On Tuesday 13 March 2012 22:52:01 Bonno Bloksma wrote: > > Using the 6.0.4 amd netinst CD I created a small 10GB virtual machine (VM). > I then realized I needed it to be a bit bigger so I wanted to extend the > LVM environment and add that space to the /var logical volume. Of course > as this is a new VM I just could have started from scratch but I am trying > to learn something as well. ;-) > > First I had a look at the current disk layout using fdisk -l > > root@wwwgw:~# fdisk -l > > Disk /dev/sda: 10.7 GB, 10737418240 bytes > 255 heads, 63 sectors/track, 1305 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x000d6e97 > > Device Boot Start End Blocks Id System > /dev/sda1 1 37 291840 83 Linux > Partition 1 does not end on cylinder boundary. > /dev/sda2 37 1306 10190849 5 Extended > /dev/sda5 37 1306 10190848 8e Linux LVM > > 1) > Why the warning about the 300MB /boot partition not ending on a cylinder > boundary? I used the manual setup in the Debian 6.0.4 installation and > told it to create a 300MB partition at the beginning of the disk. Did the > installation software do something wrong or should I have know something I > do not know yet? Older versions of fdisk by default aligns to cylinder. This is deprecated and not the case now. Simply suppress this warning by using -cu > > 2) > After that came a lot of warnings about /dev/dm-0, /dev/dm-1, /dev/dm-2, > /dev/dm-3 and /dev/dm-4. I know those are LVM2 devices but... Why is fdisk > (still) seeing them as disks/partitions it has to show during a listing, > and then complain they are not valid? > I think this is a bug in fdisk. > > At the VMware level I increased the disk from 10GB to 12GB. Using cfdisk, > which in my opinion gives less cause for a user error, I created a new > logical sda6 partition in the free space. The end result is: root@wwwgw:~# > fdisk -l > > Disk /dev/sda: 12.9 GB, 12884901888 bytes > 255 heads, 63 sectors/track, 1566 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > Sector size (logical/physical): 512 bytes / 512 bytes > I/O size (minimum/optimal): 512 bytes / 512 bytes > Disk identifier: 0x000d6e97 > > Device Boot Start End Blocks Id System > /dev/sda1 1 37 291840 83 Linux > Partition 1 does not end on cylinder boundary. > /dev/sda2 37 1566 12285008 5 Extended > /dev/sda5 37 1306 10190848 8e Linux LVM > /dev/sda6 1306 1566 2094127+ 8e Linux > > 3) > Why is there a + at the end of the number of blocks? In fdisk, a block is 1024 bytes. The partition does not contain integral number of blocks, hence the + sign. > > I then want to make the sda6 partition a LVM physical volume using > root@wwwgw:~# pvcreate /dev/sda6 > Device /dev/sda6 not found (or ignored by filtering). > root@wwwgw:~# > indeed, there is no /dev/sda6 yet. > > 4) > Why is /dev/sda6 not there yet? What step am I missing? You should run partprobe(8) or reboot your machine. > > > Ok, after a reboot (it is not a production server yet) the /dev/sda6 is > there. Form here on it was (almost) straight sailing. ;-) > > root@wwwgw:~# pvcreate /dev/sda6 > Physical volume "/dev/sda6" successfully created > root@wwwgw:~# vgextend vgroup1 /dev/sda6 > Volume group "vgroup1" successfully extended > > Then to runlevel 1 to make sure (almost) nothing is using the /var > directory tree and > root@wwwgw:~# lvextend -l+2G /dev/vgroup1/lvvar > Extending logical volume lvvar to 3.86GiB > Logical volume lvvar successfully resized > > root@wwwgw:~# umount /var > Then first a filesystem check as that seems to be needed before resizing. > Not doing so will give me a warning although this was not mentioned in the > HOWTOs I have read. root@wwwgw:~# fsck -f /dev/vgroup1/lvvar > root@wwwgw:~# resize2fs /dev/vgroup1/lvvar > root@wwwgw:~# mount /var > > and back to runlevel 2 > > > Anything else I missed? > > Bonno Bloksma
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