Replication error

Question

Hi, I've 2 SAN Equalogic, one being used as storage for VM host and the other one is in mode standby in case of issue. Thers is a replication from SAN 1 to SAN 2 in one way. SInce 3 moths, I've this error message and I'm unable to fix it.  Thanks, Jimmy This message was generated by the Dell EqualLogic SAN HeadQuarters service (version 2.1.0.5342) running on VCENTER The following conditions on Group SAN2 (10.11.0.2) have generated an alert notification: Caution conditions: 23/05/2012 07:19:55 to 23/05/2012 08:21:55 Member SAN2 TCP retransmit percentage of 2,1%. If this trend persists for an hour or more, it may be indicative of a serious problem on the member, resulting in an email notification. TCP retransmit rate greater than 1% should be investigated. Check the network connections and switch settings. Condition already generated an e-mail message. If the condition persists, additional messages will be sent approximately every 6 hours. TCP outbound packet counts for polling period: 702 TCP retransmit packet counts for polling period: 15 eth0 send rate for polling period: <1.0 KB/sec eth1 send rate for polling period: <1.0 KB/sec eth2 send rate for polling period: <1.0 KB/sec 23/05/2012 02:13:55 to 23/05/2012 06:17:55 Member SAN2 TCP retransmit percentage of 2,1%. If this trend persists for an hour or more, it may be indicative of a serious problem on the member, resulting in an email notification. TCP retransmit rate greater than 1% should be investigated. Check the network connections and switch settings. Condition already generated an e-mail message. If the condition persists, additional messages will be sent approximately every 6 hours. TCP outbound packet counts for polling period: 698 TCP retransmit packet counts for polling period: 15 eth0 send rate for polling period: <1.0 KB/sec eth1 send rate for polling period: <1.0 KB/sec eth2 send rate for polling period: <1.0 KB/sec

JPHUNG · Answer

Hi Don, Indeed, it happens only during replication. Thanks

sketchy00 · Answer

Just to reinforce what Don is saying, recently we had a layer 1 issue with our fiber link to our target site we were replicating to, and it caused retransmit thresholds to be exceeded.  One the physical link was corrected, everything resumed and the retransmit rate went down to nearly zero.

JPHUNG · Answer

Hi Don, It isn't a WAN but LAN link and it seems it could be the fiber link between the 2 SAN. We keep in touch, Thanks, Jim

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