On 02/11/2016 09:25 PM, Ewan Milne wrote: > On Mon, 2016-02-08 at 15:34 +0100, Hannes Reinecke wrote: >> Sending a 'REPORT TARGET PORT GROUP' command is a costly operation, >> as the array has to gather information about all ports. >> So instead of using RTPG to poll for a status update when a port >> is in transitioning we should be sending a TEST UNIT READY, and >> wait for the sense code to report success. > > Note that we may need to add a timeout on this somehow, I have > recently seen a bug report where an array stayed in the ALUA > transitioning state for an extremely long period of time. > > That problem would occur with either the current or this new > ALUA code, the question is whether we want to handle it better. > There already is provisioning in the code to set the port to STANDBY if the transitioning time is exceeded. Not that this code path is well tested, but it's there :-) Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
