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On Sat, 21 Jul 2012 14:11:03 -0700, walt wrote: |
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> I have a 500gig disk that is split roughly in half between two volume |
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> groups, each containing four physical volumes, and each vg is formatted |
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> into an ext4 filesystem of roughly 250GB. |
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This doesn't make sense, VGs don't have filesystems, they contain LVs |
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and they have the filesystems. |
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> What I plan to do is merge the two volume groups into one, containing |
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> one big ext4 filesystem, which will contain all of the files currently |
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> on the disk. |
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> |
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> Can this be done without copying one of the existing ext4 filesystems |
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> to a separate drive first, and then copying it back after extending |
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> the remaining vg/filesystem? (One filesystem has 24GB free and the |
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> other has 25GB free.) |
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It can, by moving data from an LV on one VG to an LV on the other, then |
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reducing one LV and VG and increasing the other. But with so little free |
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space, it would take forever, and you'd still end up with a 90%+ full |
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filesytem. |
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If you have a spare drive, I'd add a partition on that to the VG you want |
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to keep, increase the LV size and move everything over. Then remove the |
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VGs from the second disk, add it to the first VG and use pvmove to move |
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everything off the spare disk before removing it from the VG. You can |
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continue to use the system while this runs, so this gives the least |
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downtime with minimal hassle. |
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-- |
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Neil Bothwick |
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Never underestimate the bandwidth of a station wagon full of tapes! |
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