You need to specify a chunk size. Mine would fail building a RAID5 array
unless I specified a chunk=32k or larger. Leaving it blank and it failed.
At 03:35 PM 2/3/2000 -0600, [EMAIL PROTECTED] wrote:
>Hello,
>
>I am having a problem initializing a linear array. I am using kernel
>2.2.11 patched with raid0145-19990824-2.2.11 and
>raidtools-19990824-0.90.
>
>My conf file looks like this:
>
>raiddev /dev/md0
> raid-level linear
> nr-raid-disks 2
> persistent-superblock 1
> device /dev/sdb1
> raid-disk 0
> device /dev/sdc1
> raid-disk 1
>
>The system is Redhat 6.1 and I was sure to remove the raidtools rpm
>that came with the system before building and installing the raidtools
>I got from ftp.dk.kernel.org.
>
>`mkraid -c /etc/raid.linear /dev/md0` with the correct force flag
>gives the following output:
>
>handling MD device /dev/md0
>analyzing super-block
>disk 0: /dev/sdb1, 17880313kB, raid superblock at 17880192kB
>disk 1: /dev/sdc1, 17880313kB, raid superblock at 17880192kB
>/dev/md0: Invalid argument
>
>I got this same error when using the stock Redhat kernel and raidtools
>packages. I also made sure nothing was running in /proc/mdstat before
>attempting to initialize the linear array.
>
>I compiled all the raid levels directly into the kernel and said 'no'
>to the options Config.help said were unusable at the moment.
>
>/proc/mdstat looks like this:
>
>Personalities : [linear] [raid0] [raid1] [raid5]
>read_ahead 1024 sectors
>unused devices: <none>
>
>Is there anything I am doing wrong or is linear just not supported
>anymore because of a lack of interest?
>
>The system is going to be a web server where the average file size is
>12k and there are between 20 and 50 of these files pulled from the
>raid a second.
>
>I don't know much about raid or i/o performance but it seemed linear
>may give better performance with these small file sizes and frequent
>and distinct file accesses. I read ext2 distributes files across the
>device in a semi-even way so two similar partitions in a linear raid
>would potentially get close to the same usage.
>
>Is there anything I am missing or that I don't properly understand?
>
>Thanks in advance for any help!
>
>Jacob
>
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David Cooley N5XMT Internet: [EMAIL PROTECTED]
Packet: N5XMT@KQ4LO.#INT.NC.USA.NA T.A.P.R. Member #7068
We are Borg... Prepare to be assimilated!
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