I am trying to figure out the offest sector for vm01.img2 partition. I tried
many possible ways, for example (1020 *512) , but in vain. I just can''t
hit the right offest sector to mount vm01.img2 partition. Any help is greatly
appreciated.
BTW, I am using xen-3.0.3-135.el5_8.2. The vm01.img file was created using
virt-install command. The command I am using to mount the partition in that img
file is: mount -o loop,offset=130048 -t ext3 /vm/vm01.img /mnt/xenimg
#fdisk -l /vm/vm01.img
vice Boot Start End Blocks Id System
/vm/vm01.img1 * 1 64 514048+ 83 Linux
/vm/vm01.img2 65 1020 7679070 83 Linux
/vm/vm01.img3 1021 1657 5116702+ 83 Linux
Partition 3 has different physical/logical endings:
phys=(1023, 254, 63) logical=(1656, 254, 63)
/vm/vm01.img4 1658 3916 18145417+ 5 Extended
Partition 4 has different physical/logical beginnings (non-Linux?):
phys=(1023, 254, 63) logical=(1657, 0, 1)
Partition 4 has different physical/logical endings:
phys=(1023, 254, 63) logical=(3915, 254, 63)
/vm/vm01.img5 1658 1784 1020096 83 Linux
/vm/vm01.img6 1785 1848 514048+ 82 Linux swap / Solaris
/vm/vm01.img7 1849 3916 16611178+ 83 Linux
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Try the following if you haven''t already - file -s /vm/vm01.img see if that gives you your startsector. I''m doing this from my phone so forgive misspellings and no formatting On Sat, Apr 14, 2012 at 2:15 PM, Scott Meyers <scottmeyers@live.com> wrote:> I am trying to figure out the offest sector for vm01.img2 partition. I tried > many possible ways, for example (1020 *512) , but in vain. I just can''t hit > the right offest sector to mount vm01.img2 partition. Any help is greatly > appreciated. > > BTW, I am using xen-3.0.3-135.el5_8.2. The vm01.img file was created using > virt-install command. The command I am using to mount the partition in that > img file is: mount -o loop,offset=130048 -t ext3 /vm/vm01.img /mnt/xenimg > > #fdisk -l /vm/vm01.img > vice Boot Start End Blocks Id System > /vm/vm01.img1 * 1 64 514048+ 83 Linux > /vm/vm01.img2 65 1020 7679070 83 Linux > /vm/vm01.img3 1021 1657 5116702+ 83 Linux > > Partition 3 has different physical/logical endings: > phys=(1023, 254, 63) logical=(1656, 254, 63) > /vm/vm01.img4 1658 3916 18145417+ 5 Extended > > Partition 4 has different physical/logical beginnings (non-Linux?): > phys=(1023, 254, 63) logical=(1657, 0, 1) > > Partition 4 has different physical/logical endings: > phys=(1023, 254, 63) logical=(3915, 254, 63) > /vm/vm01.img5 1658 1784 1020096 83 Linux > /vm/vm01.img6 1785 1848 514048+ 82 Linux swap / > Solaris > /vm/vm01.img7 1849 3916 16611178+ 83 Linux > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xen.org > http://lists.xen.org/xen-users
On Sat, 2012-04-14 at 19:15 +0100, Scott Meyers wrote:> I am trying to figure out the offest sector for vm01.img2 partition. I > tried many possible ways, for example (1020 *512) , but in vain. I > just can''t hit the right offest sector to mount vm01.img2 partition. > Any help is greatly appreciated.There is a tool called "kpartx" which is very useful here -- it will read the partition table and create DM nodes corresponding to the partitions on it. You might need to "losetup" the img to get a /dev/loop and then run kpartx on that (I don''t recall if kpartx handles loop mounting too) kpartx ought to be available on most distros, on Debian it is its own binary package but the source is "multipath-tools" so YMMV may vary on other distros. Xen also ships "lomount" which automates the calculation of offset to mount, but strangely I''ve never really used it. Ian.
On 14 April 2012 20:15, Scott Meyers <scottmeyers@live.com> wrote:> I am trying to figure out the offest sector for vm01.img2 partition. I tried > many possible ways, for example (1020 *512) , but in vain.Hi, you should do 65*512 if you want to mount at the beginning of partition 2, not 1020x512. I''ve already answered you for this question. Please read this: http://xen.1045712.n5.nabble.com/Viewing-the-content-of-img-file-td4840212.html Haven''t you tried what I suggested in such old discussion? Please try that method because this always works for me. I can''t figure out why it shouldn''t work for you. Cheers, -- Flavio
Instead of figuring out the offset and mounting that way, why not use kpartx to
figure out where all of the partitions are.
You would run:
losetup -f to determine an available loop device
losetup /dev/loopX <path to image> to do the loop setup where X is the
loop device number
kpartx -a /dev/loopX to read the partition table and create entries in
/dev/mapper
mount /dev/mapper/loopXpY where Y is the partition number
If you really want to get the proper offset and are running in Python do
Import parted
pdev = parted.device.Device(<path to image>)
pdisk = parted.disk.Disk(pdev)
offset = pdisk.partitions[<partition num> - 1].geometry.start *
pdisk.device.sectorSize # Need to multiply by the sectorSize as parted gives the
offset in sectors not bytes.
If you are doing this from bash run:
parted <path to image> -s unit b print | grep "^\s*<partition
number>" | awk ''{print $2 }'' | tr -d
''B''
This prints out the partition table with all the units in bytes, then selects
the line with the proper partition number, selects the starting offset entry and
removes the trailing B from the number. This will leave you with just the byte
offset which you can then give to the mount command to mount the partition.
Matt Keeler
From: xen-users-bounces@lists.xen.org [mailto:xen-users-bounces@lists.xen.org]
On Behalf Of Scott Meyers
Sent: Saturday, April 14, 2012 2:15 PM
To: Xen Users List
Subject: [Xen-users] Mounting *.img file
I am trying to figure out the offest sector for vm01.img2 partition. I tried
many possible ways, for example (1020 *512) , but in vain. I just can''t
hit the right offest sector to mount vm01.img2 partition. Any help is greatly
appreciated.
BTW, I am using xen-3.0.3-135.el5_8.2. The vm01.img file was created using
virt-install command. The command I am using to mount the partition in that img
file is: mount -o loop,offset=130048 -t ext3 /vm/vm01.img /mnt/xenimg
#fdisk -l /vm/vm01.img
vice Boot Start End Blocks Id System
/vm/vm01.img1 * 1 64 514048+ 83 Linux
/vm/vm01.img2 65 1020 7679070 83 Linux
/vm/vm01.img3 1021 1657 5116702+ 83 Linux
Partition 3 has different physical/logical endings:
phys=(1023, 254, 63) logical=(1656, 254, 63)
/vm/vm01.img4 1658 3916 18145417+ 5 Extended
Partition 4 has different physical/logical beginnings (non-Linux?):
phys=(1023, 254, 63) logical=(1657, 0, 1)
Partition 4 has different physical/logical endings:
phys=(1023, 254, 63) logical=(3915, 254, 63)
/vm/vm01.img5 1658 1784 1020096 83 Linux
/vm/vm01.img6 1785 1848 514048+ 82 Linux swap / Solaris
/vm/vm01.img7 1849 3916 16611178+ 83 Linux
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Xen-users mailing list
Xen-users@lists.xen.org
http://lists.xen.org/xen-users