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Thread: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

  1. #11
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    RAID 0 should be seeing the two SSDs (240 GB each) as a single drive (of 480 GB) which gdisk seems to show, as the sizes of the partitions of that drive add up correctly. So, assuming we can think of the RAID array as a single drive as it's supposed to be (I don't know why it shows that 223GiB number), I'm wondering how I can repair the boot processes of that drive.







  2. #12
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    I do not know how you mount & assemble a RAID, but gdisk may be just looking at each drive not at the RAID when it is working?
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  3. #13
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    That's possible, but there are a few things that make me think it is correctly interpreting the RAID, and I just have to fix the partitions. First, the partitions that I and windows have made in the past were to the RAID array, not to the individual disks, so I would think that, if gdisk was only able to see the two disks separately, there shouldn't be any partitions on them, there should just be two disks of exactly the same size. I don't know the details of how partition tables, file systems, etc., are distributed among the drives in a RAID array, but I would think it would be completely uninterpretable if something was only looking at the single drives, and would just appear unallocated. But I can't be sure.

    If we go under the assumption that I am indeed looking at partitions on the array, can oldfred, or anyone else listening, offer advice as to how to use something like boot-repair to fix the partitions? There are a bunch of options in there and I certainly haven't exhausted them in my attempts so far. But I think I've already tried everything on the ubuntu UEFI page, to no avail.

    I might also try another format and reinstall of ubuntu, and track all the options I choose carefully. To recap, however, I currently can't boot even into the liveUSB under the UEFI modes, only legacy.

  4. #14
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    I just found this, linked by oldfred, in a previous post; looks remarkably similar to my situation, and I am coming to accept that, one way or another, I'm going to have to start over :\

    Would this be recommended?

    http://sygard.no/2012/09/efi-dualboo...n-sony-vaio-s/

  5. #15
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    Hope someone else can help that knows RAID a bit more than I do.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  6. #16
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    A small update and complication...when I have it set to boot in legacy mode, it gives me an option to go into Intel's RAID configuration utility. I noticed that, usually, the array is "failed" and not bootable, and only one of the two physical ssd's appears. But sometimes, it labels the array as bootable and the status is normal and both ssd's are there. You were right that the 223 GiB number was the size of one of the physical drives; the boot during which I reported the gdisk output was one in which only one physical drive was recognized, so the array was completely broken. Also during that boot, Gparted showed that single drive as entirely unallocated...I guess I could have put two and two together. So it seems the partition table is stored on both (all) volumes in RAID, and that's what gdisk was trying to make sense of. This could explain quite a bit... (also, sometimes both ssd's will show up but only one will be a "member" so the array is still broken, and all I'm doing is here is restarting, eek)

    I'm going to be depressed if this is a hardware issue, it will be the second time I RMA the machine. I just wonder why windows was working fine for a couple days (i.e. the RAID was working fine) and then I go and install ubuntu and all this stuff starts happening.

    Is there anything that could be causing this other than hardware? Advice...?

  7. #17
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    I thought the advantage of RAID 0 was speed at the expense of reliability. If one drive fails both all data is lost as it is partiality on one and partially on the other.

    But that was done more with hard drives as they were slower. Many that had to compile large applications or other drive intensive type applications changed to use SSDs as they were faster. But not necessarily SSD in RAID 0.
    Is system that much faster?

    I find with my slow SSD on an older system is pretty fast. And what I have seen is that new SSD are twice as fast as mine.

    https://wiki.archlinux.org/index.php/SSD_Benchmarking
    http://www.unix.com/unix-dummies-que...hed-reads.html
    SSD speed -T is cache, -t is device
    fred@fred-Precise:~$ sudo hdparm -t /dev/sdd4
    /dev/sdd4:
    Timing buffered disk reads: 626 MB in 3.01 seconds = 208.20 MB/sec
    Older 160GB rotating drive:
    /dev/sdb4:
    Timing buffered disk reads: 212 MB in 3.01 seconds = 70.46 MB/sec
    USB2 flash drive
    /dev/sde1:
    Timing buffered disk reads: 50 MB in 3.07 seconds = 16.26 MB/sec

    Or would breaking the RAID 0 and having Windows on one drive and Ubuntu on the other drive make more sense. Only you can decide.

