Re: [ovirt-users] Concerns with increasing vdsTimeout value on engine?

Thanks for the responses everyone and for the RFE. I do use HA in some places at the moment, but I do see another timeout value called vdsConnectionTimeout. Would HA use this value or vdsTimeout (set to 2 by default) when attempting to contact the host?

-----Original Message----- From: Shubhendu Tripathi [mailto:shtripat@redhat.com] Sent: Monday, July 13, 2015 2:25 AM To: Piotr Kliczewski Cc: Omer Frenkel; Groten, Ryan; users(a)ovirt.org Subject: Re: [ovirt-users] Concerns with increasing vdsTimeout value on engine? On 07/13/2015 01:42 PM, Piotr Kliczewski wrote: > On Mon, Jul 13, 2015 at 5:57 AM, Shubhendu Tripathi <shtripat(a)redhat.com&gt; wrote: >> On 07/12/2015 09:53 PM, Omer Frenkel wrote: >>> >>> ----- Original Message ----- >>>> From: "Liron Aravot" <laravot(a)redhat.com&gt; >>>> To: "Ryan Groten" <Ryan.Groten(a)stantec.com&gt; >>>> Cc: users(a)ovirt.org >>>> Sent: Sunday, July 12, 2015 5:44:28 PM >>>> Subject: Re: [ovirt-users] Concerns with increasing vdsTimeout >>>> value on engine? >>>> >>>> >>>> >>>> ----- Original Message ----- >>>>> From: "Ryan Groten" <Ryan.Groten(a)stantec.com&gt; >>>>> To: users(a)ovirt.org >>>>> Sent: Friday, July 10, 2015 10:45:11 PM >>>>> Subject: [ovirt-users] Concerns with increasing vdsTimeout value >>>>> on engine? >>>>> >>>>> >>>>> >>>>> When I try to attach new direct lun disks, the scan takes a very >>>>> long time to complete because of the number of pvs presented to my >>>>> hosts (there is already a bug on this, related to the pvcreate >>>>> command taking a very long time - >>>>> https://bugzilla.redhat.com/show_bug.cgi?id=1217401 ) >>>>> >>>>> >>>>> >>>>> I discovered a workaround by setting the vdsTimeout value higher >>>>> (it is >>>>> 180 >>>>> seconds by default). I changed it to 300 seconds and now the >>>>> direct lun scan returns properly, but I’m hoping someone can warn >>>>> me if this workaround is safe or if it’ll cause other potential >>>>> issues? I made this change yesterday and so far so good. >>>>> >>>> Hi, no serious issue can be caused by that. >>>> Keep in mind though that any other operation will have that amount >>>> of time to complete before failing on timeout - which will cause >>>> delays before failing (as the timeout was increased for all >>>> executions) >>>> when not everything is operational and up as expected (as in most >>>> of the time). >>>> I'd guess that a RFE could be opened to allow increasing the >>>> timeout of specific operations if a user want to do that. >>>> >>>> thanks, >>>> Liron. >>> if you have HA vms and use power management (fencing), this might >>> cause longer downtime for HA vms if host has network timeouts: >>> the engine will wait for 3 network failures before trying to fence >>> the host, so in case of timeouts, and increasing it to 5mins, you >>> should expect 15mins before engine will decide host is >>> non-responsive and fence, so if you have HA vm on this host, this >>> will be the vm downtime as well, as the engine will restart HA vms >>> only after fencing. >>> >>> you can read more on >>> http://www.ovirt.org/Automatic_Fencing >> >> Even I am in a need where, I try to delete all the 256 gluster volume >> snapshots using a single gluster CLI command, and engine gets timed out. >> So, as Liron suggested it would be better if at VDSM verb level we >> are able to set timeout. That would be better option and caller needs >> to use the feature judicially :) >> > Please open a RFE for being able to set operation timeout for single > command call with description of use cases for which you would like to > set the timeout. Piotr, I created an RFE BZ at https://bugzilla.redhat.com/show_bug.cgi?id=1242373. Thanks and Regards, Shubhendu >>>>> Thanks, >>>>> >>>>> Ryan >>>>> >>>>> _______________________________________________ >>>>> Users mailing list >>>>> Users(a)ovirt.org >>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>> >>>> _______________________________________________ >>>> Users mailing list >>>> Users(a)ovirt.org >>>> http://lists.ovirt.org/mailman/listinfo/users >>>> >>> _______________________________________________ >>> Users mailing list >>> Users(a)ovirt.org >>> http://lists.ovirt.org/mailman/listinfo/users >> >> _______________________________________________ >> Users mailing list >> Users(a)ovirt.org >> http://lists.ovirt.org/mailman/listinfo/users >