Hardware Issue/SAN disk issue/Paths issue/Operating system issue

1. Always run fsck with -n option as first preference

# fsck -t vxfs -n /dev/vx/rdsk/datadg/vol01
fsck from util-linux 2.23.2
pass0 - checking structural files
pass1 - checking inode sanity and blocks
fileset 999 primary-ilist inode 8369 has invalid number of blocks (12888)
fileset 999 primary-ilist inode 8369 has invalid block map
fileset 999 primary-ilist inode 8369 failed validation clear? (ynq)n......................

................

UX:vxfs fsck.vxfs: ERROR: V-3-26117:  bc_read failure devid = 0, bno = 108776, off = 0, len = 8192

Also tried to collect Metasave but failing

# /opt/VRTSspt/FS/MetaSave/metasave_rhel7_x86_64 -f /tmp/metasave_vol01.out  /dev/vx/rdsk/datadg/vol01

/opt/VRTSspt/FS/MetaSave/metasave_rhel7_x86_64: read of block 0/32768 failed, substituting 0xa5
/opt/VRTSspt/FS/MetaSave/metasave_rhel7_x86_64: read of block 0/32768 failed, substituting 0xa5
/opt/VRTSspt/FS/MetaSave/metasave_rhel7_x86_64: read of block 0/32768 failed, substituting 0xa5
/opt/VRTSspt/FS/MetaSave/metasave_rhel7_x86_64: read of block 0/32768 failed, substituting 0xa5
/opt/VRTSspt/FS/MetaSave/metasave_rhel7_x86_64: read of block 0/32768 failed, substituting 0xa5
/opt/VRTSspt/FS/MetaSave/metasave_rhel7_x86_64: read of block 0/32768 failed, substituting 0xa5
/opt/VRTSspt/FS/MetaSave/metasave_rhel7_x86_64: read of block 0/32768 failed, substituting 0xa5

Solution :

# Try to mount the file system read only and if it succeeds then ask to take backup of important files or full backup

Please check if your Disk are in good condition and no hardware issue. This signifies that this is a hardware /SAN/ Paths/Disk Blocks Issue. Please fix these hardware issue.

Note : Its always good to have a valid Backup of complete FS, vxvm configuration and mirroring of volumes is highly recommended to mitigate this issue