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It is possible, and present, however it is disabled by default because, as Jon said, it wasn’t considered necessary and therefore we didn’t enable it and test it to verify the functionality.

On the other hand, I have had success enabling it in specific scenarios, and while it is not a supported mode, if you’re using XCP I guess that you don’t have support from Citrix either way!

If you edit /opt/xensource/sm/cleanup.py, go to class FileSR and delete the “findLeafCoalesceable” method which simply returns None then it will use the base classes method and online leaf coalescing on EXT3 should work automatically.

Bob

From: xen-api-bounces@xxxxxxxxxxxxx [mailto:xen-api-bounces@xxxxxxxxxxxxx] On Behalf Of George Shuklin
Sent: 23 August 2013 08:52
To: Jonathan Ludlam
Cc: xen-api@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-API] Storage XenMotion

Good day.

It's kinda strange - newer version of XCP (1.6) and XenServer 6.2 had no anything related to leaf-coalesce. In XCP 1.1 there was plugin, in newer versions there is none.

... And manual vhd coalesce is really ugly way.

On 23.08.2013 03:50, Jonathan Ludlam wrote:

On an LVHD based SR, this should get automatically coalesced (so called 'online leaf-coalesce'). However, on file-based VHD SRs I believe the decision was taken not to do online leaf coalesce, as it wasn't felt necessary.

Having said that, you might find this link helps, though I haven't tried anything in it myself: http://support.citrix.com/article/CTX123400

Jon

Sent from my iPad

On 16 Aug 2013, at 14:51, "George Shuklin" <george.shuklin@xxxxxxxxx> wrote:

Good day.

After VDI migration there is base copy (vhd parent) disk for VDI's of newly migrated VM. I see no way to coalesce it back except manual operation with VHD (vhd-util coalesce -n VHD -o new.vhd, introducing it back to xapi and recreating VBD).

Is any way to do this?

Thanks.

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