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The consensus was generally to use the -icds option, and it sounds like it would work. But since these are live production servers I have a lot of testing to do in a VM before I attempt it. Even if it would work, it's still a lot of work and I am unsure how mdadm will complicate things.
If anyone has advice let me know.
If you are unaware of SSD over provisioning, google it. Short version: I need to shrink mdadm and XFS (impossible, so will take backup+restore of some sort) so that only 80% of the drive is addressable by the OS, leaving 20% over-provisioned. To make things more interesting, the only way to gain this on an existing formatted drive would to be to do an SSD Secure Erase after the backup, so that each block is "owned" by the SSD and not addressable by the OS, freeing it up. So that means I had better have a good backup!
If anyone has direct experience with this or cares to do some VM simulations for me let me know. Debian 7 wheezy on kernel 3.12.0, mdadm 3.2.5, (2) disk RAID 1:
Keep in mind that during all of this futures.io (formerly BMT) would be off-line, so I am looking for a compact/quick method. I can use a local server (NFS or SSH) to store the image at 1Gb link, so that will help.
Also I don't think I mentioned that the filesystem is XFS. Everything I am reading so far is only talking about raw file systems. The issue is when you add in mdadm it seems, not sure on this one...
And I had looked at xfsdump even before I started this thread, but just afraid to use it on something like / but I guess I will take a look and see if I can make it work in a VM.