Date: Sun, 29 Nov 2015 15:00:54 +0300 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: "Mikhail T." <mi+thun@aldan.algebra.com> Cc: stable@freebsd.org, freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: cp from NFS to ZFS hung in "fifoor" Message-ID: <20151129120053.GA70867@zxy.spb.ru> In-Reply-To: <5659CB64.5020105@aldan.algebra.com> References: <5659CB64.5020105@aldan.algebra.com>
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On Sat, Nov 28, 2015 at 10:42:28AM -0500, Mikhail T. wrote: > I was copying /home from an old server (narawntapu) to a new one > (aldan). The narawntapu:/home is mounted on aldan as /mnt with flags > ro,intr. On narawntapu /home was simply located on an SSD, but on aldan > I created a ZFS filesystem for it. > > The copying was started thus: > > root@aldan:/home (435) cp -Rpn /mnt/* . > > for a while this was proceeding at a decent clip with cp making > newnfsreq-uests: > > load: 0.78 cmd: cp 38711 [newnfsreq] 802.84r 1.57u 140.63s 20% 10768k > /mnt/mi/.kde/share/apps/kmail/dimap/.42838394.directory/sent/cur/1219621413.32392.hd8cl:2,S > -> > ./mi/.kde/share/apps/kmail/dimap/.42838394.directory/sent/cur/1219621413.32392.hd8cl:2,S > 100% > load: 1.23 cmd: cp 38711 [newnfsreq] 874.19r 1.66u 154.74s 17% 4576k > /mnt/mi/.kde/share/apps/kmail/dimap/.42838394.directory/ML/cur/1219595347.32392.rMDFf:2,S > -> > ./mi/.kde/share/apps/kmail/dimap/.42838394.directory/ML/cur/1219595347.32392.rMDFf:2,S > 100% > > ZFS on the destination compressing and writing stuff out and the traffic > between the two ranging from 30 to 50Mb/s (according to systat), but > then something happened and the cp-process is now hung: > > load: 0.55 cmd: cp 38711 [fifoor] 1107.67r 2.09u 194.12s 0% 3300k > load: 0.50 cmd: cp 38711 [fifoor] 1112.66r 2.09u 194.12s 0% 3300k > load: 0.22 cmd: cp 38711 [fifoor] 1642.37r 2.09u 194.12s 0% 3300k > # grep -r fifoor /usr/src/ /usr/src/sys/fs/fifofs/fifo_vnops.c: PDROP | PCATCH | PSOCK, "fifoor", 0); May be cp try copy fifo's content, by incorrectly detect special file?
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