dcm resynchronization does not start automatically

Question

Hi all:
I am testing the vcs/vvr cluster . When I write a data which size exceeds the srl volume size, VVR goes to "logging to dcm" state.&nbsp;
&nbsp;

&nbsp;# vradmin -g data_dg -l repstatus rvg_b
	Replicated Data Set: rvg_b
	Primary:
	&nbsp; Host name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;192.168.100.111
	&nbsp; RVG name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; rvg_b
	&nbsp; DG name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;data_dg
	&nbsp; RVG state: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;enabled for I/O
	&nbsp; Data volumes: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1
	&nbsp; VSets: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;0
	&nbsp; SRL name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; srl_b
	&nbsp; SRL size: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 150.00 M
	&nbsp; Total secondaries: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;1
	Secondary:
	&nbsp; Host name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;192.168.100.112
	&nbsp; RVG name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; rvg_b
	&nbsp; DG name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;data_dg
	&nbsp; Rlink from Primary: &nbsp; &nbsp; &nbsp; &nbsp; rlk_192.168.100.112_rvg_b
	&nbsp; Rlink to Primary: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; rlk_192.168.100.111_rvg_b
	&nbsp; Configured mode: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;asynchronous
	&nbsp; Latency protection: &nbsp; &nbsp; &nbsp; &nbsp; off
	&nbsp; SRL protection: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; autodcm
	&nbsp; Data status: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;consistent, behind
	&nbsp; Replication status: &nbsp; &nbsp; &nbsp; &nbsp; logging to DCM (needs dcm resynchronization)
	&nbsp; Current mode: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; asynchronous
	&nbsp; Logging to: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; DCM (contains &nbsp;5572672 &nbsp;Kbytes) (SRL protection logging)
	&nbsp; Timestamp Information: &nbsp; &nbsp; &nbsp;N/A
	&nbsp; Bandwidth Limit: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;100.00 Mbps
	&nbsp; Compression Mode: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; On

After writing, the vvr keeps in &nbsp;"needs dcm resync" &nbsp;status and the resynchronization does not start automatically. What should I set to let the resync start auto?
&nbsp;
Btw:another question. If a new write operation on block operation coming in when the block is in dcm resync state, is the write action blocked or not?&nbsp;

mikebounds · Answer

&nbsp;
When VVR catches up from SRL, the secondary is consistent as it is written on the secondary in the same order it was written on primary. &nbsp;With DCMs VVR cannot catch up consistently as it is just writing the dirty regions in the DCM with no write-order so as VVR can only catch up inconsistently using the DCMs maps, this is a manual operation, so you are aware your DR site will be inconsistent during the catch-up (so back-up of the DR site is recommended before you start DCM resync, just in case you loose primary during catch-up). &nbsp;To catch up use:
&nbsp;
vradmin -g dg_name resync rvg_name
&nbsp;
I don't believe there is anyway to automate this with VVR tools, but I would not recommend this anyway.
&nbsp;
During DCM resync, writes on primary still continue.
&nbsp;
Mike

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dcm resynchronization does not start automatically

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