After recovering from a failed raid6, now running with 2 missing drives and soon to be finally backed up (is still backing up), I have 2 related questions... The first is, can I add in both drives at the same time, or do I need to add them in singly, just checking for clarity? The second question is far more important... during the re-creation of data on the newly added missing disk/partition(s) does mdadm just read the data from the original array and write to the new disk(s) or does it potentially write new/update existing data (excluding bitmap/superblock) to the existing disks. My reason for asking about what gets written where is because I re-purposed the pulled (2) disks along with another that I had laying around to use as a temporary backup medium... one of the pulled disks suddenly re-mapped over a thousand sectors (i'm fairly sure it was in the thousand, but the disk is now reporting immediate fail imminent in smart and and in reality when it was taring to it, it totally locked up) but then again the disk was over 5 years of "powered up" time... I'm suprised it had not failed sooner so I am now rather worried that although periodic scrubs (first sun/month) have reported no problems that if one of the existing 4 disks gets heavy writes it will fail but "might" just last long enough in a heavy read situation (and in fact no problems are reported so far in the backup process) to get at least 1 disk redundancy back into the array. Thanks in advance. Jon -- 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
