?




In terms of non-customisable servers, if one has a situation where a hardware RAID controller is effectively cost-neutral (or even lowers the cost of the pre-built server offering, since its presence improves the likelihood of the hosting company providing complementary IPMI access), should it at all be avoided? But should it be sought after?

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