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Gen 2 is 1 day per 1 TB storage. Quicker with newer models?
09-19-2016, 06:42 AM
Post: #1
Gen 2 is 1 day per 1 TB storage. Quicker with newer models?
I have a Drobo gen 2 (4 slot) connected to a Mac Mini with FireWire. The Drobo has 3x4TB and 1x2TB disks in it, so total of 9TB storage. When a disk has died and needed replacement, or I have upgraded from 2TB to 4TB, it has taken about 10 days to get back into protected mode. That is a lot of time for a RAID not to be in protective mode.

From what I've read on this forum, it's normal for a Drobo gen 2 to use about 1 day per 1 TB of storage, so that fits what I've seen.

Is a new version of the Drobo (4 slot) or the Drobo 5D quicker, or do they also require 1 day per 1 TB of storage before getting back into protective mode?

Thanks.
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09-19-2016, 05:08 PM
Post: #2
RE: Gen 2 is 1 day per 1 TB storage. Quicker with newer models?
hi dillemikk, you are right about 10 days being a long time.

as far as i know, some other models (or other models and configurations) have been able to complete rebuilds quicker. i do not know the basline formula or best configs for quickest times though, but i usually tend to stick with 1day per 1TB for my own drobo rebuild calculations.

(gen1, gen2, drobo-s-gen2 seem to be similar - i have not yet tried a rebuild with a 5d, but when current space gets low i will have to add another drive and will make a note to time it when i do for you.)

(other factors can also play a part, such as accessing files during a rebuild, which could happen directly from the user, or indirectly via application, indexing, virus scanning, autobackups etc)

(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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