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48 lines
1.6 KiB
Markdown
48 lines
1.6 KiB
Markdown
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---
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title: Resize partition
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layout: default
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created: 2013-12-16 14:16:31 +0100
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updated: 2014-02-10 09:09:32 +0100
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toc: false
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tags:
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- know-how
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- software
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- linux
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---
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Detect new disk size
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====================
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With virtual machines (VMware at least), you can resize the disk drives without restarting the VM itself. After doing
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that, you have to get Linux to recognize the new disk drive size. Use one of these (found [here](http://oldblog.renanmarks.net/en/blog/reload-partition-table-without-rebooting-linux-system)
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and [here](http://jason-antonacci.blogspot.de/2012/08/recognizing-linux-block-device.html)) - assuming the modified
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drive is `/dev/sdc`:
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* `hdparm -z /dev/sdc`
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* `echo 1 > /sys/block/sdc/device/rescan`
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* `partprobe /dev/sdc`
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<p><div class="notewarning">
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Make sure to umount all mounts from this drive before rescanning it. Otherwise, it won't work.
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</div></p>
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Check the success with `fdisk -l`.
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Resize partition
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================
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Using `parted`, there's the `resize` command. But this is not as robust, es using `resize2fs` from the [e2fsprogs](apt://e2fsprogs)
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package. So the recommended way is to manually resize the partition using `parted` and then run `resize2fs` to do the
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actual resize operation.
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Make sure to switch to `unit s` (sectors) in `parted` and `print` the partition table before doing anything to it so
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that you can refer to it later.
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Fill Empty Space
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================
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To fill empty space with zeroes (to e.g. reduce the partition size using `vmkfstools`), use this command (found [here](http://www.zedt.eu/tech/linux/zero-out-free-disk-space/)):
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nice cat /dev/zero > zero.fill; sync; sleep 1; sync; rm -f zero.fill
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