On Mon, May 05, 2008 at 12:14:22PM -0700, info-dtnet wrote:
> 
> Hi,
> 
> while looking around in google, if found a logfile
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=467390, where the
> iscsi LUN cache is enabled, read+write:
> Feb 21 22:19:15 localhost kernel: sd 1:0:0:0: [sdc] Write cache:
> enabled, read
> cache: enabled, supports DPO and FUA
> 
> My dmsg tells me a not enabled write-cache:
> May  5 20:48:00 xen04 kernel: scsi190 : iSCSI Initiator over TCP/IP
> May  5 20:48:01 xen04 iscsid: connection189:0 is operational now
> May  5 20:48:02 xen04 kernel: scsi 190:0:0:0: Direct-Access
> SUN      SOLARIS          1    PQ: 0 ANSI: 5
> May  5 20:48:02 xen04 kernel: sd 190:0:0:0: [sdh] 10485726 512-byte
> hardware sectors (5369 MB)
> May  5 20:48:02 xen04 kernel: sd 190:0:0:0: [sdh] Write Protect is off
> May  5 20:48:02 xen04 kernel: sd 190:0:0:0: [sdh] Write cache:
> disabled, read cache: enabled, doesn't support DPO or FUA
> May  5 20:48:02 xen04 kernel: sd 190:0:0:0: [sdh] 10485726 512-byte
> hardware sectors (5369 MB)
> May  5 20:48:02 xen04 kernel: sd 190:0:0:0: [sdh] Write Protect is off
> May  5 20:48:02 xen04 kernel: sd 190:0:0:0: [sdh] Write cache:
> disabled, read cache: enabled, doesn't support DPO or FUA
> May  5 20:48:02 xen04 kernel:  sdh: sdh1
> May  5 20:48:02 xen04 kernel: sd 190:0:0:0: [sdh] Attached SCSI disk
> May  5 20:48:02 xen04 kernel: sd 190:0:0:0: Attached scsi generic sg11
> type 0
> M
> Question: Who can i enable the cache ? hdparms does not work:

You can't. The disk firmware doesn't support it. Thought I wouldn't worry much 
about it as
the iSCSI target (EqualLogic, NetApp, IBM, etc) will have a write/read cache - 
so
the data is being cached and isn't synchronous I/O (unless you define it as so).


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