Looks like each disk has 2 partitions, /dev/sd[ab]1 --> /dev/md0 --> raid1 (1.8TB) /dev/sd[ab]2 --> /dev/md1 --> raid1 (1.8TB) or linear (3.6TB) So, "none" is linear array. Strange, because "none" is usually individual drive, and it usually says "linear" if it is linear. -- William On Thu, Feb 19, 2015 at 04:56:12PM -0500, D. Hugh Redelmeier wrote:
I just bought a LenovoEMC / IOmega IX2-dl NAS box (cheap, of course). It has a pair of WD Green 2T disk drives.
The supplied firmware is Linux, of course. With a pretty face.
/proc/cpuid says "Feroceon 88FR131 rev 1 (v5l)" which I think is an unfortunately old ARM family. It has 256M of RAM. The kernel is "2.6.31.8".
It offers me RAID 1, RAID 0, and "none". I don't think that I want either RAID and I'm not sure what "none" is.
I don't want RAID 1 because It doesn't give me much reliability improvement for the price (halving the space) and it doesn't give me any speed improvement.
I don't want RAID 0 since it gives me less reliability than no RAID.
I want two different filesystems so that when one goes south, the other isn't lost.
Any advice on how to lightly prod this system to do what I want?
Here's some configuration information.
/etc/fstab doesn't mention the hard drives
First, here's how it looks with the RAID1 setup.
lsblk(8) says. (This command is new to me. I think that I like it):
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT loop0 7:0 0 680.4M 1 loop /mnt/apps loop1 7:1 0 8M 0 loop /mnt/etc loop2 7:2 0 100K 0 loop /oem sda 8:0 0 1.8T 0 disk ??sda1 8:1 0 20G 0 part ? ??md0 9:0 0 20G 0 raid1 ? ??md0_vg-BFDlv (dm-0) 253:0 0 4G 0 lvm /boot ? ??md0_vg-vol1 (dm-1) 253:1 0 16G 0 lvm /mnt/system ??sda2 8:2 0 1.8T 0 part ??md1 9:1 0 1.8T 0 raid1 ??6366c931_vg-lv163c50af (dm-2) 253:2 0 1.8T 0 lvm /mnt/pools/A/A0 sdb 8:16 0 1.8T 0 disk ??sdb1 8:17 0 20G 0 part ? ??md0 9:0 0 20G 0 raid1 ? ??md0_vg-BFDlv (dm-0) 253:0 0 4G 0 lvm /boot ? ??md0_vg-vol1 (dm-1) 253:1 0 16G 0 lvm /mnt/system ??sdb2 8:18 0 1.8T 0 part ??md1 9:1 0 1.8T 0 raid1 ??6366c931_vg-lv163c50af (dm-2) 253:2 0 1.8T 0 lvm /mnt/pools/A/A0 mtdblock0 31:0 0 504K 0 disk mtdblock1 31:1 0 4K 0 disk mtdblock2 31:2 0 4K 0 disk
df(1) says:
Filesystem 1K-blocks Used Available Use% Mounted on rootfs 51200 4216 46984 9% / /dev/root.old 11339 3185 8154 29% /initrd none 51200 4216 46984 9% / /dev/md0_vg/BFDlv 4128448 714776 3203960 19% /boot /dev/loop0 691776 619873 71903 90% /mnt/apps /dev/loop1 7657 1010 6238 14% /mnt/etc none 7657 1010 6238 14% /etc /dev/loop2 128 128 0 100% /oem tmpfs 24776 80 24696 1% /run tmpfs 5120 4 5116 1% /run/lock tmpfs 49540 0 49540 0% /run/shm /dev/mapper/md0_vg-vol1 16493480 975280 15350636 6% /mnt/system /dev/mapper/6366c931_vg-lv163c50af 1902053516 202188 1901851328 1% /mnt/pools/A/A0 /dev/mapper/6366c931_vg-lv163c50af 1902053516 202188 1901851328 1% /nfs/Backups /dev/mapper/6366c931_vg-lv163c50af 1902053516 202188 1901851328 1% /nfs/Documents /dev/mapper/6366c931_vg-lv163c50af 1902053516 202188 1901851328 1% /nfs/Movies /dev/mapper/6366c931_vg-lv163c50af 1902053516 202188 1901851328 1% /nfs/Music /dev/mapper/6366c931_vg-lv163c50af 1902053516 202188 1901851328 1% /nfs/SharedMedia /dev/mapper/6366c931_vg-lv163c50af 1902053516 202188 1901851328 1% /nfs/Pictures
After I switched from RAID1 to "none":
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT loop0 7:0 0 680.4M 1 loop /mnt/apps loop1 7:1 0 8M 0 loop /mnt/etc loop2 7:2 0 100K 0 loop /oem sda 8:0 0 1.8T 0 disk ??sda1 8:1 0 20G 0 part ? ??md0 9:0 0 20G 0 raid1 ? ??md0_vg-BFDlv (dm-0) 253:0 0 4G 0 lvm /boot ? ??md0_vg-vol1 (dm-1) 253:1 0 16G 0 lvm /mnt/system ??sda2 8:2 0 1.8T 0 part ??md1 9:1 0 3.6T 0 linear ??529a853a_vg-lv1ac0e3be (dm-2) 253:2 0 3.6T 0 lvm /mnt/pools/A/A0 sdb 8:16 0 1.8T 0 disk ??sdb2 8:18 0 1.8T 0 part ? ??md1 9:1 0 3.6T 0 linear ? ??529a853a_vg-lv1ac0e3be (dm-2) 253:2 0 3.6T 0 lvm /mnt/pools/A/A0 ??sdb1 8:17 0 20G 0 part ??md0 9:0 0 20G 0 raid1 ??md0_vg-BFDlv (dm-0) 253:0 0 4G 0 lvm /boot ??md0_vg-vol1 (dm-1) 253:1 0 16G 0 lvm /mnt/system mtdblock0 31:0 0 504K 0 disk mtdblock1 31:1 0 4K 0 disk mtdblock2 31:2 0 4K 0 disk
Filesystem 1K-blocks Used Available Use% Mounted on rootfs 51200 4264 46936 9% / /dev/root.old 11339 3185 8154 29% /initrd none 51200 4264 46936 9% / /dev/md0_vg/BFDlv 4128448 714776 3203960 19% /boot /dev/loop0 691776 619873 71903 90% /mnt/apps /dev/loop1 7657 1013 6235 14% /mnt/etc none 7657 1013 6235 14% /etc /dev/loop2 128 128 0 100% /oem tmpfs 24776 80 24696 1% /run tmpfs 5120 4 5116 1% /run/lock tmpfs 49540 0 49540 0% /run/shm /dev/mapper/md0_vg-vol1 16493480 975516 15350400 6% /mnt/system /dev/mapper/529a853a_vg-lv1ac0e3be 3804366528 200884 3804165644 1% /mnt/pools/A/A0
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