[GTALUG] RAID and IX-2-dl
D. Hugh Redelmeier
hugh at mimosa.com
Thu Feb 19 21:56:12 UTC 2015
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
More information about the talk
mailing list