Hello,
Today a virtual server under my administration ran out of disk space, so
I had to get extra space to it.. while it was running, because it's an
important web server without any kind of HA/Load Balancing (don't do
that, kids).
So what happened, is that after another administrator had extended the
disk from VMWare, I tried to extend it from the OS side.
Everything went well, listing my steps here:
* echo 1 > /sys/class/scsi_device/2\:0\:0\:0/device/rescan
* fdisk /dev/sdb (the usual, delete partition and make a new, bigger one)
Now's when the problems happened. After writing the partition table I
got the usual "Busy" error. But I needed to do this without downtime.
So, what did I try to get the kernel acknowledge the partition size change:
* hdparm -z /dev/sdb
* partx -a -v /dev/sdb
* partprobe -s
* echo "1" > /sys/block/sdb/device/rescan
And while dmesg reported that it recognized the partition change, LVM
did still not see it. So eventually, I was still forced to reboot, after
which everything (pvresize, lvresize, resize2fs) worked fine. Environment:
* A VMWare virtual machine
* CentOS 6.7 (Final)
Is there any other way I'm missing? Is this caused by the fact that I
was trying to resize a partition that is under the root file system? If
so, then is it really impossible to do it live?
Thanks,
--
Sander Kuusemets
University of Tartu, High Performance Computing, IT Specialist
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