Date: Sun, 10 Jul 2016 00:01:25 +0300 From: Mailing Lists <mailinglists35@gmail.com> To: freebsd-fs@freebsd.org Subject: help request for testing zfs issue Message-ID: <CABjXrGGrrQfMxZSf=P5T6D9oP4pJ0Vfb=bMF2C_uEkbybYmZKg@mail.gmail.com>
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Hi, I'm trying to learn if a zfs issue can be reproduced on freebsd. I myself have reproduced it on 10.3 and 11 beta inside a linux KVM vm, and also on linux, but don't have a separate physical fbsd installation at hand. I'd really be grateful to someone who can take some of their time to verify this. Be aware that I expect the test machine to be rebooted if the test is reproductible (or at least their zfs pools to become unavailable) so this is not for people who have their rootfs on zfs unless they want to take the risk of getting to a hang. FWIW, the test machines have less than 4Gb of ram (the test vm was tested with 1 and 3Gb) so maybe you want to limit the available ram at boot time if you have more. These are the steps that hang my pool under linux and under the fbsd vm: mount -t tmpfs -o size=2662400k tmpfs /mnt/test/ cd /mnt/test for l in `seq 0 9`; do dd bs=1M count=256 if=/dev/zero of=loop$l; done zpool create -o failmode=continue -O logbias=throughput -O atime=off -o autoreplace=on -O primarycache=metadata -O secondarycache=metadata -O compression=lz4 -m /srv/big big raidz3 /mnt/test/loop* dd if=/dev/zero of=/srv/big/file bs=4M #interrupt with ctrl-c after some Gb written ls -lh /srv/big/ du -csh /srv/big/ rm /srv/big/file zfs set compression=off big while true; do dd if=/dev/zero of=/srv/big/file bs=4M #on freebsd11 dd never complains about no free space left and just hangs and had to add count=421 rm -f /srv/big/file done Some time after many iterations (as many as 370 on an ubuntu linux machine), the pool should list write errors on it but no errors on vdev or each disk. On linux the kernel prints a message but on freebsd there is no message and you have to manually check for pool status. Please cc me on replies or directly comment on the ZoL issue tracker here https://github.com/zfsonlinux/zfs/issues/4832 Thank you in advance
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