Does Infoscale Storage (VVR) support cascaded space-optimized snapshot?

Question

Configuration: Infoscale Storage 8.0 on Linux

Infoscale storage foundation supports cascaded snapshot using vxsnap infrontof= to do cascaded snapshots

Infoscale storage (with Volume replicator) documentation doesn't describe cascaded snapshot.
I checked manpage for vxrvg. Does not have an infront of attribute.
Does that mean cascaded space-optimized snapshots are not supported/permitted on RVG?

sdighe1 · Answer

Hi Martin,The option is expected to work on VVR deployments too. Just that specific documentation is not done because the infrontof option is not VVR specific. You can the same on your lab. I did try out in my system, and working fine.vradmin -g dg1 repstatus myrvgReplicated Data Set: myrvgPrimary:&nbsp; Host name:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 192.168.20.93&nbsp; RVG name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myrvg&nbsp; DG name:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; dg1&nbsp; RVG state:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; enabled for I/O&nbsp; RVG encrypted:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; No&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; srlvol&nbsp; SRL size: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1.00 T&nbsp; Total secondaries:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 1Secondary:&nbsp; Host name:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 192.168.20.94&nbsp; RVG name: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; myrvg&nbsp; DG name:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; dg1&nbsp; Data status:&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; consistent, up-to-date&nbsp; Replication status: &nbsp; &nbsp; &nbsp; &nbsp; replicating (connected)&nbsp; Current mode: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; N/A&nbsp; Logging to: &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; SRL&nbsp; Timestamp Information:&nbsp; &nbsp; &nbsp; behind by&nbsp; 0h 0m 0sCreated few snapshotsvxsnap -g dg1 make source=vol1/new=vol1_snap1/cachesize=100gvxsnap -g dg1 make source=vol1/new=vol1_snap2/cache=vol1_snap1-C01/infrontof=vol1_snap1vxsnap -g dg1 make source=vol1/new=vol1_snap3/cache=vol1_snap1-C01/infrontof=vol1_snap2vxsnap -g dg1 make source=vol1/new=vol1_snap4/cache=vol1_snap1-C01/infrontof=vol1_snap3vxsnap -g dg1 listNAME&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; DG &nbsp; &nbsp; &nbsp; &nbsp; OBJTYPE SNAPTYPE PARENT &nbsp; &nbsp; PARENTDG &nbsp; SNAPDATEvol1&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; vol &nbsp; &nbsp; -&nbsp; &nbsp; &nbsp; &nbsp; -&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; - -&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;vol1_snap1&nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; vol &nbsp; &nbsp; spaceopt vol1 &nbsp; &nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; 2023/05/30 07:18vol1_snap2&nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; vol &nbsp; &nbsp; spaceopt vol1 &nbsp; &nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; 2023/05/30 07:18vol1_snap3&nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; vol &nbsp; &nbsp; spaceopt vol1 &nbsp; &nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; 2023/05/30 07:18vol1_snap4&nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; vol &nbsp; &nbsp; spaceopt vol1 &nbsp; &nbsp; &nbsp; dg1&nbsp; &nbsp; &nbsp; &nbsp; 2023/05/30 07:19&nbsp;vxsnap -g dg1 printNAME&nbsp; &nbsp; SNAPOBJECT&nbsp; &nbsp; TYPE&nbsp; &nbsp; PARENT&nbsp; &nbsp; SNAPSHOT&nbsp; &nbsp; %DIRTY&nbsp; &nbsp; %VALIDvol1 &nbsp; &nbsp; -- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; volume &nbsp; -- &nbsp; &nbsp; &nbsp; -- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -- &nbsp; &nbsp; &nbsp; 100.00vol1_snap1_snp&nbsp; volume &nbsp; -- &nbsp; &nbsp; &nbsp; vol1_snap1 &nbsp; 0.00 &nbsp; &nbsp; -- &nbsp; &nbsp;vol1_snap2_snp&nbsp; volume &nbsp; -- &nbsp; &nbsp; &nbsp; vol1_snap2 &nbsp; 0.00 &nbsp; &nbsp; -- &nbsp; &nbsp;vol1_snap3_snp&nbsp; volume &nbsp; -- &nbsp; &nbsp; &nbsp; vol1_snap3 &nbsp; 0.00 &nbsp; &nbsp; -- &nbsp; &nbsp;vol1_snap4_snp&nbsp; volume &nbsp; -- &nbsp; &nbsp; &nbsp; vol1_snap4 &nbsp; 0.00 &nbsp; &nbsp; -- &nbsp; &nbsp;vol1_snap1 vol1_snp &nbsp; &nbsp; volume &nbsp; vol1 &nbsp; &nbsp; -- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.00 &nbsp; &nbsp; 0.00 &nbsp;vol1_snap2 vol1_snp1&nbsp; &nbsp; volume &nbsp; vol1 &nbsp; &nbsp; -- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.00 &nbsp; &nbsp; 0.00 &nbsp;vol1_snap3 vol1_snp2&nbsp; &nbsp; volume &nbsp; vol1 &nbsp; &nbsp; -- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.00 &nbsp; &nbsp; 0.00 &nbsp;vol1_snap4 vol1_snp3&nbsp; &nbsp; volume &nbsp; vol1 &nbsp; &nbsp; -- &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 0.00 &nbsp; &nbsp; 0.00 &nbsp;

martinfrancis · Answer

thanks for verifying that&nbsp; vxsnap option works with "infrontof" on VVR secondary volumes.So are you suggesting that:1) If I want to use cascaded snaps on VVR secondary I should use "vxsnap" command.In all other type of snaps (space optimized, instant full, plex breakoff) I should use vxrvg?2) Why doesn't vxrvg support "infrontof" attribute while it supports all other types of snap? [not just documentation, even the command vxrvg snapshot doesn't have an option for infrontof]3) If there is no difference between vxsnap snapshot and vxrvg snapshot, why does vxrvg snapshot command exist. So I am thinking what would I be missing if I use vxsnap snapshot command instead of vxrvg snapshot

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Does Infoscale Storage (VVR) support cascaded space-optimized snapshot?

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