Hi all, any collective wisdom on what to do here? i've got a 4-disk raid5, and the most recent checkarray showed several bad blocks caused by uncorrectable read errors on two of the disks in the array. both disks in question show 0 reallocated sectors, but one looks like this: 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 16 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 16 and the other like this: 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 14 198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 3 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 11 i'm a bit worried about failing one of these disks for fear that the other might give uncorrectable read errors during the rebuild. if i *had* to choose one, should i choose the one with all the pending sectors, or the one with all the uncorrectable sectors? does it makes sense to do a smartctl -t offline scan on one or both of these disks first? i guess i could take the array offline, clone one of the disks with dd, and then swap the clone in. but... is there a way to clone one disk in the array using mdadm? in other words, is there a way to construct a clean copy of one of the disks even if there are raid-correctable read errors? i do have backups, so perhaps it will not kill me if the array dies, but i'd like to tread carefully and try and get out of this mess without nuking everything. thanks for any advice, rob -- 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
