Interestingly enough your first partition has 26,608 blocks. now if a
block is 1k then that is close to 25 mb. looks like only the first
smallest partition is mirrored....
I guess what you really need to do is configure 10 separate raid
devices,
the first having sda1 and sdb1
the second with sda2 and sdb2
Then it will work.
otherwise you have 20 mirrors of the same partition....no earthly use at
all
Cheerio
Robin
Rajesh Fowkar wrote:
>
> Hi,
>
> I have got say 6 partitions on sda.
> I have created 6 partitions on sdb of equal size.
>
> My /etc/raidtab file is as follows :
>
> raiddev /dev/md0
> raid-level 1
> nr-raid-disks 6
> nr-spare-disks 0
> persistent-superblock 1
> chunk-size 4
>
> device /dev/sdb1 raid-disk 0
> device /dev/sdb5 raid-disk 1
> device /dev/sdb6 raid-disk 2
> device /dev/sdb7 raid-disk 3
> device /dev/sdb9 raid-disk 4
> device /dev/sdb10 raid-disk 5
> device /dev/sdb11 raid-disk 6
>
> If I mount /dev/md0 and If I type df -h it shows /dev/md0 mounted but the disk size
>is shown as only 25MB. Both the HDD are of 9GB each.
>
> How should I confirm whether Raid1 is working properly on our server ?
>
> How just by specifying sdb1, sdb2 etc. raid knows that I am mirroring sda1, sda2
>etc. to sdb1, sdb2 etc. respectively. Am I doing anything wrong here ?
>
> Unless I am sure that the other HDD is exact mirror copy of the first, I could not
>depend on this raid.
>
> My /proc/mdstat shows the following after I start raid through init scripts by
>giving the command
>
> raidstart /dev/md0
>
> <SNIP>
> Personalities : [raid1]
> read_ahead 1024 sectors
> md0 : active raid1 sdb11[6] sdb9[5] sdb7[4] sdb6[3] sdb5[2] sdb1[1] sdb10[0] 26496
>blocks [7/7] [UUUUUUU]
> unused devices: <none>
> <SNIP>
>
> My partitions are as follows :
> ------------------------------
> Disk /dev/sda: 64 heads, 32 sectors, 8683 cylinders
> Units = cylinders of 2048 * 512 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 26 26608 83 Linux
> /dev/sda2 27 8683 8864768 5 Extended
> /dev/sda5 27 4027 4097008 83 Linux
> /dev/sda6 4028 6028 2049008 83 Linux
> /dev/sda7 6029 7029 1025008 83 Linux
> /dev/sda8 7030 7530 513008 82 Linux swap
> /dev/sda9 7531 8031 513008 83 Linux
> /dev/sda10 8032 8532 513008 83 Linux
> /dev/sda11 8533 8683 154608 83 Linux
>
> Disk /dev/sdb: 64 heads, 32 sectors, 8683 cylinders
> Units = cylinders of 2048 * 512 bytes
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 1 26 26608 83 Linux
> /dev/sdb2 27 8683 8864768 5 Extended
> /dev/sdb5 27 4027 4097008 83 Linux
> /dev/sdb6 4028 6028 2049008 83 Linux
> /dev/sdb7 6029 7029 1025008 83 Linux
> /dev/sdb8 7030 7530 513008 82 Linux swap
> /dev/sdb9 7531 8031 513008 83 Linux
> /dev/sdb10 8032 8532 513008 83 Linux
> /dev/sdb11 8533 8683 154608 83 Linux
>
> This is my situation for the last one week. I am unable to find out whether raid1 is
>working properly because after mounting /dev/md0 it should have shows 9GB - HDD size
>instead it shows 25MB !!
>
> Please help me out of this
>
> Thanks
>
> --
> Rajesh(ALIAS Shriram) Fowkar
> --------------------------------------------------------------------------------
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> Do not dwell in the past, do not dream of the future, concentrate the mind
> on the present moment. - Buddha
>
> Scandisk is now checking your hard disk. You can start praying. - Anon. :-)
> ---------------------------------------------------------------------------------
>
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