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November 30th, 2016 12:00
VNX Snaphots - Multiple CG or use SnapView
We have been using our VNX with FC mounted LUNs for a Linux file server for a couple of years now. We also have a VM which manages to keep 4 snapshots available in rotation for quick recovery during the day. The LUNs were added to a snapshot consistency group.
We have a new requirement to keep a single snapshot open for backup to disk or tape, even if that takes a couple of days to complete. This is to cover a worst-case scenario of losing the server and the VNX.
For this new backup process, can I create a second SCG with the same source LUNs? I would like to keep the 4 daily rotation SCG unmodified if possible. If not, can I create SnapView snaps alongside this SCG? Let me know if this is not clear.
dynamox
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December 1st, 2016 05:00
oh i see. So back to your original requirement. Using the same CG what's stopping your from creating a "dedicated" backup snapshot that will be used specifically for that purpose. Name is differently and manage it naviseccli.
dynamox
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November 30th, 2016 14:00
one source LUN can only belong to one CG. If you are snapping one LUN, why do you need to use CG ? CG is good if you need to snap multiple LUNs at the same time (database for example)
mlott-gie.com
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November 30th, 2016 14:00
We have a CG because there are about 7 or 8 LUNs for this file server. It appears that I cannot create a snapshot outside of the existing CG, so...
dynamox
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November 30th, 2016 18:00
what do you mean you cannot create a snapshot outside of a CG ?
mlott-gie.com
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December 1st, 2016 04:00
Working from naviseccli, I get the following error:
naviseccli -Address VNXADDRESS -secfilepath /root snap -create -res 110 -resType LUN -name testsnap1 -descr clisnap -keepFor 1h -allowreadwrite no
Snapshot creation is not allowed because the source LUN belongs to a consistency group. You must create snapshot on the entire consistency group. (0x716d8057)
mlott-gie.com
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December 1st, 2016 05:00
I suppose that is what I will have to do. It shouldn't be too difficult. We have a fancy wrapper script with command line switches to manage snapshot rotation and lun mounting and un-mounting so that we keep the snaps available for recovery. It has worked fairly well for the last couple of years. A similar version works on our DR VNX to do nightly snapshots, keeping two available at all times.
I'll try adding a name check so that it leaves the new daily snap alone.
mlott-gie.com
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December 9th, 2016 05:00
I was able to add simple filtering by snapshot name in our scripts. The script that cycles 4 snaps per day doesn't affect the snapshot taken for a full backup and vice versa. Thanks for the push.
dynamox
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December 9th, 2016 08:00
very good.