First of all, I have no idea if this e-mail address is a part of a mailing list, so please CC me individually, or somehow reply to me personally. My goal: create a RAID 1 array between a partition on the hard drive and a ramdisk and mount this md array at /usr. Once poplulated, the vast majority of my programs will run out of RAM, and be very fast! I have 8 GB of RAM, so why not? On startup, the partition, which is a linux_raid_member, is detected as such, and /dev/md127 is automatically created. The problem: /dev/md127 is not usable. "sudo blkid /dev/md127" yeilds nothing. mdadm can't even query anything about it. Since this is RAID _one_ it should be able to function just fine with only one member, but it doesn't. In fact, to get it going again, I have to do: sudo mdadm --stop /dev/md127 sudo mdadm -A /dev/md127 -f /dev/sda2 #works at this point, now to add in the ramdisk: sudo mdadm /dev/md127 -a /dev/ram0 Then "sudo blkid /dev/md127" says that it's ext4 formatted, that it has a UUID, etc., and it is usable. After mounting it after fixing it, all my data is there. Problem restated: /usr needs to be mounted so early in startup that there is no script that I can have automate the fixing of my /usr RAID device in time for it to be mounted when it needs to be. I shouldn't even have to do that. It should just be functional from the get-go. I have a thread going on about this here: http://bbs.archbang.org/viewtopic.php?id=3179 . I have even tried renaming /sbin/mdadm to /sbin/mdadm.moved and doing "sudo /sbin/mdadm.moved --stop --scan" before shutdown, as mentioned here: http://neil.brown.name/blog/20120615073245#6 . After restart, the automatically generated md device for the found linux_raid_member partition is still unusable. I have tried both kernel 3.3.4-1-ARCH with mdadm 3.2.3-2 and kernel 3.4.7-1 with mdadm 3.2.5-2. The original idea for this came from here: https://bbs.archlinux.org/viewtopic.php?pid=493773#p493773 . I, of course, can't afford enough RAM to put the entirety of my installation in RAM, but I can afford to put /usr entirely in RAM. Can any of you folks help me out on this? Cheers, Jake -- 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
