On 02/04/2011 03:37 AM, John Haxby wrote:
On 4 February 2011 08:50, carlopmart <[email protected] <mailto:[email protected]>> wrote:Hi all, Is it possible to create sparse block devices with LVM (logical volumes not volume groups) on RHEL6 like ZFS does?? Do you mean something like this (from the lvcreate man page):"lvcreate --virtualsize 1T --size 100M --snapshot --name sparse vg1" creates a sparse device named /dev/vg1/sparse of size 1TB with spacefor just under 100MB of actual data on it.
Ok. Cool feature from a technical perspective....But...What is the use case? I'm trying to wrap my head over why I would want to overcommit a logical volume's usable storage. I'm assuming there is some use case where it makes sense, but I'm not seeing it. The closest I can come is that you might manually resize the lv's 'real' size if you ever got close to filling it up.
Enlighten me? -- Benjamin Franz
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