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Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
12-30-2015, 01:04 PM
Post: #1
Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
I have a 4 bay 4x 4TB Drobo connected via FireWire. I decided to upgrade one drive to a 6TB and it is rebuilding saying 700hours remaining. According to calculations it should only take 24hrs/TB which equates to 6-7 days. What gives for this long of a process?!?! Is something wrong with my unit?
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12-30-2015, 01:11 PM
Post: #2
RE: Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
I just put in a 5TB in place of one of the 4x3TB I had. Rebuild time estimate started at 70 hours, and has now gone up to 114 hours, only one hour later.

Drobo V2 w/ 2x3TB WD EZRX Greens+2x5TB WD EFRX Red , second Drobo v2 with 2x3TB + 2x2TB (all WD Greens) on a Mac Mini i7 with Yosemite.
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12-30-2015, 04:16 PM
Post: #3
RE: Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
hi, yes the progress bar can fluctuate (similarly to the windows copy and paste progress bar)

the general rule of thumb under normal conditions is to allow about 1day per 1tb of data that you have on it.
however, if something is using it, it can also slow down.
for example, scheduled antvirus full system scans, windows or spotlight searching indexing, etc

(drobo could also become unavailable to dashboard or computer at certain points of the rebuild, but what you could do is to check that nothing else is activily using the drobo, and could possibly even shutdown the computer, but if you check it in the morning it may stabilise the progress bar a bit more)

(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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12-31-2015, 08:58 AM
Post: #4
RE: Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
So....on a side-note....this proves a Gen2 Drobo can in fact use drives larger than 4TB, correct?

Drobo (Gen2)
Drobo 5N
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12-31-2015, 09:09 AM
Post: #5
RE: Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
(12-31-2015 08:58 AM)AzDragonLord Wrote:  So....on a side-note....this proves a Gen2 Drobo can in fact use drives larger than 4TB, correct?

I guess it does. It seemed to take a while to recognize the new drive, but that was probably due to me being nervous that it wouldn't recognize it at all! I turned off all the things I could find that might access the drive (it's my media pool for Plex so an auto scan and update was going off regularly) and the data protection time is coming down now, at 110 hours half a day after starting the rebuild.

Drobo V2 w/ 2x3TB WD EZRX Greens+2x5TB WD EFRX Red , second Drobo v2 with 2x3TB + 2x2TB (all WD Greens) on a Mac Mini i7 with Yosemite.
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01-05-2016, 06:13 AM
Post: #6
RE: Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
IT'S DONE! First rebuild completed overnight, so that's morning of Dec 31st to early January 5th, so just shy of 5 full days, or 120 hours. I guess the initial 110 hours after half a day in Dashboard was pretty close. I gave it an hour or two to rest, and I've now replaced another 3TB WD Green with a 5TB WD Red at 7am. Updates to follow, it's saying 84 hours right now.

Drobo V2 w/ 2x3TB WD EZRX Greens+2x5TB WD EFRX Red , second Drobo v2 with 2x3TB + 2x2TB (all WD Greens) on a Mac Mini i7 with Yosemite.
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01-05-2016, 03:39 PM
Post: #7
RE: Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
cool spiney,
after that happens and settles down etc, it might be good to run a readonly chkdsk (disk warrior equivalent) just to see if all looks ok there too.

(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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01-05-2016, 05:29 PM
Post: #8
RE: Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
(01-05-2016 03:39 PM)Paul Wrote:  cool spiney,
after that happens and settles down etc, it might be good to run a readonly chkdsk (disk warrior equivalent) just to see if all looks ok there too.

I'll point Disk Utility at it (I'm on a Mac here).

Drobo V2 w/ 2x3TB WD EZRX Greens+2x5TB WD EFRX Red , second Drobo v2 with 2x3TB + 2x2TB (all WD Greens) on a Mac Mini i7 with Yosemite.
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01-06-2016, 12:15 PM
Post: #9
RE: Drobo Gen2 4bay FW taking 700 hours to rebuild one 6TB drive
ah yes, (btw i think it becomes cocktail in a future version)

(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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