I'm trying to determine how the virtual pool/provisioning works in the VMax. I've read multiple papers but it isn't providing me with the details I am looking for. I hope someone can explain this part to me.
Lets say I have a virtual pool of #100 400GB fibre drives. I choose Raid6 protection. I create #10 100GB luns/devices in this pool. Is each lun spread across all 100 physical drives in what is called extents (no thin devices in my config)? If so, does that mean if I lose 3 hard drives all 10 of my created luns are destroyed? Or is there some underlying component that has a protection at a physical drive level. Perhaps the array is aware of the 6+2 config and can protect the lun in ways that arent described in the papers I am reading.
Am I making any sense? If so, please shed some light on this for me or link me to a document that can describe this type of layout.
You will lose your data if 3 drives fail in one "raid group" (6+2). At 100 drives you can crate 12 "raid groups" (96 Disks) and each one group can lose two drives.
Your 400GB drives will have several TDAT devices created on them. These are protected in whatever fashion you want. Exaclty like you would do with hypers today.
Those TDAT devices are then added to a virtual pool and given a name.
Now when you create a thin device in the virtual pool it gets spread across the TDATs. As long as you dont lose multipe drives that make up a given TDAT(s) your data is protected.
KrivosheinAlexa
10 Posts
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Posted May 11th, 2010 00:00
You will lose your data if 3 drives fail in one "raid group" (6+2). At 100 drives you can crate 12 "raid groups" (96 Disks) and each one group can lose two drives.