[GTALUG] RAID and IX-2-dl
William Park
opengeometry at yahoo.ca
Fri Feb 20 05:10:45 UTC 2015
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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