I forgot to mention ubuntu version and linux kernel details. The storage box is running ubuntu server 14.10 with a more recent kernel. Kernel info: Linux storage1 3.19.0-031900-generic #201502091451 SMP Mon Feb 9 14:52:52 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux On Thu, Mar 12, 2015 at 5:05 PM, Govindarajan <govind.rajan@xxxxxxxxx> wrote: > Hi, > I have been using LIO target connected to 4 ESXi hosts for testing > purposes. On the ESXi hosts I have a total of about 30 virtual > machines. Whenever I run heavy IO workload in the VMs for some tests > ESXi seems to flip-flop between marking the iscsi connection online > and offline. This can be seen in the log snippet given at the bottom. > > A brief note about the set up. > > Ubuntu installed on a supermicro box. > 8 x 3TB disks in raid10 /dev/md0 > 4 x 480GB SSD raid10 /dev/md1 > bcache0 created out of /dev/md0 and /dev/md1 (cache) > LVMs created on top of bcache0 > 10 Gbps Intel 82599ES NIC > 10 Gbps on all ESXi hosts for iscsi portgroups > switch(dell powerconnect), esxi, and linux enabled for jumbo frames > > Every time I see the connection flap in ESXi I see a lot of task > aborts being sent by lio target. I have looked around in the mailing > list archives but I am not able understand the root cause of the > problem. If I restart target service, things are back in order until I > run heavy IO again. I have taken care of switch related settings as > per Dell's whitepaper meant for ESXi best practices. > > Today I increased the MaxConnections param to 2, not sure if it would help. > > Any clues are welcome that could help me root cause and solve this > issue. Please do let me know if you need any other log files from > either the linux storage box or the esxi hosts, I'll pull them out for > you. > > Thanks, > Govind > > > > targetcli output -- To unsubscribe from this list: send the line "unsubscribe target-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
