I’m hoping someone here has an insight or has experienced the same issue could chime in.
Here’s the scenario:
We recently deployed a new storage setup consisting of the DroboPro and an Intel Xserve (6 CPU Nehalem, 6GB RAM) for file sharing.
So we put the new hardware in and decided to connect the DroboPro via iSCSI to the Xserve. It took many, many hours migrating their data from the old RAID to the DroboPro (had to copy the data to a FireWire 800 drive first, then to the Drobo). During this time the Drobo was rock solid and I was impressed with its performance. Satisfied, I decided to deploy the new solution and turned on AFP and SMB file sharing services to roughly 20 users, mostly on Macs.
Within a few days of the server deployment, a user called and said she had problems connecting to the server. I was able to VNC into the server and discovered the Drobo had disappeared from the system; Drobo Dashboard said “no drobos detected” even though the Drobo icon was on the desktop. tried to navigate the Drobo’s file structure and was greeted by the spinning beachball of doom.
Thought the issue was odd, so I tried to soft restart the server. No dice; the server hung presumably because it was trying to unmount the drobo that was no longer there. I had to hard reboot the Xserve. When the reboot finished, the Drobo reappeared on the desktop and the Dashboard showed its presence. Over the course of the next week, the same thing happened; after a day or so (or on the monday following the weekend) the drobo would disappear from the system and I had to hard reboot.
Switching over to FW 800, although slower, showed that the Drobo was rock solid; when on iSCSI, random disconnects happened with regularity.
I’ve tried different Ethernet cables, , disabling disk spindown, moving the Drobo from the iSCSI switch and connecting it directly to the Xserve’s onboard Intel ethernet, and even replaced the Drobo with another refurb Drobo running the latest 1.1.11 firmware (the other Drobo was on 1.1.5). Same issue occurred with both Drobos. The only things that remained the same were the OS (server 10.6.4), the Drobo dashboard version (1.7.3), and the 8 hard drives in the Drobo (WD RE4 2TB). Everything is connected to an APC rackmount UPS. I’ve already attempted to uninstall and reinstall the Dashboard with the same result.
I suspect there’s an issue with the Drobo’s iSCSI stack. I’m going to reboot the Xserve in 32-bit kernel mode to see if the disconnects go away.
Shortly after the first Drobo started disconnecting itself, I also brought Atto Xtend San to use with an Infortrend iSCSI unit; so far that setup has been rock solid.
I’ve already opened up a support case but was wondering if anyone had a similiar issue. Thanks in advance for any insights.