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