Removal of Hard Drive Causes Dashboard to show Error

Drobo - End of Sale Drobo FS
1

I needed to a disk to replace a failed drive in an iMac and as I had 7GB free on my Drobo I though I could remove one to the five 2TB disks
I followed the instructions about removing capacity on http://dashboardhelp.drobo.com/guide/210/en/FS_Removing_Capacity_or_Drives.htm

My Drobo FS is set for single drive redundancy.

Firmware - 1.2.7 [4.45.10288]

Usage (After removal of 2TB Drive)
Used - 3.33 TB (62%)
Free - 2.07 TB (38%)
Total - 5.41 TB

Current Disk Slot Usage

1 2TB (Green)
2 2TB (Green)
3 2TB (Green)
4 2TB (Green)
5 ‘Add a drive’ (Red)

After removing the 2TB drive from Bay 5, The capacity and free space dropped to the values above which is more than the drop I was expecting i.e. down from 7TB free to 2TB free???

Both the physical device and the dashboard are displaying a red light for bay 5 and the dashboard is telling me that the “Drobo cannot protect your data against hard drive failures until you provide at least 2 hard drives for single disk redundancy or 3 hard drives for dual disk redundancy. Insert a new hard drive into the empty drive bay indicated by the red light to enable Drobo to protect your data against hard drive failures.”

As there are still 4 healthy 2TB drives installed, this message worries me :frowning:

Can you please advise if there is something I should be doing to get the drobo back on a healthy status

Thanks in advance
Stephen

2

hi, for the free space part…

if you started out with five 5tb drives, in SDR mode
then usually you would end up with the size of 1 of them being used up for SDR, (eg the largest drive)
so that would give you 2+2+2+2 = 8tb of raw capacity.
usually the operating system takes up a bit of space, so *0.9 = about 7.2tb free

then if you removed one of the 2tb drives (or if one failed etc)
then that gave you the following:
2+2+2 = 6tb raw capacity (because sdr needs the size of your largest drive for protection, so 8tb - 2tb = 6tb.
*0.9 = 5.4tb approx.

so if you had about 3.3tb used for data then the free space of about 2tb sounds ok.
(hopefully this helps a bit to explain)

for the other part,
if you wait a while, does the drobo start flashing yellow and green lights and did it flash any lights earlier?