Hi, i have a script in which i invoke lvremove and lvcreate. With lvremove i don't have proplems but with lvcreate. I'm redirecting stdout and stderr to a file because the script is executed by cron and i'd like to have a look afterwards if everything went fine. The command is: lvcreate -v -L 25G -n lv_root_snapshot -s vg1/lv_root > lvcreate_with_redirection.log 2>&1. Shell does not accept further commands afterwards, but host still responds to ping. You can have a look on lvcreate_with_redirection.log here: https://hmgubox.helmholtz-muenchen.de:8001/d/b4c7025bac/ . System seems to stop while suspending. last lines of the log: ====================================================== ... Creating vg1-lv_root_snapshot-cow Loading vg1-lv_root_snapshot-cow table (252:3) Resuming vg1-lv_root_snapshot-cow (252:3) Loading vg1-lv_root_snapshot table (252:1) Suspending vg1-lv_root (252:0) with filesystem sync with device flush ====================================================== I did a strace on the command and that confirms it: strace -ftt lvcreate -v -L 25G -n lv_root_snapshot -s vg1/lv_root > lvcreate_strace_with_redirection.log 2>&1 last lines of the log (you find all the mentioned logs on the link): ==================================================================== ... 17:43:59.199487 ioctl(4, DM_TABLE_DEPS, 0x7875e0) = 0 17:43:59.199581 ioctl(4, DM_DEV_STATUS, 0x7875e0) = -1 ENXIO (No such device or address) 17:43:59.199680 ioctl(4, DM_DEV_STATUS, 0x7875e0) = -1 ENXIO (No such device or address) 17:43:59.199749 ioctl(4, DM_DEV_STATUS, 0x7875e0) = 0 17:43:59.199803 write(2, " ", 2 ) = 2 17:43:59.199905 write(2, " ", 2 ) = 2 17:43:59.199945 write(2, "Suspending vg1-lv_root (252:0) w"..., 69Suspending vg1-lv_root (252:0) with filesystem sync with device flush) = 69 17:43:59.199981 write(2, "\n", 1 ) = 1 17:43:59.200068 ioctl(4, DM_DEV_SUSPEND ==================================================================== Issuing the command without the redirection of stderr works ! lvcreate -v -L 25G -n lv_root_snapshot -s vg1/lv_root > lvcreate_with_redirection_without_stderr.log Snapshot is created and systems keeps on running (although snapshot is created in all cases, also with the commands which stop the server). When i use "lvcreate -v -L 25G -n lv_root_snapshot -s vg1/lv_root > lvcreate_with_redirection_without_stderr.log" in conjunction with unbuffer, system also keeps running: unbuffer lvcreate -v -L 25G -n lv_root_snapshot -s vg1/lv_root > lvcreate_with_redirection_unbuffer.log 2>&1 Logfile again on the internet. For the sake of completeness i did a strace without redirection and copied afterwards the content of the terminal to the file lvcreate_strace_without_redirection.log: strace -ftt lvcreate -v -L 25G -n lv_root_snapshot -s vg1/lv_root. System keeps on running. Any ideas why this behaves so strange ? Host is a virtual machine (KVM), running SLES 11 SP4 64bit. LVM is lvm2-2.02.98-0.37.2. My root directory resides on a lv: mount /dev/mapper/vg1-lv_root on / type ext3 (rw,strictatime,acl,user_xattr) ... /dev/vda3 on /boot type ext3 (rw,strictatime,acl,user_xattr) ... The host for the vm is also SLES 11 SP4 64bit. Bernd -- Bernd Lentes Systemadministration institute of developmental genetics Gebäude 35.34 - Raum 208 HelmholtzZentrum München bernd.lentes@helmholtz-muenchen.de phone: +49 (0)89 3187 1241 fax: +49 (0)89 3187 2294 Wer Visionen hat soll zum Hausarzt gehen Helmut Schmidt Helmholtz Zentrum München Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrer: Prof. Dr. Guenther Wess, Dr. Alfons Enhsen, Renate Schlusen (komm.) Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671 _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
