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On Tue, Nov 29, 2011 at 2:23 PM, Florian Philipp <lists@×××××××××××.net> wrote: |
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> Am 29.11.2011 19:39, schrieb Michael Mol: |
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>> On Tue, Nov 29, 2011 at 1:20 PM, Florian Philipp <lists@×××××××××××.net> wrote: |
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>>> Am 29.11.2011 14:44, schrieb Michael Mol: |
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>>>> On Tue, Nov 29, 2011 at 2:07 AM, Florian Philipp <lists@×××××××××××.net> wrote: |
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>>>>> Am 29.11.2011 05:10, schrieb Michael Mol: |
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>>>>>> I've got four 750GB drives in addition to the installed system drive. |
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>>>>>> |
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>>>>>> I'd like to aggregate them and split them into a few volumes. My first |
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>>>>>> inclination would be to raid them and drop lvm on top. I know lvm well |
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>>>>>> enough, but I don't remember md that well. |
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>>>>>> |
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>>>>>> Since I don't recall md well, and this isn't urgent, I figure I can look |
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>>>>>> at the options. |
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>>>>>> |
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> [...] |
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>>>>> What kind of RAID level do you want to use, 10 or 5? You |
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>>>>> can also split it: Use a smaller RAID 10 for performance-critical |
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>>>>> partitions like /usr and the more space-efficient RAID 5 for bulk like |
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>>>>> videos. You can handle this with one LVM volume group consisting of two |
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>>>>> physical volumes. Then you can decide on a per-logical-volume basis |
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>>>>> where it should allocate space and also migrate LVs between the two PVs. |
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>>>> |
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>>>> Since I've got four disks for the pool, I was thinking raid10 with lvm |
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>>>> on top, and a single lvm pv above that. |
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>>>> |
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>>> |
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>>> Yeah, that would also be my recommendation. But if storage efficiency is |
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>>> more relevant, RAID-5 with 4 disks brings you 750GB more usable storage. |
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>>> |
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>>> |
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>> |
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>> It looks like I'll want to try two different configurations. RAID5 and |
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>> RAID10. Not for different storage requirements, but I want to see |
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>> exactly what the performance drop is. |
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>> |
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>> I wish lvm striping supported data redundancy. But, then, I wish btrfs |
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>> was ready... |
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>> |
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> |
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> Just out of curiosity: What happens if you do `lvcreate --mirrors 1 |
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> --stripes 2 ...`? Does it create something similar to a RAID-10 or does |
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> it simply fail? |
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|
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Hm. I don't know. Honestly, I didn't know about that functionality. |
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Perhaps it's time I catch up on the docs again. |
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|
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-- |
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:wq |
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