Date: Sat, 15 Aug 2009 20:58:09 +0200 From: Ben Stuyts <ben@altesco.nl> To: Jeff Richards <bsd24x7@yahoo.com> Cc: freebsd-stable@freebsd.org Subject: Re: Multiple USB drives stability question Message-ID: <63A0E7D3-5AA2-440A-A771-CD8100FC97A0@altesco.nl> In-Reply-To: <558655.92355.qm@web110104.mail.gq1.yahoo.com> References: <558655.92355.qm@web110104.mail.gq1.yahoo.com>
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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
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