Check each and every virtual disk (one at a time obviously) and see if there's an option to bring the virtual disk online. If there is, select this.

Then see if the write cache will re-enable.

Thanks. All the virtual disks are online. Everything reports "normal".

But still no write cache I'm afraid...

OK - I've got more detail on the error through the email alerts generated...looks as though we still have a problem with disks 0 and 1...

Event 951 has occurred on storage system FCNPR052600097 for device Enclosure 0 Disk 0 at 01/26/10 09:00:18 The event description is: A disk drive CRU signature error occurred. A server may have lost access to virtual disks on that disk drive. See the AX-series troubleshooting documentation to resolve the error.

Event 951 has occurred on storage system FCNPR052600097 for device Enclosure 0 Disk 1 at 01/26/10 08:59:56 The event description is: A disk drive CRU signature error occurred. A server may have lost access to virtual disks on that disk drive. See the AX-series troubleshooting documentation to resolve the error.

You'll need to create a case with Dell|EMC support as those type of errors are either a real easy fix (bring an offline virtual disk online) or can take some work (seems more likely now, in your case).

Thanks again!

We've got a case open with Dell now - was rather hoping it wasn't anything too serious...hopes dashed!!!

Oh well...we shall persevere with it.

If/when Dell fix it, I'll post what was done.