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Re: [Xen-users] Understanding sparse-files
| To: | "John Haxby" <john.haxby@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-users] Understanding sparse-files |
| From: | "Todd Deshane" <deshantm@xxxxxxxxx> |
| Date: | Tue, 16 Dec 2008 16:13:49 -0500 |
| Cc: | "Rustedt, Florian" <Florian.Rustedt@xxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Tue, 16 Dec 2008 13:15:13 -0800 |
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| Reply-to: | deshantm@xxxxxxxxx |
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> There are some problems with sparse files: the compress beautfully (gzip > reports 99.9%) but it takes a while to read the empty space and when you > uncompress the file you discover that it now actually occupies disk space: > there's no good way to distinguish between an unallocated block and a block > full of zeroes. This also means that you need to be careful how you back > these files up: you need something a little cleverer than gzip. You can use tar with the S (sparse) option here. Also I think that you should be able to use cp with a --sparse option as well. To distinguish, using the du command helps. Cheers, Todd -- Todd Deshane http://todddeshane.net http://runningxen.com _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users |
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