virtio-scsi drive order?
Hi list! When we upgraded our ovirt environment to 4.1 we get the virtio-scsi interface as default for virtual disks. We have seen a difference in drive order from when we used the virtio interface. Before when we added disks the order of the drives were set by which order the disks was created. So if i had 1 disk as os disk it became vda and added a 50 GB disk that disk became vdb and then added another 8GB disk that became vdc. But now when i add two additional disks with the virtio-scsi interface like the above when i reboot the vm the 50GB disk become sdc and the 8GB disk become sdb even that i created the 50GB disk first? How is the order decided in the virtio-scsi interface? What can i do to ensure that the disks come in the order that i create them? Regards Christian
On Mar 16, 2017 9:23 AM, "gflwqs gflwqs" <gflwqs@gmail.com> wrote: Hi list! When we upgraded our ovirt environment to 4.1 we get the virtio-scsi interface as default for virtual disks. We have seen a difference in drive order from when we used the virtio interface. Before when we added disks the order of the drives were set by which order the disks was created. So if i had 1 disk as os disk it became vda and added a 50 GB disk that disk became vdb and then added another 8GB disk that became vdc. But now when i add two additional disks with the virtio-scsi interface like the above when i reboot the vm the 50GB disk become sdc and the 8GB disk become sdb even that i created the 50GB disk first? How is the order decided in the virtio-scsi interface? What can i do to ensure that the disks come in the order that i create them? Based on their id on the scsi bus. Use /dev/disk-by-id or so and not sdX which might change. Y. Regards Christian _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
On 16/03/17 08:23 +0100, gflwqs gflwqs wrote:
Hi list! When we upgraded our ovirt environment to 4.1 we get the virtio-scsi interface as default for virtual disks. We have seen a difference in drive order from when we used the virtio interface.
Before when we added disks the order of the drives were set by which order the disks was created. So if i had 1 disk as os disk it became vda and added a 50 GB disk that disk became vdb and then added another 8GB disk that became vdc.
But now when i add two additional disks with the virtio-scsi interface like the above when i reboot the vm the 50GB disk become sdc and the 8GB disk become sdb even that i created the 50GB disk first? How is the order decided in the virtio-scsi interface? What can i do to ensure that the disks come in the order that i create them?
Regards Christian
Could you post the XML (virsh -r list, note the domain number and virsh -r dumpxml $domainnumber) before and after adding the disks? Need to see whether there are also any iothreads or anything else. Thanks, mpolednik
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On Thu, Mar 16, 2017 at 11:56 AM, Martin Polednik <mpolednik@redhat.com> wrote:
On 16/03/17 08:23 +0100, gflwqs gflwqs wrote:
Hi list! When we upgraded our ovirt environment to 4.1 we get the virtio-scsi interface as default for virtual disks. We have seen a difference in drive order from when we used the virtio interface.
Before when we added disks the order of the drives were set by which order the disks was created. So if i had 1 disk as os disk it became vda and added a 50 GB disk that disk became vdb and then added another 8GB disk that became vdc.
But now when i add two additional disks with the virtio-scsi interface like the above when i reboot the vm the 50GB disk become sdc and the 8GB disk become sdb even that i created the 50GB disk first? How is the order decided in the virtio-scsi interface? What can i do to ensure that the disks come in the order that i create them?
Regards Christian
Could you post the XML (virsh -r list, note the domain number and virsh -r dumpxml $domainnumber) before and after adding the disks? Need to see whether there are also any iothreads or anything else.
It doesn't matter - the order of disk discovery on the SCSI bus (by udev?) is quite random. You must use /dev/disk/by-id/scsi-... Y.
