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You need to set up your hard disks as RAID disks BEFORE you install any OS. Be Warned this is not an exercise for the fain of heart. Here are the instructions I use (unfortunately I cannot remember the original source): Software RAID Redundant Array of Independent Disks "RAID" is a method of using multiple disks to provide different balances of ...


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By trial and error, the following seems to partially work: Prepend a # to /etc/default/grub.d/dmraid2mdadm.cfg as suggested on ubuntu-devel and bug 1318351 sudo mdadm --assemble --scan sudo update-initramfs -u -k all sudo dpkg-reconfigure mdadm (I'm not sure if step 1 is necessary; I'm also not sure if step 3 is necessary, as step 4 seems to do this ...


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I found the cause. EXT4 is populating inode list since it is a freshly created filesystem which causes the rebuild speed to drop.


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Sure thing! Use pvdisplay to check for the creation of a new physical volume group. If the RAID is part of a pv group, create a logical volume group using lvcreate -L (size) -n (name) Format and mount the partition as usual


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Software RAID: Don't do it! I've never ever in my entire career seen a software RAID actually gracefully recover from damaged hardware, whereas I've seen tons of software RAIDs crap out create problems when there were no hardware problems at all... Back-up: RAID is a protection against a single disk failure (or dual disk failure in case of RAID-6)! It ...


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To backup i'd suggest to use tar, so that your backup can reside in a single file and possibly be compressed: tar cf /<path_to_backup_partition>/backup.tar directory1 file1 ... But this would just save the directories and the files chosen to a tar archive and in short it would be useful only if planning to reinstall everything. The easiest solution ...


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If the spare drive is larger than the (supposedly) failing, than you can simply copy the entire disk by using the dd command: dd if=/dev/sda of=/dev/sdb bs=1M (Of course replace the device file names according to your configuration.) None of these disks should be mounted, so use an Ubuntu LiveCD for running dd. If the disk is indeed failing than you ...


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You can do this in 2 ways. Either back up Ubuntu manually or mirroring your 2 drives using a RAID 1 configuration. Back up Ubuntu This is probably the easiest method. You can use deja dup or a similar tool to back up either individual folders or your whole system to your other drive. There is a guide on using deja dup here. Set up drive mirroring using ...


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6*2TB RAID5 will give you between 8TB data and 4 TB parity and 10GB data and 2GB parity The former gives you dual disk failure protection whereas the latter is discouraged as it gives you single disk failure protection without any further redundancy. Also, depending on the UI, you will see the real usage (including parity) or the fake usage (excluding ...


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I've found the problem. I read that GRUB can be placed inside the LVM and that it is somehow possible, however with the lack of proper documentation I DO NOT recommend trying this. That is what caused the problem, placing GRUB inside LVM volume on RAIeD-5. To fix this, all you need to do is write GRUB to the regular HD's, outside of the RAID partitions. ...


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Ubuntu can't boot from a software raid in my experience. You need to create a non-raid partition to install GRUB to. Format the partition as fat32 and set boot flag.


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There are a number of virtual filesystem that can merge two real locations into one. You have to mount each separately but you can then combine those mountpoints into one. One problem is determining where new files are written so for simplicity, the one I use is readonly (and I write to the direct mounts). This will work for you. This is what I'd have in ...


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There are three more things you can do: Check the SCSI terminator and replace that. (hardware, to be taken up with your vendor) Check the device(s) with badblocks in another enclosure Use commercial software (the only non-free software I still possess) to check (and maybe repair) your disk. But before we go there, I'd like you to check the two previous ...


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Okay in comments you said you want a fresh install and there is nothing to backup. Basically you just want to download 14.04 and burn to disk or put img on usb (if have access to Windows you can use Linux Live USB Creator). During install process I'm pretty sure one of the options is to wipe everything and do a clean install. Not sure what effect that will ...


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I'm hoping to do this nondestructively, as it would take considerable time to migrate the data off and then migrate it back once the array has been built. I'm not sure what you mean. You have to migrate the data from your plain disk to your new array in any case. As one of the answers already suggested, you can create a RAID10 array with two missing ...



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