On 4 February 2013 20:27, Mathias Burén <mathias.buren@xxxxxxxxx> wrote: > Hi list, > > I've an Intel Atom 330 running 32-bit Ubuntu, ~3.5GB RAM. The intent > is to store large media files (>4GB) for streaming by maximum 3 > clients at any time. Very read heavy. > 6x 2TB HDDs are available, the crux is that 3 HDDs are on the on-board > SATA controller, the other 3 are on a Marvel PCI-E adapter > > cat /proc/mdstat > > Personalities : [raid10] > md125 : active raid10 sdg[1] sdf[0] > 1953382400 blocks super 1.2 512K chunks 2 far-copies [2/2] [UU] > [>....................] resync = 1.1% (22074880/1953382400) > finish=642.2min speed=50114K/sec > > md126 : active raid10 sde[1] sdd[0] > 1953382400 blocks super 1.2 512K chunks 2 far-copies [2/2] [UU] > [>....................] resync = 1.6% (31473408/1953382400) > finish=398.6min speed=80354K/sec > > md127 : active raid10 sdc[1] sdb[0] > 1953382400 blocks super 1.2 512K chunks 2 far-copies [2/2] [UU] > [>....................] resync = 1.1% (22630912/1953382400) > finish=617.9min speed=52073K/sec > > unused devices: <none> > > create commands: > 105 sudo mdadm --verbose --create md0 --level=10 --layout=f2 > --raid-devices=2 /dev/sdb /dev/sdc > 106 sudo mdadm --verbose --create md1 --level=10 --layout=f2 > --raid-devices=2 /dev/sdd /dev/sde > 107 sudo mdadm --verbose --create md2 --level=10 --layout=f2 > --raid-devices=2 /dev/sdf /dev/sdg > 111 sudo mdadm --verbose --create md3 --level=10 --layout=f2 > --raid-devices=3 /dev/md/md0 /dev/md/md1 /dev/md/md2 > 118 sudo mdadm --stop /dev/md124 # to stop seek of death until the > above finishes resyncing > > I read that the far layout gives faster read performance compared to > standard RAID1 in a 2 HDD array, so that's why I used it. I then > created yet another RAID10 f2 layout of the 3x 2 disk RAID10 volumes, > giving me /dev/md124. Filesystem doesn't matter, I need something > that's stable with good performance over the RAID set. > I just realized that out of 12 TB raw space I now only have 3TB > available, heh. So I suppose I'm going for a different layout. > > Any opinions? > > Cheers, > Mathias I obviously meant to create a RAID0, not a RAID10, over the 3 RAID10 devices. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
