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Re: [Qemu-devel] qmp block-mirror hang, lots of nfs op/s on nfs source d
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From: |
Alexandre DERUMIER |
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Subject: |
Re: [Qemu-devel] qmp block-mirror hang, lots of nfs op/s on nfs source disk |
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Date: |
Mon, 11 May 2015 14:03:33 +0200 (CEST) |
>>That is because drive-mirror checks the whole disk for allocated areas.
Oh, ok, that's why I'm seeing a lot of lseek in strace
lseek(21, 1447493632, 0x4 /* SEEK_??? */) = 107374182400
lseek(21, 1447559168, 0x3 /* SEEK_??? */) = 1447559168
lseek(21, 1447559168, 0x4 /* SEEK_??? */) = 107374182400
lseek(21, 1447624704, 0x3 /* SEEK_??? */) = 1447624704
lseek(21, 1447624704, 0x4 /* SEEK_??? */) = 107374182400
lseek(21, 1447690240, 0x3 /* SEEK_??? */) = 1447690240
lseek(21, 1447690240, 0x4 /* SEEK_??? */) = 107374182400
...
>>We are aware of that and Fam (CCed) is working on it. Thanks for the
>>report nevertheless!
Ok, thanks !
----- Mail original -----
De: "pbonzini" <address@hidden>
À: "aderumier" <address@hidden>, "qemu-devel" <address@hidden>, "Fam Zheng"
<address@hidden>
Envoyé: Lundi 11 Mai 2015 13:46:54
Objet: Re: qmp block-mirror hang, lots of nfs op/s on nfs source disk
On 11/05/2015 13:38, Alexandre DERUMIER wrote:
> Hi,
>
> I'm currently playing with drive-mirror, (qemu 2.2)
>
> and I have qmp hang when drive-mirror is starting.
>
> just after qmp "drive-mirror" exec, qmp socket or hmp are not
> responding.
>
> After some times it's working again, and I can see result of
> query-block-jobs.
>
>
> The source volume is on nfs (v4), and it seem that the bigger the
> volume is, the bigger I need to wait before the mirror begin.
That is because drive-mirror checks the whole disk for allocated areas.
We are aware of that and Fam (CCed) is working on it. Thanks for the
report nevertheless!
Paolo