On 11/13/2014 10:17 AM, David Moreau Simard wrote: > Running into weird issues here as well in a test environment. I don't have a solution either but perhaps we can find some things in common.. > > Setup in a nutshell: > - Ceph cluster: Ubuntu 14.04, Kernel 3.16.7, Ceph 0.87-1 (OSDs with separate public/cluster network in 10 Gbps) > - iSCSI Proxy node (targetcli/LIO): Ubuntu 14.04, Kernel 3.16.7, Ceph 0.87-1 (10 Gbps) > - Client node: Ubuntu 12.04, Kernel 3.11 (10 Gbps) > > Relevant cluster config: Writeback cache tiering with NVME PCI-E cards (2 replica) in front of a erasure coded pool (k=3,m=2) backed by spindles. > > I'm following the instructions here: http://www.hastexo.com/resources/hints-and-kinks/turning-ceph-rbd-images-san-storage-devices > No issues with creating and mapping a 100GB RBD image and then creating the target. > > I'm interested in finding out the overhead/performance impact of re-exporting through iSCSI so the idea is to run benchmarks. > Here's a fio test I'm trying to run on the client node on the mounted iscsi device: > fio --name=writefile --size=100G --filesize=100G --filename=/dev/sdu --bs=1M --nrfiles=1 --direct=1 --sync=0 --randrepeat=0 --rw=write --refill_buffers --end_fsync=1 --iodepth=200 --ioengine=libaio > > The benchmark will eventually hang towards the end of the test for some long seconds before completing. > On the proxy node, the kernel complains with iscsi portal login timeout: http://pastebin.com/Q49UnTPr and I also see irqbalance errors in syslog: http://pastebin.com/AiRTWDwR > You are hitting a different issue. German Anders is most likely correct and you hit the rbd hang. That then caused the iscsi/scsi command to timeout which caused the scsi error handler to run. In your logs we see the LIO error handler has received a task abort from the initiator and that timed out which caused the escalation (iscsi portal login related messages). _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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