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With all the words of LVM2 going on, I feel it is only appropriate to also mention the risk. |
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On a desktop I had installed LVM2 considering that I did need to upgrade partitions every now and then and my previous solution was add another drive/partition and cross mount - e.g. like done with /usr/local under /usr, which worked fairly well. LVM2 worked great - until one of the drives crashed and I was trying to figure out what was on it. From that pov, volume management is a pain. I did figure out what I had mounted to it - but only after deconstructing the LVM configuration file to match it up with what I had put there. (And no, I had not yet gotten to doing an LVM soft-RAID solution to map a single LVM partition to two drives, which would certainly have helped.) I got my system working by adding a new drive that was not part of the volume group, and removing the old drives from the volume group. Fortunately, I had my volume setup so that they one partition was not made up of non-overlaping partitions on different drives. (e.g. partition A = |
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sda1 + sda2 instead of sda1 + sdb1.) |
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So, unless you are looking to use LVM in a soft-RAID solution between multiple physical drives, not multiple partitions on the same drive, (e.g. partition A = sda1 + sda2, with mirror on sdb1+sdb2), then I would not suggest it as should anything happen, it'll make data recovery that much harder. |
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Just 2 cents for the pot. |
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Ben |
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----- Original Message ---- |
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From: Neil Bothwick <neil@××××××××××.uk> |
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To: gentoo-user@l.g.o |
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Sent: Saturday, March 21, 2009 4:57:55 PM |
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Subject: Re: [gentoo-user] extending /usr partition... |
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On Sat, 21 Mar 2009 19:39:08 +0100, Jarry wrote: |
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> I remember having lvm2 a few years ago, and despite of that I could not |
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> extend any partition, which was being used. What is then lvm2 good for, |
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> if I can not extend partitions on-the-fly? I can not unmount /usr before |
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> extending... |
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You can extend partitions on the fly with LVM2, and have always been able |
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to, provided you have free space in its volume group. Was it the partition |
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you had trouble resizing or the filesystem? That's a separate step and is |
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dependent on the tools available for the particular filesystem on use. It |
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is certainly possible to extend a mounted ext3 filesystem now, but that |
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may not have always been the case. |
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-- |
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Neil Bothwick |
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Can vegetarians eat animal crackers? |