SnapMirror TDP too slow

[delgiglioli]

Hi gurus,

I'm transferring a 6TB encrypted 7-mode volume to a C-Dot storage on AWS and transfer speed is about 2.4MB per minute.

Can the encryption impact this transfer? Is there any flag or option to increase this speed?

Any suggestion?

Thank you!

[vittal]

Hi delgiglioli,

please check if there is any throttle set in on source or destination controller. if enable try disabling the throttle and check.

C-mode::options rep* 

7mode: options replication.throttle.enable

Also You can configure a TCP window size for SnapMirror relationships between the 7-Mode volume and the ONTAP volume to improve the SnapMirror transfer throughput so that the replication operations are completed faster.

please refer : https://docs.netapp.com/ontap-9/index.jsp?topic=%2Fcom.netapp.doc.dot-7mdt-sm%2FGUID-5A8B1B88-B60B-465E-B22E-D6432B063210.html

[delgiglioli]

Thanks. I already did all of that.

I don't know what's going on. 

[TMACMD]

Have you considered a traceroute from the 7-mode to the destination IP? Maybe you are hitting a network link in the process that you do not realize?

Have you considered a packet-trace from both sides? Maybe there are errors being generated someplace (retransmits, etc)

[delgiglioli]

Traceroute is ok. No latency.

[TMACMD]

Packet-trace. see what's going on.

[delgiglioli]

Wed May  8 18:50:29 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 56 packets seen, 0 dropped, 65534 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:50:52 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 114 packets seen, 0 dropped, 131362 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:51:10 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 169 packets seen, 0 dropped, 196994 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:51:34 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 224 packets seen, 0 dropped, 262528 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:51:48 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 255 packets seen, 0 dropped, 295638 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:52:07 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 283 packets seen, 0 dropped, 328356 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:52:21 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 340 packets seen, 0 dropped, 393988 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:52:37 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 659 packets seen, 0 dropped, 869990 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:52:55 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 687 packets seen, 0 dropped, 904238 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:53:17 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 714 packets seen, 0 dropped, 936956 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:53:29 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 738 packets seen, 0 dropped, 969380 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:53:42 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1335 packets seen, 0 dropped, 1860250 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:53:56 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1364 packets seen, 0 dropped, 1893164 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:54:10 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1393 packets seen, 0 dropped, 1926078 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:54:30 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1420 packets seen, 0 dropped, 1958796 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:54:45 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1449 packets seen, 0 dropped, 1991710 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:54:56 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1479 packets seen, 0 dropped, 2024624 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:55:09 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1506 packets seen, 0 dropped, 2057342 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:55:23 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1536 packets seen, 0 dropped, 2090354 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:55:37 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1562 packets seen, 0 dropped, 2122974 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:55:48 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1593 packets seen, 0 dropped, 2156084 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:56:11 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1647 packets seen, 0 dropped, 2221618 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:56:28 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 1675 packets seen, 0 dropped, 2254434 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:56:38 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 2454 packets seen, 0 dropped, 3437712 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:56:58 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3271 packets seen, 0 dropped, 4664810 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:57:16 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3301 packets seen, 0 dropped, 4697822 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:57:33 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3330 packets seen, 0 dropped, 4730736 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:57:43 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3363 packets seen, 0 dropped, 4764042 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:57:58 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3394 packets seen, 0 dropped, 4797152 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:58:08 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3424 packets seen, 0 dropped, 4830164 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:58:20 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3454 packets seen, 0 dropped, 4863176 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:58:32 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3481 packets seen, 0 dropped, 4895894 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:58:43 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3506 packets seen, 0 dropped, 4928416 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:59:03 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3535 packets seen, 0 dropped, 4961330 bytes written to /etc/crash/vif10-303_20190508_185008.trc. 

Wed May  8 18:59:17 GMT [ams1encrnetapp1a:cmds.pktt.write.info:info]: pktt: 3561 packets seen, 0 dropped, 4993950 bytes written to /etc/crash/vif10-303_20190508_185008.trc.

[TMACMD]

Ok, well, while a snapmirror is in progress, get a packet trace on the source and another on the destination. Have someone in your networking group who is able to view/understand packet-traces look for anomolies. Additionally, if you open a case with NetApp, they will likely ask for something similar.