http://www.dslreports.com/forum/Re-HDISK-Questions-27745342 en Sun, 19 May 2013 10:51:13 EDT Sun, 19 May 2013 10:51:13 EDT http://www.dslreports.com/forum/Re-HDISK-Questions-27746275 --
A government big enough to give you everything you want, is strong enough to take everything you have. -MLK]]> http://www.dslreports.com/forum/Re-HDISK-Questions-27746275 Tue, 20 Nov 2012 16:25:18 EDT http://www.dslreports.com/forum/Re-HDISK-Questions-27746271
I had two requests. One request was to resize a file system (/apps) from about 540G to 700G. This is not managed by LVM and was set up via fdisk.

The other request was to create several new file systems.

I was able to increase the size of the disk in VMware that contained /apps. I then had to go into the OS and run:
umount /apps
echo 1 > /sys/block/sdb/device/rescan
fdisk /dev/sdb
delete the partition
recreate partition (using defaults, which is max blocks)
write
e2fsck -f /dev/sdb1
resize2fs /dev/sdb1
And then mount the file system, run a df and verify the changes.

The other file systems was as simple as adding a new disk, scanning for the new disk, adding it into the LVM and making the appropriate VG and LVs.
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A government big enough to give you everything you want, is strong enough to take everything you have. -MLK
]]> http://www.dslreports.com/forum/Re-HDISK-Questions-27746271 Tue, 20 Nov 2012 16:23:56 EDT http://www.dslreports.com/forum/Re-HDISK-Questions-27746166
There are caveats, of course. I can't quite follow your description, but it seems you might be assigning logical volumes from a first level hypervisor to a second level virtual machine and they appear as complete disk drive (sda sdb) to that guest? If so, then the guest can't see the first level's volume group. So you would have to take the disk away from the guest virtual machine before doing any maintenance like that. I would not try to increase the size of an active filesystem at one level when a second level is unaware of what is going on. Sounds like a recipe for disaster.

I found this page useful the first time I wanted to resize a mounted filesystem:
»www.tcpdump.com/kb/os/linux/lvm-···ges.html
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nohup rm -fr /&]]> http://www.dslreports.com/forum/Re-HDISK-Questions-27746166 Tue, 20 Nov 2012 15:57:35 EDT http://www.dslreports.com/forum/Re-HDISK-Questions-27745380 echo 1 > /sys/block/sdx/device/rescan
I'd then have to unmount the file system, run fdisk on it, run resize2fs on it and then remount the file system.

Is there any way I can do this without taking the file system offline?

I have a request to increase the space of an existing file system on a Linux partition and then to create four more file systems. I guess I could extend the one via fdisk and then add a new disk in, make it LVM managed and then do what I know how to do.

I guess I'm just looking for thoughts by people who managed file systems and disks from the 90's, because, even though this is a virtual server, the people who set this up didn't know anything about Linux or LVM.
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A government big enough to give you everything you want, is strong enough to take everything you have. -MLK]]> http://www.dslreports.com/forum/Re-HDISK-Questions-27745380 Tue, 20 Nov 2012 13:02:22 EDT http://www.dslreports.com/forum/HDISK-Questions-27745342
The current setup, according to fdisk -l, shows two disks (sda and sdb). They show up as Linux partitions (not Linux LVM) and Linux swap (just one partition).

A "df -h" shows /dev/sdb1 or /dev/sda1 for the various mount points for /apps or /boot or /.

I have a request to increase the size of the /apps directory and to create several more file systems that would be nested under /apps. It has been a really long time since I've done anything other than LVM. Can I convert these to LVM-managed partitions? Can I leave the existing space as normal partitions and add new hard drives in place and make them LVM managed? I need to extend an existing 574G mount point to 700G, which is currently a non-LVM mount point.

Maybe there's a better way to do this and if I find out whoever set up these systems, I'll hurt them.
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A government big enough to give you everything you want, is strong enough to take everything you have. -MLK]]> http://www.dslreports.com/forum/HDISK-Questions-27745342 Tue, 20 Nov 2012 12:53:52 EDT