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6 To HD ?
12-02-2014, 09:10 AM
Post: #11
RE: 6 To HD ?
There is a post about larger disks

http://support.drobo.com/app/answers/detail/a_id/506/

What I am not sure of is that the post states the 5D can do "Drobo 5D: 32TB" but the dashboard would only let me create a 16TB partition??

I just bought 3x6TB disks, will add them with 2x2TB disks should be an actual size of 20TB with 14.5TB of usable space??? will update with results.
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12-03-2014, 12:43 PM (This post was last modified: 12-03-2014 12:44 PM by Paul.)
Post: #12
RE: 6 To HD ?
hi, i believe it means that the 5d can support 32tb's MAX of total usual advertised drive capacity.
eg if a drive is being advertised as a 4tb drive, then you could have only 8 of them (slots and firmware permitting of course) Smile

so if dashboard has a 16tb volume/partition limit, then if you had enough drives/capacity installed in the drobo, id assume it would let you make another 16tb volume, for the remaining space.

simple math i'd use for single SDR redundancy mode, and 5 drives of 6tb is this:
= 4 drives of 6tb available for data = 24tb (x0.9 overheads) = about 21.6tb for actual data
= 2x 16tb volumes (though the 2nd volume would NOT actually have 16tb for you to reliably use, it would be less by general rule of thumb)

simple math i'd use for dual DDR redundancy mode, and 5 drives of 6tb is this:
= 3 drives of 6tb available for data = 18tb (x0.9 overheads) = about 16.2tb for actual data
= i think 2x 16tb volumes (though the 2nd volume would NOT actually have 16tb for you to reliably use, it would be a lot less by general rule of thumb)
edit, that approximate 0.2tb may or may not be enough to push it into needing a 2nd volume...

(btw i have XP home SP2, a Drobo v1 with 2x 1TB/2x 1.5TB WD greens, & a bkp Drobo v2 with the same + a DroboShare: unused)
& a DroboS v2 with 3xWD15EADS &2x1TB in DDR mode on win7, & a drobo5D (all usb)
  • btw i did a sustained (write) operation for about 6 hours, and got 13.2MB / sec ...objection? "sustained" :)
    (16.7MB/s on a v2 & 47-96MB/s drobo-s)
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12-03-2014, 08:42 PM
Post: #13
RE: 6 To HD ?
As posted in another thread...

The chassis supports 32TB of storage.

BeyondRAID only supports volumes of 16TB.

If you have a 5D with 5x6TB, you will have at least 2 volumes. 1 16TB volume and 1 ~8.5TB volume.

You cannot have a single volume on any Drobo device (5D, 5N, 800i, 800FS, 1200i) larger than 16TB.

i7 Mac Mini Server, 10.10
Drobo (Gen2), USB, 4x WD 4TB RED

Drobo (Gen3), USB3, 4X WD 4TB RED

Drobo 5D, TB, 5x WD 4TB RED, 120GB Intel 525 mSATA SSD
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