DASCache crashed the volume

Hello

We use SanDisk DASCache on our new PowerEdge R530 to accelerate a RAID5 Volume using two SSDs forming a cache SSD RAID 1. Last night, around 5 o ' clock a.m., cache became suddenly unavailable, leaving the volume accelerated in an unreachable state. This volume, we welcomed three virtual servers, among them our primary DC, so it was a real critical incident. As we have been unable to get a useful support from DELL, SanDisk, the only opportunity we saw was to unlock and reformat the volume and then restore the virtual machines of our backup weekly. The servers are now up, but we are still busy cleaning up the mess. For the moment, we have disabled SanDisk DASCache.

Does anyone has done similar experiences with SANDisk DASCache in PowerEdge servers? DASCache 1.1.1 version number suggests that the product would not be in the State of reliability which would be desirable for production environments.

Thanks for your comments and responses.

Bernd

OK, we got comments from Dell. Source of the disaster seems to be a communication problem between the PERC raid controller and the SSD by Lite-on which, under certain conditions, translates as the controller of the two SSD power off. DAS Cache somehow this notice and takes the cache offline, without further notice. There is an update of the firmware for the PERC controller, which, according to DELL, could prevent the problem is recurring. An another firmware for the Lite-ON SSD firmware update is scheduled to be released in April 2015. We decided to let the software SanDisk DasCache disabled until the two firmware updates are available and installed.

Tags: Dell Servers

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