James Sefton <james@...> writes: > > Hi, > > Seems I broke something. > > I have run into this problem about 3 times now where bCache (or something!) > seems to hang and I only just thought to check kern.log before trying to reboot > so was previously assuming something else had just got stuck! > > I only had 3 servers available to me and once this problem occurs, the servers > seems to get stuck rebooting so I cannot do another test to confirm tonight. (I > have put a reboot request in for them to be force rebooted but that will not get > actioned until tomorrow) > > Here is what I know about the most recent time this happened: > > I had already set-up and been using /dev/bcache0 and /dev/bcache1. They are > attached to the cache set and set to writeback. > > The problem occurred when I ran "echo /dev/rbd2 >/sys/fs/bcache/register". > This device had been newly formatted with "make-bcache -B /dev/rbd2" (rbd2 is > a SAN based block device) > > If it makes any difference - these commands are in a script so the register > command would have been run *immediately* after the make-bcache command > returned. (I am going to try sticking a sleep 3 or something in there tomorrow > - just in case its related to trying to register the device so quickly after it > was prepared) > > At this point my console just stops. I cannot CTRL+C to abort the echo command. > top shows increasing load average - presumably it thinks a process is stuck > waiting for something. Rebooting server kicks me out of console and then never > comes back. > > /dev/rbd0 and /dev/rbd1 are already registered at this point and were working > fine. If I open another console (did this before rebooting) and create > /dev/rbd3, and then try and register it - the same happens again. > > Here is what came up in kern.log: > > http://pastebin.com/xNBuv3sj > (Using Gmane to post and it complained about long lines) > > Any ideas? > > Cheers, > > James > > Yes, reproduced it after a clean boot. It gets stuck creating the third cache device. (/dev/bcache2) Here is the latest info from kern.log, but it looks very similar to what I posted before. http://pastebin.com/r8YRSNGR Any idea if I am doing something wrong or is this a bug? I need to create up to 64 cache devices. Possibly slightly over that on rare occasions. (The majority of servers will have 16-32) Many Thanks, James -- 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
