Re: NFSv4 first read/write takes 1 minute to start
Jonas Meurer jo...@freesources.org writes: Hi Mart, Am 28.06.2015 um 21:40 schrieb Mart van de Wege: I run a fileserver and am trying to switch over from NFSv3 to NFSv4 with RPC-GSS. My exports work, and my clients nicely authenticate to the Kerberos server and the NFS server, I can mount the exported filesystems and cd into them. But as soon as I try to read or write anything on the mounted filesystem, I get a timeout of 1 minute. After that, all other reads and writes on the mounted filesystem proceed normally. I cannot help you with a comprehensive explanation, but at least I discovered similar timeouts while fiddling around with my new NFSv4+Kerberos setup. The first operation on a fresh mounted NFS share took ages (one minute is quite possible). I don't remember whether it timeouted or succeeded in the end. Now that everything is in place and working as expected, I no longer discover these timeouts. Every operation (read+write) to the NFS share, starting with the first one, finishs within milliseconds. Well, it gets worse. After a day I tried it again, but from work over a VPN. This time the first write operation (touching a test file) finished within the bounds of the speed of the VPN connection. So apparently some old information got cached somewhere and invalidated by the passing of time. On Thursday I am back on location, I will check again to see if the problem persists at local network speeds. I tested it with sec=sys, and that shows no difference. Mounting goes fine, cd goes fine, first operation hangs. Do you have your PTR records set correctly? Not sure whether it is related, but apart from fixing Kerberos principal mapping and ticket cache handling, the missing PTR record for my Kerberos/NFS server was one of the last things I fixed. It's my home/development server; it runs on an entirely internal zone, with full and correct PTR records. It's been running Kerberos for years now for other services, and incorrect DNS has already bitten me in the past. -- We will need a longer wall when the revolution comes. --- AJS, quoting an uncertain source. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/86vbe5kasz@gaheris.avalon.lan
Re: NFSv4 first read/write takes 1 minute to start
Hi Mart, Am 28.06.2015 um 21:40 schrieb Mart van de Wege: I run a fileserver and am trying to switch over from NFSv3 to NFSv4 with RPC-GSS. My exports work, and my clients nicely authenticate to the Kerberos server and the NFS server, I can mount the exported filesystems and cd into them. But as soon as I try to read or write anything on the mounted filesystem, I get a timeout of 1 minute. After that, all other reads and writes on the mounted filesystem proceed normally. I cannot help you with a comprehensive explanation, but at least I discovered similar timeouts while fiddling around with my new NFSv4+Kerberos setup. The first operation on a fresh mounted NFS share took ages (one minute is quite possible). I don't remember whether it timeouted or succeeded in the end. Now that everything is in place and working as expected, I no longer discover these timeouts. Every operation (read+write) to the NFS share, starting with the first one, finishs within milliseconds. I tested it with sec=sys, and that shows no difference. Mounting goes fine, cd goes fine, first operation hangs. Do you have your PTR records set correctly? Not sure whether it is related, but apart from fixing Kerberos principal mapping and ticket cache handling, the missing PTR record for my Kerberos/NFS server was one of the last things I fixed. Cheers, jonas -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/5591bb29.1030...@freesources.org
NFSv4 first read/write takes 1 minute to start
Hi, I run a fileserver and am trying to switch over from NFSv3 to NFSv4 with RPC-GSS. My exports work, and my clients nicely authenticate to the Kerberos server and the NFS server, I can mount the exported filesystems and cd into them. But as soon as I try to read or write anything on the mounted filesystem, I get a timeout of 1 minute. After that, all other reads and writes on the mounted filesystem proceed normally. I used to get a 'Unable to create client record on stable storage: -110' error in dmesg, but that went away after I created the missing '/var/lib/nfs/v4recovery' directory. Otherwise I am not getting any NFS related errors in the logs, just a horrid timeout on the first filesystem operation. I tested it with sec=sys, and that shows no difference. Mounting goes fine, cd goes fine, first operation hangs. Anyone have any clue what is going on here? -- We will need a longer wall when the revolution comes. --- AJS, quoting an uncertain source. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of unsubscribe. Trouble? Contact listmas...@lists.debian.org Archive: https://lists.debian.org/86zj3jk4f7@gaheris.avalon.lan