    Many other threads that oldfred was posting in. I am sure there are many more.
    I used this in google and changed date to just last year's search.
    oldfred RAID 0 site:ubuntuforums.org
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  8. #18
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    Quite right about RAID 0. There have been side-by-side comparisons of single drives and RAID 0 arrays of comparable size, and the RAID arrays are indeed about twice as fast. But you're right that it's still probably pointless, and the point that's usually made is that ssd's are already fast enough for most purposes; the only serious advantage you'd have would be if you spend the whole day transferring 500 mb files between ssd RAID 0 arrays...not exactly my situation.

    Benchmarking study:
    http://www.tomshardware.com/reviews/ssd-raid-benchmark,3485-3.html

    This might not, after all, be a hardware issue. Apologies for being hasty. Let me do a quick summary of this thread so far, and then a major update.


    When I got the computer back from repairs, ubuntu wasn't booting, so I reinstalled it (at this point I have two main partitions, one for windows, one for ubuntu, on a RAID 0 array of ssd's). After the first restart, nothing booted and it went straight to the bios. There were no bootable hard drives/partitions listed in there. I tried many things to see if I could repair the boot sectors that got messed up, but I couldn't salvage either the windows or the ubuntu installs. And, I couldn't even boot bootable burned iso's off of a usb stick unless the boot mode in the bios was set to legacy (although that turned out to be another issue...).


    When you boot in legacy mode, it also shows you the status of the connected hard drives and RAID arrays. Here I started to notice that the RAID array was usually broken and one ssd was completely missing. Sometimes however both would show up. This is the main thing that led me to conclude that it must be a faulty drive; it really seemed like a hardware issue. I was also thinking it might be a faulty bus or something on the new motherboard. As a last step, I completely deleted the RAID array, and the second drive was still not showing up.


    But then I switched the physical locations of the two drives, and the second drive re-appeared, along with the broken RAID array. I deleted the array again, restarted, and both drives remained. Then I switched the physical locations back to their original configuration, and both drives still remained. So...the ubuntu install, along with the attempts at repairs I made afterwards, must have permanently messed up the RAID array (I didn't know that was possible). I decided against trying RAID again and just attempted to reinstall the operating systems on the two separate drives (like oldfred suggested).


    This was initially still failing because I had put the bios back in UEFI mode. What I found out was that even the bootable usb stick, along with the hard drives, needed to be configured with a GPT partition table if you're using UEFI mode. I should have already known that...but I didn't even know what a partition table or partitioning scheme was until now. I was using Rufus 1.4.6 to burn the installation iso's for both operating systems, and it actually has an option for what kind of partition table to use; I had been using MBR. Long story short(er), once I made those bootable usb's with GPT, I installed both operating systems completely successfully.

    For the purposes of this thread, I think we can consider this "solved". However, GRUB isn't working, and I have to switch between the drives in the bios to "dual-boot". If anyone has any ideas about that, I'd be interested, but I'll do some better research if I decide I care enough to make another thread about it. I'm just glad to be booting into ubuntu again...

    Thanks for the help oldfred!




  9. #19
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    If still 12.04 run a BootInfo report.

    Post the link to the Create BootInfo report. Is part of Boot-Repair:
    https://help.ubuntu.com/community/Boot-Info

    With 14.04 there is not yet a ppa for trusty to install Boot-Repair.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  10. #20
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    Re: Ubuntu 12.04 LTS cannot boot under UEFI; Windows 8 disappeared too

    Yes I'm still using 12.04 LTS. The boot-repair-disk didn't boot for some reason, so I just used the installation liveUSB, did "try", and installed boot-repair. Here's the output:

    http://paste.ubuntu.com/7290068/

    Thanks, look forward to thoughts.

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