On 28/11/11 18:15, John Thompson wrote:
So I'm setting up a lvm striping plus mirrorring configuration with 4 disks
to use for a Universe database in Linux.

And I'm curious, what block size does UV write in?

Is it 4k blocks?  Less or more than that?

By default, iirc, it's 4K. INFORMATION was 2K. But why should that matter as far as your RAID is concerned?

As far as lvm or raid, what stripe sizes are your RAID arrays or LVM
volumes set to?  64k?

And what size does your DISKS have their buffers set to? I think the modern default is 4 *meg*.

Our current machine is set to 64K, but, I was just curious if there is some
recommended size to use.
I am referring to a stripe size in a RAID array or lvm logical volume.

Can't give you any advice, unfortunately, other than to say it's complicated, and you probably need a specialist. If you're running licenced RHEL, I'd get Red Hat to advise. My instinct would be to go for whatever the disk buffers are, but I think that's the wrong choice...

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