Issue 1) Server FS went to readonly mode.
Sol 1) Server rebooted recently but fsck was not heppened due to FS (/etc/fstab 0 0) on perticulat FS.
We tried to umount the FS forcefully but noticed “device busy” error then ran below commands
i) lsof /opt/commvault – Nothing is using
ii) fuser –u /opt/commvaul – None of the process using
iii) fuser –vm /opt/commvault – Noticed one of the user under directory. Hence asked them to come-out of it, Then ran the “fsck” and it’s fixed the issue.
Note: If we are rebooting the server to fix the “read-only” issue, make sure that file system should set to run “fsck” on it( means should be 1 2, not 0 0 ).
Issue 2) NFS mount issue
Sol 2) If df -h hung in production server before lazy mount try this one, it works
1)lsof /Backup
2)fuser -ck /Backup
3)umount -f /Backup
4)fuser -ck /Backup
5)umount -f /Backup
gw-server:~ # # umount -f /oracle/NFS_BAKumount.nfs: /oracle/NFS_BAK: device is busy
gw-server:~ # # fuser -ck /oracle/NFS_BAK
gw-server:~ # # umount -f /oracle/NFS_BAK
Issue 3) Information about Linux SCSI Devices (sdX)
lsscsi -s
ls -d /sys/block/sd*/device/scsi_device/*
ls -d /sys/block/sd*/device/scsi_device/* |awk -F '[/]' '{print $4,"- SCSI",$7}'
ls -l /dev/disk/by-id
http://www.virten.net/2015/08/match-linux-scsi-devices-sdx-to-virtual-disks-in-vmware/
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