I would like to hear from anyone with real experience, success or failure.
We have a single Vmware 5.0 host with a large amount of storage on a single Linux virtual server, currently around 2TB and could go up to 12TB. Other VMs too, but this is the big one. I'm trying to come up with a backup mechanism, keeping cost down, but which will do the job. The users are processing satellite image data, using various FOSS software. They can stand extended backup and restore windows -- e.g., if it takes 10-20 hours to do a full backup on the weekend, that would be OK. File/directory level restores will be the norm, and if that takes a few hours, that'sl OK, too. The 12 TB is an internal RAID 5 LUN with an Adaptec controller & 7 x 2TB 7200rpm SAS disks.
Since I need file-level recovery, VADP type backups don't support that for all OSes and filesystems. So, I'm considering a conventional setup with a Networker 7.6sp3 or newer client on the Linux VM and another VM will be the storage node. The Storage Node will use VmDirectPath to connect to a tape system (like a Quantum Superloader 3) with a SAS 6Gbps LTO5 tape drive. 16 LTO5 tapes at 3TB per tape should handle a full backup. The client & storage node will communicate over the VMware virtual switch, internal to the Vmware host. We already have Networker here, & I can use the existing Backup Server to conrol this subsystem.
2 Major concerns:
Doing some searching & reading, it seems there might be problems with VmDirectPath access between the storage note & system. If anyone has any direct experience & can tell me something that does or does not work, I would appreciate it.
And, I'm banking on very high performance for the network traffic between the client and storage node, since it will never hit a wire, but be entirely on the virtual switch inside the Vmware Esxi 5.0 host. Vmware says that's supposed to be rather higher bandwidth than a physical Gigabit Ethernet switch. Seems plausible, I'm hopeful. But I could be wrong/disappointed.
I can use an existing tape autoloader to test with, Just need to get a SAS HBA (PciE) -- any recommendations or warnings?