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Re: [Qemu-devel] [PATCHv2] block: add native support for NFS
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS |
Date: |
Wed, 18 Dec 2013 11:38:35 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130923 Thunderbird/17.0.9 |
Il 18/12/2013 11:24, Orit Wasserman ha scritto:
>>>
>>> For live migration we need the sync option (async ignores O_SYNC and
>>> O_DIRECT sadly),
>>> will it be supported? or will it be the default?
>>
>> Since this is bypassing the client kernel FS I/O layer question around
>> support of things like O_SYNC/O_DIRECT are not applicable.
>>
>
> so no live migration support?
No, live migration just works.
O_SYNC is not used anymore in QEMU, we just issue a flush after every write.
And all protocol drivers except files/block devices _always_ bypass the
kernel page cache (libiscsi, NBD, ceph, and now libnfs) so they are
always behaving as if they had O_DIRECT. For these protocols,
cache=writeback and cache=none are entirely the same.
Paolo
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, (continued)
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, ronnie sahlberg, 2013/12/17
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Daniel P. Berrange, 2013/12/17
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Peter Lieven, 2013/12/17
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Daniel P. Berrange, 2013/12/18
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Orit Wasserman, 2013/12/18
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Daniel P. Berrange, 2013/12/18
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Orit Wasserman, 2013/12/18
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS,
Paolo Bonzini <=
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Peter Lieven, 2013/12/18
- Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Paolo Bonzini, 2013/12/19
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Peter Lieven, 2013/12/18
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Orit Wasserman, 2013/12/18
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, ronnie sahlberg, 2013/12/18
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Peter Lieven, 2013/12/18
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, ronnie sahlberg, 2013/12/18
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Peter Lieven, 2013/12/18
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, ronnie sahlberg, 2013/12/18
Re: [Qemu-devel] [PATCHv2] block: add native support for NFS, Peter Lieven, 2013/12/18