On Sun, May 14, 2017 at 05:33:12PM +0800, 朱菁 wrote: > Hi: > Thx for your reply. > /dev/sdb on esxi-node equal bcache0 on stor-node. sorry, it just looked too easy :-) I have also seen suspiciously high iostat values on bcache devices, where extreme values of "wkB/s" go together with high "avgrq-sz" (probably a derived value), but never on two consecutive measurements, always several days in between. But "%util" always looked ok. Since iostat is just reading /proc/diskstat, I would rather suspect some (bcache related) bug there. Sometimes I also see funny numbers in writeback_rate_debug, e.g. increasing "dirty" values like this: 2.8M .. 2.9M .. 2.10M .. 3.0M Matthias -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
