Multiple USB drives stability question

[Ben Stuyts]

Jeff,

On 15 aug 2009, at 05:04, Jeff Richards wrote:

> (da6:umass-sim6:6:0:0): SYNCHRONIZE CACHE(10). CDB: 35 0 0 0 0 0 0 0  
> 0 0
...

I've had lots of stability issues with USB drives until I added some  
quirks to prevent the SYNCHRONIZE CACHE from happening. For example:

Index: cam/scsi/scsi_da.c
===================================================================
RCS file: /usr/ncvs/src/sys/cam/scsi/scsi_da.c,v
retrieving revision 1.224.2.6
diff -r1.224.2.6 scsi_da.c
539a540,547
 > 		 * LaCie external 250GB Hard drive designed by Porsche
 > 		 * PR: usb/121474
 > 		 */
 > 		{T_DIRECT, SIP_MEDIA_FIXED, "SAMSUNG", "HM250JI", "*"},
 > 		/*quirks*/ DA_Q_NO_SYNC_CACHE
 > 	},
 > 	{
 > 		/*

You might try that, and see if it improves your situation.

Ben