Hi everyone. Hope someone can help.
I own an original Drobo 4-bay and it’s been serving me fairly well for years now. Recently I’ve noticed considerable slow down with write & read speeds that is making it almost unusable.
Currently packed with 4x WD Green 2TB from late 2012, single volume thin provisioned past actual physical storage capacity.
Drobo is connected via FW800 to MacBook Pro 2013. Also tested with 2008 iMac (this was its primary connection for years before upgrade to MBP. Behavior is same on both machines, and USB2 as well as FW800)
I’ve noticed slowdown for a while now (few months) but it’s becoming painfully apparently this week as I’m trying to move a large amount of data from the drobo to a NAS unit. I’ve tested the NAS (Synology 1-bay with enterprise class WD drive) and it’s read / write speeds are a consistent 40-50MBs from all sources except Drobo.
While copying files from the Drobo, however (either to the NAS or to the directly attached computers), some files will transfer at acceptable speeds (~20+MBs) while some slow to a crawl, maxing out at 2-5MBs. The bulk of these files are 4-7GB video files which I’ve collected over the years. Some transfer in as little as 3-5 minutes, some take half an hour. The slowdown behavior is limited to certain files, and seems to occur more often with files that have been on the drive longer - although this is just conjecture and may not be entirely the case.
The behavior makes me believe that one or more of the individual drives may be experiencing considerable slowdown with any files residing on it. However, Drobo has never alerted me to any problems with the drives or need to replace.
I also tried running Disk Warrior on the Drobo (from both computers, and from a USB-bootable copy of Disk Warrior on an external) and each time it gives me an error that said it was unable to correct directory structure due to too many hardware errors. Again - reinforcing the faulty drive hypothesis.
Does anyone have any ideas on what I can do? Is there any way to test the individual drives while maintaining the integrity of the data so it can be read when re-inserted in the Drobo? I have access to a PC running Win 8 as well, so solutions do not have to be Mac Based.
I’m not opposed to replacing drives in the Drobo, but currently I have no way of knowing which drive is causing the issue - or if that even is the issue.
Hope someone is able to help. Sorry for the wall of text. Thanks if you’ve made it this far.