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On Tue, 11 Dec 2012 12:08:12 +0000 |
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Neil Bothwick <neil@××××××××××.uk> wrote: |
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> On Tue, 11 Dec 2012 12:48:13 +0100, J. Roeleveld wrote: |
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> |
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> > > I'm using metadata version 1.2 for the raid0 array and the type is |
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> > > kernel based autodetect. |
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> > |
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> > Ouch, auto-detect does not work with metadata 1.2. |
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> > Please read the man-page section: |
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> > |
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> > Please rebuild the raid-device using v0.90 metadata and try again. |
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> |
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> I don't understand why your using RAID at all. LVM on top of RAID0 |
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> makes no sense to me when you can simply make each device a PV and |
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> add it to the VG. That's more flexible and easier to repair. |
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> |
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> |
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Some folks like to do the striping in RAID, it's more controllable. 1st |
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block on this disk, 2nd block on that disk, 3rd block on first disk |
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again... |
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Pooling LVM PVs into a VG is a huge gigantic basket of stuff where you |
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don't really get to control very much - LVM sticks data wherever it |
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wants to and you do little more than give some gentle hints (which |
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I strongly suspect are mostly ignored) |
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But yes, in the usual case RAID-0 on LVM doesn't make much sense for |
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most folks. |
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Personally, I prefer ZFS. This whole huge list of shit just goes away: |
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disk partitions |
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partition types |
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disk labels |
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worrying about if my block size is right |
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worrying if my boundaries are correct |
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PVs as different from VGs and LVs |
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VGs as different from PVs and LVs |
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LVs as different from PVs and VGs |
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lvextend && growfs to make stuff bigger |
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umount && shrinkfs && lvreduce && growfs && mount to make stuff smaller |
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I can now take a much simpler view of things: |
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"I have these disks, use 'em. When I've figured out the actual quotas |
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and sizes I need, I'll let you know. Meanwhile just get on with it and |
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store my stuff in some reasonable fashion, 'mkay? kthankxbye! I have |
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real work to do." |
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:-) |
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-- |
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Alan McKinnon |
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alan.mckinnon@×××××.com |
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