Thanks, mpolednik
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Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
On 16 Mar 2017, at 11:12, Yaniv Kaul <ykaul@redhat.com> wrote: =20 =20 =20 On Thu, Mar 16, 2017 at 11:56 AM, Martin Polednik = <mpolednik@redhat.com <mailto:mpolednik@redhat.com>> wrote: On 16/03/17 08:23 +0100, gflwqs gflwqs wrote: Hi list! When we upgraded our ovirt environment to 4.1 we get the virtio-scsi interface as default for virtual disks. We have seen a difference in drive order from when we used the virtio interface. =20 Before when we added disks the order of the drives were set by which = order the disks was created. So if i had 1 disk as os disk it became vda and added a 50 GB disk =
disk became vdb and then added another 8GB disk that became vdc. =20 But now when i add two additional disks with the virtio-scsi interface =
the above when i reboot the vm the 50GB disk become sdc and the 8GB = disk become sdb even that i created the 50GB disk first? How is the order decided in the virtio-scsi interface? What can i do to ensure that the disks come in the order that i create =
--Apple-Mail=_9E038410-3C50-4055-B967-7FE43616EA54 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 that like them?
=20 Regards Christian =20 Could you post the XML (virsh -r list, note the domain number and virsh -r dumpxml $domainnumber) before and after adding the disks? Need to see whether there are also any iothreads or anything else. =20 It doesn't matter - the order of disk discovery on the SCSI bus (by = udev?) is quite random. You must use /dev/disk/by-id/scsi-=E2=80=A6
well, it may in case we are actually doing something wrong with = controllers or iothreads due to recent changes in that area.
=20 Y. =20 =20 Thanks, mpolednik =20 =20 _______________________________________________ Users mailing list Users@ovirt.org <mailto:Users@ovirt.org> http://lists.ovirt.org/mailman/listinfo/users = <http://lists.ovirt.org/mailman/listinfo/users> =20 _______________________________________________ Users mailing list Users@ovirt.org <mailto:Users@ovirt.org> http://lists.ovirt.org/mailman/listinfo/users = <http://lists.ovirt.org/mailman/listinfo/users> =20 _______________________________________________ Users mailing list Users@ovirt.org <mailto:Users@ovirt.org> http://lists.ovirt.org/mailman/listinfo/users = <http://lists.ovirt.org/mailman/listinfo/users>
--Apple-Mail=_9E038410-3C50-4055-B967-7FE43616EA54 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html = charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><br class=3D""><div><blockquote type=3D"cite" class=3D""><div = class=3D"">On 16 Mar 2017, at 11:12, Yaniv Kaul <<a = href=3D"mailto:ykaul@redhat.com" class=3D"">ykaul@redhat.com</a>> = wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div = dir=3D"ltr" style=3D"font-family: Helvetica; font-size: 12px; = font-style: normal; font-variant-caps: normal; font-weight: normal; = 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;" class=3D""><div = class=3D"gmail_extra"><br class=3D"Apple-interchange-newline"><br = class=3D""><div class=3D"gmail_quote">On Thu, Mar 16, 2017 at 11:56 AM, = Martin Polednik<span class=3D"Apple-converted-space"> </span><span = dir=3D"ltr" class=3D""><<a href=3D"mailto:mpolednik@redhat.com" = target=3D"_blank" class=3D"">mpolednik@redhat.com</a>></span><span = class=3D"Apple-converted-space"> </span>wrote:<br = class=3D""><blockquote class=3D"gmail_quote" style=3D"margin: 0px 0px = 0px 0.8ex; border-left-width: 1px; border-left-style: solid; = border-left-color: rgb(204, 204, 204); padding-left: 1ex;"><div = class=3D"gmail-HOEnZb"><div class=3D"gmail-h5">On 16/03/17 08:23 +0100, = gflwqs gflwqs wrote:<br class=3D""><blockquote class=3D"gmail_quote" = style=3D"margin: 0px 0px 0px 0.8ex; border-left-width: 1px; = border-left-style: solid; border-left-color: rgb(204, 204, 204); = padding-left: 1ex;">Hi list!