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comment Troubleshooting latency spikes on ESXi NFS datastores
I can reproduce this problem on an untagged port as well, no VLANs involved on that host at all.
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comment Troubleshooting latency spikes on ESXi NFS datastores
Yes, of course I'm using tagged VLANs. As I'm using them everywhere I didn't even think of them as a potential source of this problem. I am going to try to reproduce this on an untagged port.
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accepted Troubleshooting latency spikes on ESXi NFS datastores
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answered Troubleshooting latency spikes on ESXi NFS datastores
Jul
31
revised Troubleshooting latency spikes on ESXi NFS datastores
added new ESXi build
Jul
12
comment Troubleshooting latency spikes on ESXi NFS datastores
IPv6 was already disabled on the ESXi host. I've disabled IPv6 on the NFS server (ifconfig -a6 is empty now), but it doesn't make a difference: It shows the same problems.
Jul
9
comment Troubleshooting latency spikes on ESXi NFS datastores
The last tests were done on a vSwitch only, no physical network involved (e1000 and vmxnet3: made no difference). But I've also tested this on Intel 82574L, Intel 82576 and Intel 82567LF-3, all showing the problem. I did not find any hardware yet where I can't reproduce this.
Jul
9
comment Troubleshooting latency spikes on ESXi NFS datastores
I tried setting nfs:nfs3_max_transfer_size, nfs:nfs3_max_transfer_size_cots and nfs:nfs3_bsize all down to 8192: No difference, same problems. The linux guests just use their SCSI/SAS-disks, no NFS - the ESXi is the NFS-client, therefore no network driver issue on the linux guest. On the NFS server side I've tried both virtual e1000 and vmxnet3: Made no difference. As far as I know ESXi only uses TCP offloading for iSCSI.
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Jul
7
revised Troubleshooting latency spikes on ESXi NFS datastores
Added NexentaStor test
Jul
7
comment Troubleshooting latency spikes on ESXi NFS datastores
@Ryan: I've uploaded the capture file. I've also uploaded the nfsstat output.
Jul
7
revised Troubleshooting latency spikes on ESXi NFS datastores
Added tcpdump capture
Jul
6
comment ghettoVCB issue
Are you sure you did not run this backup a second time, while the first one was still running? The timestamps don't make sense: 2010-03-20 00:46:20 -- info: Removing snapshot from vm1 ... [...] 2010-03-19 23:51:19 -- info: Removing snapshot from vm1 ...