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Re: Creating a zfs filesystem in CentOS 6.4
Does anyone have a how-to for this or for setting up zfs on Linux in
general that could be posted somewhere?
Kevin
Sent from my iPhone
On May 13, 2013, at 19:18, "dsavage@peaknet.net" <dsavage@peaknet.net> wrote:
> I knew I should have taken notes at the recent SILUG meeting when Steve
> was showing us how this was done... :-( I want to convert a RAID5 array
> from ext4 to zfs.
>
> If you don't want to read a bunch of background info, jump directly to my
> questions above my signature block.
>
> ----------------------------------------------------------------
>
> I'm using a SuperMicro dual quad-Athlon motherboard with an Adaptec
> zero-channel RAID card. I would like to use the on-board RAID firmware,
> but it's old and limited to volumes under 2G. Instead I use software RAID
> to merge nine 300GB SCSI3 drives on the Adaptec's two ports into a single
> meta-drive (md127p1).
>
> At the software level each drive looks like this:
>
> # fdisk -l /dev/sdb
>
> Disk /dev/sdb: 300.0 GB, 299965284352 bytes
> 255 heads, 63 sectors/track, 36468 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x0005204c
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 1 36468 292929178+ 83 Linux
>
> At the hardware level they look like this:
>
> md/raid:md127: device sdg operational as raid disk 5
> md/raid:md127: device sdf operational as raid disk 4
> md/raid:md127: device sdh operational as raid disk 6
> md/raid:md127: device sdj operational as raid disk 8
> md/raid:md127: device sdi operational as raid disk 7
> md/raid:md127: device sdc operational as raid disk 1
> md/raid:md127: device sdb operational as raid disk 0
> md/raid:md127: device sde operational as raid disk 3
> md/raid:md127: device sdd operational as raid disk 2
> md/raid:md127: allocated 9574kB
> md/raid:md127: raid level 5 active with 9 out of 9 devices,
> algorithm 2
> RAID conf printout:
> --- level:5 rd:9 wd:9
> disk 0, o:1, dev:sdb
> disk 1, o:1, dev:sdc
> disk 2, o:1, dev:sdd
> disk 3, o:1, dev:sde
> disk 4, o:1, dev:sdg
> disk 5, o:1, dev:sdg
> disk 6, o:1, dev:sdh
> disk 7, o:1, dev:sdi
> disk 8, o:1, dev:sdj
> md127: detected capacity change from 0 to 2399712313344
> md127: p1
>
> I mention this because zfs' documentation seems to think the
> number of SCSI channels is important. That said, I downloaded the
> dkms-enabled ZFS package like Steve did and installed it on my
> CentOS 6.4 server.
>
> # yum localinstall --nogpgcheck
> http://archive.zfsonlinux.org/epel/zfs-release-1-2.el6.noarch.rpm
> # yum -y install zfs
>
> Then I tried something simple (and intuitive):
>
> # mkfs zfs /dev/md127p1
> mk32fs 1.41.12 (17-May-2010)
> mkfs.ext2: invalid blocks count - /dev/md127p1
>
> Oops! I forgot that zfs isn't integrated into mkfs (yet). I seem to recall
> a 'create' command. So I tried this:
>
> # zfs create /dev/md127p1
> Failed to load ZFS module stack.
> Load the module manually by running 'insmod <location>/zfs.ko' as
> root.
> Failed to load ZFS module stack.
> Load the module manually by running 'insmod <location>/zfs.ko' as
> root.
>
> That's promising, but there's no zfs.ko anywhere on my disk. Do I have to
> make one. Something to do with dkms? Who knows?
>
> --Doc Savage
> Fairview Heights, IL
>
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