On 1/5/2012 9:40 AM, Peter W. Morreale wrote: > Assume a portion of disk 1 goes 'bad' (localized within one of those > partitions), is noticed by md and a rebuild is warranted. How often does only a "portion" of a disk go bad these days? Typically this would mean unrecoverable read/write errors for a set of LBA sectors. Physically, with the majority of today's disks, these perceived sector defects are actually the result of head actuator and/or spindle bearing wear beyond tolerances, not magnetic defects in the platters. Thus, any such defective "portions" are typically doing to "grow" fairly rapidly. Which means, in your scenario, both arrays are going to need new spare partitions and a rebuild in short order, as an entire disk is failing, not just a portion thereof. RAID - Redundant Array of Inexpensive Disks RAIP - Redundant Array of Inexpensive Partitions Aside from sounding like a sexual crime, there are many other obvious reasons why the latter has never been coined nor considered a storage standard by anyone. There are valid reasons for partition based arrays, such as booting from disks with wonky offset requirements (e.g. advanced format drives). IMHO the scenario you've presented here is not a valid case for partition based arrays. -- Stan -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
