Il giorno 21 feb 2017, alle ore 18:26, Nir Soffer <nsoffer@redhat.com> = ha scritto: =20 On Tue, Feb 21, 2017 at 3:20 PM, Matteo Dacrema <mdacrema@enter.eu> = wrote:
Hi Nir, =20 thank you. So, can I use a Ceph backed VM with a lease on gluster? =20 Should work. =20 Also if I detach network from the node hosting the VMs it will not = migrated to another host. =20 If you have a lease, detaching the network used to access the leases = will cause sanlock to terminate the vm and expire the lease. In this case =
system should start the vm on another host. =20 Note that if you have multiple networks, and the network used by the = vm disks is different from the network used to access the leases, all =
not work in a useful way. =20 Either the leases will not be accessible while the vm disks are = accessible, leading to killing a good working vm, or the vm disk are not = accessible, pausing the vm, but since the leases are still accessible, the vm will = not release the lease and the system will not be able to start the vm = elsewhere. =20 Maybe you can expose some of the ceph storage using cephfs for the = leases? This will make it more likely that the leases storage domain will fail when there is some issue with your ceph cluster. =20 Another option is to expose ceph block device using iscsi, and use =
--Apple-Mail=_72C64DCD-D499-4420-9B77-C510AEDD3447 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii Ok, it works. Thank you very much Nir. Matteo the this may this iscsi
storage domain for the leases. But note that this makes your iscsi = gateway host a single point on failure. =20 Nir _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users =20 -- Questo messaggio e' stato analizzato con Libra ESVA ed e' risultato = non infetto. Seguire il link qui sotto per segnalarlo come spam:=20 http://mx01.enter.it/cgi-bin/learn-msg.cgi?id=3DD2CE14011D.A4808 =20 =20
--Apple-Mail=_72C64DCD-D499-4420-9B77-C510AEDD3447 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html = charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D"">Ok, it works.<div class=3D""><br class=3D""></div><div = class=3D"">Thank you very much Nir.</div><div class=3D""><br = class=3D""></div><div class=3D"">Matteo<br class=3D""><div class=3D""> <div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; orphans: = auto; text-align: start; text-indent: 0px; text-transform: none; = white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><div style=3D"color: rgb(0, 0, 0); letter-spacing: normal; = orphans: auto; text-align: start; text-indent: 0px; text-transform: = none; white-space: normal; widows: auto; word-spacing: 0px; = -webkit-text-stroke-width: 0px; word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><div style=3D"font-family: Calibri; font-size: 15px;" = class=3D""><br class=3D""></div><div id=3D"signature_old" class=3D""><div = id=3D"x230f9618d8214c5" class=3D""><div class=3D"WordSection1" = style=3D"page: WordSection1;"><div style=3D"font-family: 'Times New = Roman', serif; font-size: 12pt; margin: 0cm 0cm 0.0001pt;" = class=3D""><font face=3D"Calibri" style=3D"font-size: 11pt;" = class=3D""><br class=3D""></font></div><div style=3D"font-family: 'Times = New Roman', serif; font-size: 12pt; margin: 0cm 0cm 0.0001pt;" = class=3D""><div class=3D"" style=3D"font-family: Helvetica; font-size: = 12px;"><br = class=3D""></div></div></div></div></div></div></div></div></div></div></d= iv></div></div><div style=3D""><blockquote type=3D"cite" class=3D""><div = class=3D"">Il giorno 21 feb 2017, alle ore 18:26, Nir Soffer <<a = href=3D"mailto:nsoffer@redhat.com" class=3D"">nsoffer@redhat.com</a>> = ha scritto:</div><br class=3D"Apple-interchange-newline"><div = class=3D""><div class=3D"">On Tue, Feb 21, 2017 at 3:20 PM, Matteo = Dacrema <<a href=3D"mailto:mdacrema@enter.eu" = class=3D"">mdacrema@enter.eu</a>> wrote:<br class=3D""><blockquote = type=3D"cite" class=3D"">Hi Nir,<br class=3D""><br class=3D"">thank = you.<br class=3D"">So, can I use a Ceph backed VM with a lease on = gluster?<br class=3D""></blockquote><br class=3D"">Should work.<br = class=3D""><br class=3D""><blockquote type=3D"cite" class=3D"">Also if I = detach network from the node hosting the VMs it will not migrated<br = class=3D"">to another host.<br class=3D""></blockquote><br class=3D"">If = you have a lease, detaching the network used to access the leases = will<br class=3D"">cause sanlock to terminate the vm and expire the = lease. In this case the<br class=3D"">system should start the vm on = another host.<br class=3D""><br class=3D"">Note that if you have = multiple networks, and the network used by the vm<br class=3D"">disks is = different from the network used to access the leases, all this may<br = class=3D"">not work in a useful way.<br class=3D""><br class=3D"">Either = the leases will not be accessible while the vm disks are accessible,<br = class=3D"">leading to killing a good working vm, or the vm disk are not = accessible,<br class=3D"">pausing the vm, but since the leases are still = accessible, the vm will not<br class=3D"">release the lease and the = system will not be able to start the vm elsewhere.<br class=3D""><br = class=3D"">Maybe you can expose some of the ceph storage using cephfs = for the leases?<br class=3D"">This will make it more likely that the = leases storage domain will fail<br class=3D"">when there<br class=3D"">is = some issue with your ceph cluster.<br class=3D""><br class=3D"">Another = option is to expose ceph block device using iscsi, and use this iscsi<br = class=3D"">storage domain for the leases. But note that this makes your = iscsi gateway<br class=3D"">host a single point on failure.<br = class=3D""><br class=3D"">Nir<br = class=3D"">_______________________________________________<br = class=3D"">Users mailing list<br class=3D""><a = href=3D"mailto:Users@ovirt.org" class=3D"">Users@ovirt.org</a><br = class=3D"">http://lists.ovirt.org/mailman/listinfo/users<br class=3D""><br= class=3D"">--<br class=3D"">Questo messaggio e' stato analizzato con = Libra ESVA ed e' risultato non infetto.<br class=3D"">Seguire il link = qui sotto per segnalarlo come spam: <br = class=3D"">http://mx01.enter.it/cgi-bin/learn-msg.cgi?id=3DD2CE14011D.A480= 8<br class=3D""><br class=3D""><br = class=3D""></div></div></blockquote></div><br = class=3D""></div></body></html>= --Apple-Mail=_72C64DCD-D499-4420-9B77-C510AEDD3447--