On Mon, 23 Nov 2009, Ric Wheeler wrote: > Hi Alan, > > One quick question - how robust is our support for write barriers over USB? > > Specifically, I am looking to get together some testing with both > external USB and e-sata enclosure for various file systems and would be > very interested in helping make sure that this is well handled... It's extremely robust -- the USB mass-storage driver has a maximum command-queue length of 1! With the coming of USB 3.0 and the UASP (USB-Attached SCSI Protocol) specification this will change. I presume barriers will then be implemented as the need arises. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
