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Re: [Xen-users] tap:ram anyone?
| To: | "Dylan Martin" <dmartin@xxxxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-users] tap:ram anyone? |
| From: | "Todd Deshane" <deshantm@xxxxxxxxx> |
| Date: | Fri, 9 Jan 2009 22:20:52 -0500 |
| Cc: | xen-users <xen-users@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Fri, 09 Jan 2009 19:21:48 -0800 |
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| Reply-to: | deshantm@xxxxxxxxx |
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On Fri, Jan 9, 2009 at 5:42 PM, Dylan Martin <dmartin@xxxxxxxxxxxx> wrote: > Has anyone ever tried the 'ram' driver with blktap for block devices? > It's mentioned here: > > http://wiki.xensource.com/xenwiki/blktap > > Fast shareable RAM disk between VMs (requires some form of > cluster-based filesystem support e.g. OCFS2 in the guest kernel) > > and poking around the source, in tools/blktap there is a README > (almost identical to the above web page) and the drivers themselves. > > I've been trying to get it to work on CentOS 5.2 to no avail. Specifically: > > block-attach domain 'tap:ram:/path/to/file' hdb w > > ..makes something appear in the output of block-list, but the domU > doesn't react at all. (nothing in dmesg, /dev/dhb is not found > etc...) Sadly, this is exactly the same thing that happens if you > specify a bogus tap driver, (EG tap:wibble:/path/to/file). > > I've tried tap:aio and tap:sync and they both work. > I haven't tried it personally. There has been very little development on it. see: http://lxr.mstier.de/Xen/source/xen_3.2.1/tools/blktap/drivers/block_ram.c?v=3.2.1 http://xen.markmail.org/search/?q=block_ram.c Maybe some hints in the code and/or changes since the CentOS Xen version. 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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