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Thread: Grub isoloop

  1. #1
    Join Date
    Jul 2008
    Location
    Ra'anana, Israel
    Beans
    55
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Question GRUB2 iso loop [takes a long time|too slow|hangs]

    Dear Friends,

    A USB Flash is formatted is MBR formatted, one primary partition with FAT32.

    In there, I put the four different Ubuntu CD images:
    Code:
    shahar@shahar-desktop:~$ ls -l /media/SHAHAR_SYST/operating-systems/
    total 2843060
    -rw-r--r-- 1 shahar shahar 733849600 2011-04-26 15:58 ubuntu-11.04-alternate-amd64.iso
    -rw-r--r-- 1 shahar shahar 726740992 2011-05-21 16:27 ubuntu-11.04-alternate-i386.iso
    -rw-r--r-- 1 shahar shahar 732112896 2011-05-03 13:34 ubuntu-11.04-desktop-amd64.iso
    -rw-r--r-- 1 shahar shahar 718583808 2011-05-03 12:43 ubuntu-11.04-desktop-i386.iso
    Theres also GRUB2 installed:

    Code:
    set timeout=10
    set default=0
    
    menuentry "Ubuntu 11.04 Desktop i386 (memtest86+)" {
        set isofile="/operating-systems/ubuntu-11.04-desktop-i386.iso"
    
        loopback loop $isofile
        linux16 (loop)/install/mt86plus
    }
    
    menuentry "Ubuntu 11.04 Desktop i386" {
        set isofile="/operating-systems/ubuntu-11.04-desktop-i386.iso"
    
        loopback loop $isofile 
        linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile quiet splash --
        initrd (loop)/casper/initrd.lz
    }
    
    menuentry "Ubuntu 11.04 Desktop amd64" {
        set isofile="/operating-systems/ubuntu-11.04-desktop-amd64.iso"
    
        loopback loop $isofile 
        linux (loop)/casper/vmlinuz boot=casper iso-scan/filename=$isofile quiet splash --
        initrd (loop)/casperUbuntu 11.04 Alternate amd64
    }
    
    menuentry "Ubuntu 11.04 Alternate i386" {
    	set isofile="/operating-systems/ubuntu-11.04-alternate-i386.iso"
    	set gfxpayload=keep
    	loopback loop $isofile
    	linux	(loop)/install/vmlinuz  iso-scan/filename=$isofile file=/cdrom/preseed/ubuntu.seed quiet --
    	initrd	(loop)/install/initrd.gz
    }
    
    menuentry "Ubuntu 11.04 Alternate amd64" {
            set isofile="/operating-systems/ubuntu-11.04-alternate-amd64.iso"
            set gfxpayload=keep
            loopback loop $isofile
            linux   (loop)/install/vmlinuz  iso-scan/filename=$isofile file=/cdrom/preseed/ubuntu.seed quiet --
            initrd  (loop)/install/initrd.gz
    }
    It kinda sorta works. The problem is that it takes a long time from executing the command list in GRUB2 to actual boot. After I press enter on a menu item, I get a long period of waiting with a black screen (don't remember the little text it has - nothing unsusual) before I get to see the kernel doing it's thing. And some times it even takes too long that I'm not sure whether it will eventually boot.

    During this time, the LED on the USB stick keeps fading in and out. For what its worth, this is a SanDisk Cruzer 8GB.

    I have a feeling that this has to do with the isoloop feature under FAT32 or in general. mainly because this doesn't happen when live system is installed like with unetbootin.

    Booting the memtest86+ entry doesn't give any trouble.

    Anyone experienced this?

    Blessings,
    Thanks,
    Shahar
    Last edited by DawnLight; June 13th, 2011 at 02:47 PM. Reason: was a bad title

  2. #2
    Join Date
    Jul 2011
    Beans
    1

    Cool Re: Grub isoloop

    same problem here, but:
    ubuntu 11.04 x86 cd.iso on usb hdd primary partition 1 size 50GB ntfs
    grub2 loader

    issues:
    - on p4 very slow
    - on amd x64 dual core very slow

    for now: its not a FAT32 issue

  3. #3
    Join Date
    Aug 2007
    Location
    a puddle in Manchester
    Beans
    9,208
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Grub isoloop

    Have you seen this thread?
    http://ubuntuforums.org/showthread.php?t=1518273

    Also, it's possible to boot some iso's direct from the grub menu - see here
    http://ubuntuforums.org/showthread.php?t=1549847
    MacBook Pro 10,1 retina

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