Sandeep Agarwal

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Sandeep Agarwal

Symantec Employee

Member for: 2 years 32 weeks
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Member for: 2 years 32 weeks

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discussion comment 07 Nov 2009

Sandeep Agarwal commented on: Veritas Cluster Server

Actually the private interconnect's physical connections can be changed 1 at a time without having to bring any of the cluster nodes down. JUst add a switch and remove 1 of the private interconnect links from both the nodes and connect that ...

New blog entry 26 Oct 2009

Sandeep Agarwal posted: LLT Checksums

Recently we got an escalation from the field on AIX in which we saw that gab paniced the node because it got a packet with a wrong sequence number. On further debugging we found that everything was correct except that 1 bit in the gab sequence number was flipped from 0 to 1 thus causing gab to pan

discussion comment 20 Oct 2009

Sandeep Agarwal commented on: Heartbeat low priority link

Say you want to add qfe2 to llt as a low-pri link2 : lltconfig -l -t link2 -d /dev/qfe:2 -b ether

New article 20 Oct 2009

Sandeep Agarwal posted: LLT peerinact tunable consideration for AIX

Here is a link to an article which talks about increasing the llt_peerinact timeout to be 32s instead of the default 16s for AIX: http://seer.entsupport.symantec.com/docs/282024.htm (Storage and Clustering, Cluster Server, Best Practice) () Symantec, Cluster Server, Best Prac

discussion comment 28 Sep 2009

Sandeep Agarwal commented on: LLT WARNING V-14-1-10498 recvarpreq cross links?

The best way to test that you don't have cross-links is by plumbing an IP address on link0 of node1 and link1 of node2 and pinging. If you get a response then you know that the links are crossed and the above message is correct.

New blog entry 10 Sep 2009

Sandeep Agarwal posted: Low Latency Transport Suggestions

If you want to reduce extra traffic on the LLT links one small thing to do would be to add the following line to /etc/llttab on all the nodes in your cluster (say 2 node cluster): exclude 2-31 What the above line does is that it assumes that your cluster will always have only 2 nodes (0 and

discussion comment 07 Aug 2009

sandeep_agarwal2@symantec.com commented on: VCS + VVR + IPMP - Source IP address is wrong

Yes, you can. If that's acceptable that should solve your problem.

discussion comment 06 Aug 2009

sandeep_agarwal2@symantec.com commented on: VCS + VVR + IPMP - Source IP address is wrong

Can you paste your IPMP config from the sec site? Are you using the deprecated flag on the IPMP test addresses?

New blog entry 26 Jul 2009

Sandeep Agarwal posted: LLT over vlanned trunks on Solaris

It seems that some customers want to create a trunk out of two links and then create vlans over that trunk and then run LLT over those two vlans. This is how to do this on Solaris: Create a trunk (aggregation first) out of the two bge links: dladm create-aggr -d bge2 -d bge3 1 <--

New blog entry 16 Jul 2009

Sandeep Agarwal posted: LLT on Solaris - common ce driver tunable

If you have LLT working over the ce driver on Solaris, one small change that you can make to help performance problems in your cluster would be the following: The /etc/system file on all hosts should have: set ce:ce_no_tx_lb=1 set ce:ce_taskq_disable=1 set ce:ce_reclaim_pending=1 A r

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