October 24, 201312 yr I use a great syncing utility on Windows called FreeFileSync (FFS). However, many times when I'm doing heavy reads (not writes as far as I can see), the drive being read is knocked offline ("missing") and I need to reboot the unraid server. Then the drive comes back (no harm done), I start the Array and everything is back to normal again. I have to do this all the time. Interestingly, I never have this issue using Windows ( file copying, only with FFS. Perhaps it's an FFS issue, perhaps it's a hardware issue, perhaps it's an Unraid OS issue. I'm stumped. Any ideas? Hitachi Green 3TB HDD -> HP SAS Expander -> SuperMicro MV8 Raid Controller -> SuperMicro motherboard. Unraid 5.0-rc10. (Full details in my signature). Thanks.
October 30, 201312 yr Author Really bad news... I upgraded to the latest 5.0 release as you suggested (and also to the RC16 after the 5.0 failed), and in both cases the server wouldn't boot up at all (see attachments). Seems to be a hardware issue, BUT, going back to RC10 works fine (other than the original issue where a drive would be knocked offline during heavy reads). Any help would be greatly appreciated (to confirm if it's a hardware issue or whatever). Note: I've been trawling the 5.0 release thread and others for a few hours, and no one seems to have posted any similar issue. Thanks.
October 30, 201312 yr Author Yes absolutely. I tried the "official" way by reformatting the flash drive, and I also tried the advice on the forums (copying over the bz*, readme.txt and syslinux.cfg files). Exact same behaviour in all cases. A few thoughts... 1) it seems like some change was added between RC10 and RC16, so it would be good if I could download each version of the OS and try each step-by-step -- however, I can only find RC16 available for download; 2) I should read the release notes for each RC10+ version and see if it tells me what change might have been introduced; 3) Should I be posting this issue to a more official forum to get support directly from Tom et al? I only ask because in the 2.5 years I've been running UNRAID, this is the only time I've had such a deal-breaker type problem. Thanks.
October 31, 201312 yr Author My thoughts exactly ... I'll start ripping out hardware and try booting the new OS version until I find the troublesome component ... thanks !!
November 19, 201312 yr Author UPDATE: removed HP SAS expander and used a combination of 2 x MV-SAS cards + Motherboard SATA ports instead, and all problems went away. Seems as though the HP card is faulty. The problem with heavy reads knocking drives offline seems to have gone away as well.
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