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Re: [Xen-devel] [patch] Add support for barriers to blk{back,front} driv
| To: | Gerd Hoffmann <kraxel@xxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [patch] Add support for barriers to blk{back,front} drivers. |
| From: | Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> |
| Date: | Thu, 09 Nov 2006 13:47:36 +0000 |
| Cc: | Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Thu, 09 Nov 2006 05:47:51 -0800 |
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| Thread-topic: | [Xen-devel] [patch] Add support for barriers to blk{back,front} drivers. |
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On 9/11/06 12:48, "Gerd Hoffmann" <kraxel@xxxxxxx> wrote: >> What happens (even on native Linux) if you have, say, a RAID array in which >> some of the discs support barriers and others don't? > > The raid0 driver doesn't support barriers in the first place. Not sure > about the other raid drivers. Does this mean journalling filesystems cannot run reliably on top of RAID-0? That sounds a bit concerning! What about when running on top of LVM, where an LV is stitched together from bits of various PVs. Some may support barriers, some may not. Running on top of LVM is default for most distros, so surely it must have a story on write barriers? -- Keir _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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