[Users] what is "distributed image repository"
------=_Part_178360_1212166963.1361958282453 Content-Type: text/plain; charset=GBK Content-Transfer-Encoding: 7bit there is a sentense 'Implements a distributed image repository over the supported storage types (local directory, FCP, FCoE, iSCSI, NFS, SAS) ' on http://www.ovirt.org/Architecture. what is "distributed image repository"? thanks. ------=_Part_178360_1212166963.1361958282453 Content-Type: text/html; charset=GBK Content-Transfer-Encoding: 7bit <div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">there is a sentense '<span style="line-height: 1.7;">Implements a distributed image repository over the supported storage types (local directory, FCP, FCoE, iSCSI, NFS, SAS)</span><br>' on <a href="http://www.ovirt.org/Architecture." target="_blank">http://www.ovirt.org/Architecture.</a><div><br></div><div>what is "distributed image repository"? </div><div><br></div><div>thanks.</div></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span> ------=_Part_178360_1212166963.1361958282453--
On Wed, Feb 27, 2013 at 10:44 AM, bigclouds wrote:
there is a sentense 'Implements a distributed image repository over the supported storage types (local directory, FCP, FCoE, iSCSI, NFS, SAS) ' on http://www.ovirt.org/Architecture.
what is "distributed image repository"?
thanks.
Example I have a test environment where a Host is connected to several FCP LUNs. Each LUN becomes a storage domain for this host and the other hosts in the same cluster. So I have many VMs whose images resides on different storage domains (and so different LUNs). I can move a disk of a VM from a storage domain to another one. I think you can also have a mixed situation where a two disks' VM has one disk on a storage domain and the other one in another. So I think it is to be explained this way the "distributed image repository". And also "distributed" in the sense of different storage domain types, even if I think at this time one DC cannot have a mix of different storage domain types... Gianluca
------=_Part_188393_848930197.1361962267490 Content-Type: text/plain; charset=GBK Content-Transfer-Encoding: 7bit thanks,i know a little more. but i do not understand fully. distrubute filesystem is more understandable. specially,,for SAN(iscsi,fc) it is hard to share luns between nodes(not reliable), even use LVM,CLVM. would you explain it ( SAN case)?and it is hard to connect 'local directory' with distrbuted repo. thanks. At 2013-02-27 17:55:45,"Gianluca Cecchi" <gianluca.cecchi@gmail.com> wrote:
On Wed, Feb 27, 2013 at 10:44 AM, bigclouds wrote:
there is a sentense 'Implements a distributed image repository over the supported storage types (local directory, FCP, FCoE, iSCSI, NFS, SAS) ' on http://www.ovirt.org/Architecture.
what is "distributed image repository"?
thanks.
Example I have a test environment where a Host is connected to several FCP LUNs. Each LUN becomes a storage domain for this host and the other hosts in the same cluster. So I have many VMs whose images resides on different storage domains (and so different LUNs). I can move a disk of a VM from a storage domain to another one. I think you can also have a mixed situation where a two disks' VM has one disk on a storage domain and the other one in another.
So I think it is to be explained this way the "distributed image repository".
And also "distributed" in the sense of different storage domain types, even if I think at this time one DC cannot have a mix of different storage domain types...
Gianluca
------=_Part_188393_848930197.1361962267490 Content-Type: text/html; charset=GBK Content-Transfer-Encoding: 7bit <div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial"><br>thanks,i know a little more. but i do not understand fully. distrubute filesystem is more understandable.<div style="font-family: Helvetica, 'Microsoft Yahei', verdana;">specially,,for SAN(iscsi,fc) it is hard to share luns between nodes(not reliable), even use LVM,CLVM.</div><div style="font-family: Helvetica, 'Microsoft Yahei', verdana;"><br></div><div style="font-family: Helvetica, 'Microsoft Yahei', verdana;">would you explain it ( SAN case)?and it is hard to connect '<span style="white-space: pre-wrap; line-height: 1.7;">local directory</span><span style="line-height: 1.7;">' with distrbuted repo.</span></div><div style="font-family: Helvetica, 'Microsoft Yahei', verdana;"><br><br>thanks.<br></div><div><br></div><br><br><br><div></div><div id="divNeteaseMailCard"></div><br><pre><br>At 2013-02-27 17:55:45,"Gianluca Cecchi" <gianluca.cecchi@gmail.com> wrote: >On Wed, Feb 27, 2013 at 10:44 AM, bigclouds wrote: >> there is a sentense 'Implements a distributed image repository over the >> supported storage types (local directory, FCP, FCoE, iSCSI, NFS, SAS) >> ' on http://www.ovirt.org/Architecture. >> >> what is "distributed image repository"? >> >> thanks. > >Example >I have a test environment where a Host is connected to several FCP LUNs. >Each LUN becomes a storage domain for this host and the other hosts in >the same cluster. >So I have many VMs whose images resides on different storage domains >(and so different LUNs). >I can move a disk of a VM from a storage domain to another one. >I think you can also have a mixed situation where a two disks' VM has >one disk on a storage domain and the other one in another. > >So I think it is to be explained this way the "distributed image repository". > >And also "distributed" in the sense of different storage domain types, >even if I think at this time one DC cannot have a mix of different >storage domain types... > >Gianluca </pre></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span> ------=_Part_188393_848930197.1361962267490--
On 02/27/2013 12:51 PM, bigclouds wrote:
thanks,i know a little more. but i do not understand fully. distrubute filesystem is more understandable. specially,,for SAN(iscsi,fc) it is hard to share luns between nodes(not reliable), even use LVM,CLVM.
would you explain it ( SAN case)?and it is hard to connect 'local directory' with distrbuted repo.
true. even a single LUN, turned into a VG with LVM, can be used by all nodes in the cluster. an LV is created for each disk element (part of a chain in the disk construct). it's "like CLVM", only using only a single node (the "SPM") to do the meta data changes (lvcreate) and other hosts to only consume the LV's for running VMs. this allows to scale to clusters of 50, 100 or more nodes. HTH, Itamar
thanks.
At 2013-02-27 17:55:45,"Gianluca Cecchi" <gianluca.cecchi@gmail.co m> wrote:
On Wed, Feb 27, 2013 at 10:44 AM, bigclouds wrote:
there is a sentense 'Implements a distributed image repository over the supported storage types (local directory, FCP, FCoE, iSCSI, NFS, SAS) ' on http://www.ovirt.org/Architecture.
what is "distributed image repository"?
thanks.
Example I have a test environment where a Host is connected to several FCP LUNs. Each LUN becomes a storage domain for this host and the other hosts in the same cluster. So I have many VMs whose images resides on different storage domains (and so different LUNs). I can move a disk of a VM from a storage domain to another one. I think you can also have a mixed situation where a two disks' VM has one disk on a storage domain and the other one in another.
So I think it is to be explained this way the "distributed image repository".
And also "distributed" in the sense of different storage domain types, even if I think at this time one DC cannot have a mix of different storage domain types...
Gianluca
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participants (3)
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bigclouds -
Gianluca Cecchi -
Itamar Heim