Date: Sun, 11 Oct 2015 11:22:19 +0200 From: Michael Ranner <michael@ranner.eu> To: freebsd-fs@freebsd.org Subject: Re: Zfs locking up process Message-ID: <561A2A4B.4080704@ranner.eu> In-Reply-To: <CAFoaQoDVt5eJKTjcmGmR2fmQoL_WQV1ZebNUb_K9qLY4=cOi6A@mail.gmail.com> References: <CAFoaQoDdKHzASfgxY7ptHuqk=nCsxvpq4q3gr9_QsUK4Hkim9w@mail.gmail.com> <CAFoaQoCB5CmorF4wfabz7iBaqxzxxggdqJiqePUTqLCnFichWA@mail.gmail.com> <CAFoaQoAt--8pGh_vGVTfVWjEBJ5uRM0Tr6TS-czFbQ-eSHKvXg@mail.gmail.com> <CAFoaQoDVt5eJKTjcmGmR2fmQoL_WQV1ZebNUb_K9qLY4=cOi6A@mail.gmail.com>
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Am 07.10.15 um 17:11 schrieb Rajil Saraswat: > Hello > > I have server running Freenas 9.3 with a few jails. The machine has two new > disks setup in mirror. I have a dataset (/mnt/tank/media) which is shared > in two jails. > > Unfortunately, sometimes when I do a ls in a jail in the shared directory I > see that the process just hangs. > > Today in the jail I did an 'su' and process just hung. On the host if i do > ls /mnt/tank/media it also hangs. > > The su process (pid 77477) is taking up 100% cpu in the jail. It seems that > zfs is holding up the process. Any idea what could be wrong? > > It is a known problem with ZFS and nullfs. I had no problems under FreeBSD 8 witch such a setup, but since FreeBSD 9 it is very unstable to mount_nullfs on ZFS. I experienced the same behaviour with Apache jails and PHP, mostly PHP running with 100% CPU inside the jail. So you cannot "share" the dataset between to jails without the risk of hangs - its a problem inside the VFS. You should set the mountpoint via "zfs set" inside your jail. But you can do this only for one jail. Regards Michael
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