Setup iSCSI on CentOS7. Mounted a iSCSI disk and am running a small MySQL 
instance on the disk. The iSCSI disk and MySQL instance all come online 
fine with booting but when shutting down things seem to get very upset and 
the drive does not get unmounted cleanly.

Does not look like I'm the only one having the issue. Another report that 
is very similar was posted here:

https://www.centos.org/forums/viewtopic.php?f=47&t=49337

This might be a systemd issue but figured I'd post here first to see if 
anyone else has had this issue and has any suggestions.

Relevant version info:

CentOS Linux release 7.0.1406 (Core)
systemd-208-11.el7_0.4.x86_64
iscsi-initiator-utils-6.2.0.873-21.el7.x86_64

Systemd unit file for MySQL server:

[Unit]
Description=MySQL Server
After=nss-lookup.target network.target remote-fs.target time-sync.target
Wants=nss-lookup.target network.target remote-fs.target time-sync.target

Logs from journalctl:

Dec 09 09:27:03 example.server.com kernel: EXT4-fs error (device sdb1): 
__ext4_get_inode_loc:4039: inode #58989720: block 235930089: comm mysqld: 
unable to read itable block
Dec 09 09:27:03 example.server.com kernel: EXT4-fs error (device sdb1) in 
ext4_reserve_inode_write:4962: IO failure
Dec 09 09:27:03 example.server.com iscsiadm[3906]: Logging out of session 
[sid: 1, target: example.target, portal: 192.168.1.30,3260]
Dec 09 09:27:03 example.server.com iscsiadm[3906]: Logout of [sid: 1, 
target: example.target, portal: 192.168.1.30,3260] successful.
Dec 09 09:27:03 example.server.com systemd[1]: Stopped Login and scanning 
of iSCSI devices.
Dec 09 09:27:03 example.server.com systemd[1]: Stopping Open-iSCSI...
Dec 09 09:27:03 example.server.com systemd[1]: Stopped Open-iSCSI.
Dec 09 09:27:03 example.server.com systemd[1]: Stopped MySQL database.
Dec 09 09:27:03 example.server.com systemd[1]: Stopping System Time 
Synchronized.
Dec 09 09:27:03 example.server.com systemd[1]: Stopped target System Time 
Synchronized.
Dec 09 09:27:03 example.server.com systemd[1]: Stopping Remote File Systems.
Dec 09 09:27:03 example.server.com systemd[1]: Stopped target Remote File 
Systems.
Dec 09 09:27:03 example.server.com systemd[1]: Unmounting /iscsi-disk...
Dec 09 09:27:03 example.server.com systemd[1]: Stopping Host and Network 
Name Lookups.
Dec 09 09:27:03 example.server.com systemd[1]: Stopped target Host and 
Network Name Lookups.
Dec 09 09:27:03 example.server.com kernel: Buffer I/O error on device sdb1, 
logical block 40960
Dec 09 09:27:03 example.server.com iscsid[853]: Connection1:0 to [target: 
example.target, portal: 192.168.1.30,3260] through [iface: default] 
Dec 09 09:27:03 example.server.com iscsid[853]: iscsid shutting down.
Dec 09 09:27:03 example.server.com mysqld_safe[1694]: 141209 09:27:03 
mysqld_safe mysqld from pid file /backup/mysql-bacula/data/mysqld.pid ended
Dec 09 09:27:03 example.server.com kernel: EXT4-fs warning (device sdb1): 
ext4_end_bio:287: I/O error writing to inode 58989720 (offset 0 size 4096 
starting block 40960)
Dec 09 09:27:03 example.server.com kernel: EXT4-fs error (device sdb1): 
ext4_find_entry:1309: inode #58982448: comm mysqld_safe: reading directory 
lblock 0
Dec 09 09:27:03 example.server.com kernel: Aborting journal on device 
sdb1-8.
Dec 09 09:27:03 example.server.com kernel: Buffer I/O error on device sdb1, 
logical block 133726208
Dec 09 09:27:03 example.server.com kernel: lost page write due to I/O error 
on sdb1
Dec 09 09:27:03 example.server.com kernel: JBD2: Error -5 detected when 
updating journal superblock for sdb1-8.
Dec 09 09:27:03 example.server.com kernel: EXT4-fs error (device sdb1): 
ext4_put_super:789: Couldn't clean up the journal
Dec 09 09:27:03 example.server.com kernel: EXT4-fs (sdb1): Remounting 
filesystem read-only
Dec 09 09:27:03 example.server.com systemd[1]: Unmounted /iscsi-disk.
Dec 09 09:27:03 example.server.com systemd[1]: Stopping Network is Online.
Dec 09 09:27:03 example.server.com systemd[1]: Stopped target Network is 
Online.
Dec 09 09:27:03 example.server.com systemd[1]: Stopping Network.
Dec 09 09:27:03 example.server.com systemd[1]: Stopped target Network.

Any help would be greatly appreciated.

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