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Re: [linux-lvm] LVM on RAID



I should have been more clear. I'm not worried about LVM on one RAID. My questions is specifically about creating an LVM volume group ACROSS two RAID's.

For example, we have a 64bit linux server, with two different RAID devices attached to the host via Fiber. These RAID's are each 4TB volumes. The RAID is attached as /dev/sda and /dev/sdb. What I'm asking about is creating a LVM volume group, and joining /dev/sda AND /dev/sdb to that same volume group, creating the lv of 8TB (minus overhead of course), and then creating a filesystem on that lv. A 8TB filesystem, which is spanned (via LVM) across both RAID's.

Does anyone here do that? Reading all the reply's I realize I wasn't clear enough about that, and neither was anyone's responses.

Alex

On Wed, 20 Sep 2006, Matthew B. Brookover wrote:

I have used LVM on top of software raid and ISCSI.  It works well.  It
also helps keep track of what device is where.  ISCSI does not export
its targets in the same order, some times sdb shows up as sdc....   LVM
will keep track of what is what.

Matt

On Tue, 2006-09-19 at 16:53 -0500, Alexander Lazarevich wrote:

We have several RAID devices (16-24 drive Fiber/SCSI attached RAID) which
are currently single devices on our 64bit linux servers (RHEL-4, core5).
We are considering LVM'ing 2 or more of the RAID's into a LVM group. I
don't doubt the reliability and robustness of LVM2 on single drives, but I
worry about it on top of RAID devices.

Does anyone have any experience with LVM on to of RAID volumes, positive
or negative?

Thanks,

Alex

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