<br class=3D"">When we upgraded our ovirt = environment to 4.1 we get the virtio-scsi<br class=3D"">interface as = default for virtual disks.<br class=3D"">We have seen a difference in = drive order from when we used the virtio<br class=3D"">interface.<br = class=3D""><br class=3D"">Before when we added disks the order of the = drives were set by which order<br class=3D"">the disks was created.<br = class=3D"">So if i had 1 disk as os disk it became vda and added a 50 GB = disk that<br class=3D"">disk became vdb and then added another 8GB disk = that became vdc.<br class=3D""><br class=3D"">But now when i add two = additional disks with the virtio-scsi interface like<br class=3D"">the = above when i reboot the vm the 50GB disk become sdc and the 8GB disk<br = class=3D"">become sdb even that i created the 50GB disk first?<br = class=3D"">How is the order decided in the virtio-scsi interface?<br = class=3D"">What can i do to ensure that the disks come in the order that = i create them?<br class=3D""><br class=3D"">Regards<br = class=3D"">Christian<br class=3D""></blockquote><br = class=3D""></div></div>Could you post the XML (virsh -r list, note the = domain<br class=3D"">number and virsh -r dumpxml $domainnumber) before = and after adding the<br class=3D"">disks? Need to see whether there are = also any iothreads or anything<br class=3D"">else.<br = class=3D""></blockquote><div class=3D""><br class=3D""></div><div = class=3D"">It doesn't matter - the order of disk discovery on the SCSI = bus (by udev?) is quite random.</div><div class=3D"">You must use = /dev/disk/by-id/scsi-=E2=80=A6</div></div></div></div></div></blockquote><= div><br class=3D""></div>well, it may in case we are actually doing = something wrong with controllers or iothreads due to recent changes in = that area.</div><div><br class=3D""><blockquote type=3D"cite" = class=3D""><div class=3D""><div dir=3D"ltr" style=3D"font-family: = Helvetica; font-size: 12px; font-style: normal; font-variant-caps: = normal; font-weight: normal; 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;" class=3D""><div class=3D"gmail_extra"><div = class=3D"gmail_quote"><div class=3D""><br class=3D""></div><div = class=3D"">Y.</div><div class=3D""> </div><blockquote = class=3D"gmail_quote" style=3D"margin: 0px 0px 0px 0.8ex; = border-left-width: 1px; border-left-style: solid; border-left-color: = rgb(204, 204, 204); padding-left: 1ex;"><br class=3D"">Thanks,<br = class=3D"">mpolednik<div class=3D"gmail-HOEnZb"><div = class=3D"gmail-h5"><br class=3D""><br class=3D""><blockquote = class=3D"gmail_quote" style=3D"margin: 0px 0px 0px 0.8ex; = border-left-width: 1px; border-left-style: solid; border-left-color: = rgb(204, 204, 204); padding-left: = 1ex;">______________________________<wbr class=3D"">_________________<br = class=3D"">Users mailing list<br class=3D""><a = href=3D"mailto:Users@ovirt.org" target=3D"_blank" = class=3D"">Users@ovirt.org</a><br class=3D""><a = href=3D"http://lists.ovirt.org/mailman/listinfo/users" rel=3D"noreferrer" = target=3D"_blank" class=3D"">http://lists.ovirt.org/mailman<wbr = class=3D"">/listinfo/users</a><br class=3D""></blockquote><br = class=3D"">______________________________<wbr = class=3D"">_________________<br class=3D"">Users mailing list<br = class=3D""><a href=3D"mailto:Users@ovirt.org" target=3D"_blank" = class=3D"">Users@ovirt.org</a><br class=3D""><a = href=3D"http://lists.ovirt.org/mailman/listinfo/users" rel=3D"noreferrer" = target=3D"_blank" class=3D"">http://lists.ovirt.org/mailman<wbr = class=3D"">/listinfo/users</a><br = class=3D""></div></div></blockquote></div><br class=3D""></div></div><span= style=3D"font-family: Helvetica; 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participants (4)
-
gflwqs gflwqs -
Martin Polednik -
Michal Skrivanek -
Yaniv Kaul