[CentOS] Extending a CentOS disk without reboot
Sander Kuusemets
sander.kuusemets at ut.eeMon Dec 21 19:15:08 UTC 2015
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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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