Simon Farnsworth wrote: > Tejun Heo wrote: >> Simon Farnsworth wrote: >>> Just a thought; is it possible to trigger libata EH from userspace? If >>> so, we could write a small utility to disable write cache, then force EH >>> to detect the change. >> That's automatically done. libata snoops cache on/off and triggers >> revalidation but you can request manual rescan by echoing "- - -" to >> /sys/class/scsi_host/hostX/scan. >> > Would it be worth changing our code to do "hdparm -W1 /dev/sda && hdparm > -W0 /dev/sda", or would this not show anything. The lack of revalidation > on some drives is what's worrying me a little here. Revalidation happens after cache property is changed successfully. What happens if you request manual rescan while the drive is not repsponding? -- tejun - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
