You are getting the following error repeating in the syslog:
Jun 4 10:48:01 Tower crond[1974]: failed parsing crontab for user root: #015
You should perhaps post the output of
cat /etc/crond.d/root
if it is not obvious what is causing that.
You also have the following:
Jun 5 02:33:34 Tower kernel: sd 10:0:3:0: [sdi] tag#1210 UNKNOWN(0x2003) Result: hostbyte=0x00 driverbyte=0x08 cmd_age=6s
Jun 5 02:33:34 Tower kernel: sd 10:0:3:0: [sdi] tag#1210 Sense Key : 0x3 [current] [descriptor]
Jun 5 02:33:34 Tower kernel: sd 10:0:3:0: [sdi] tag#1210 ASC=0x11 ASCQ=0x0
Jun 5 02:33:34 Tower kernel: sd 10:0:3:0: [sdi] tag#1210 CDB: opcode=0x88 88 00 00 00 00 02 8f 36 16 20 00 00 04 00 00 00
Jun 5 02:33:34 Tower kernel: blk_update_request: critical medium error, dev sdi, sector 10992621088 op 0x0:(READ) flags 0x4000 phys_seg 128 prio class 0
Jun 5 02:33:34 Tower kernel: md: disk1 read error, sector=10992621024
Jun 5 02:33:34 Tower kernel: md: disk1 read error, sector=10992621032
Jun 5 02:33:34 Tower kernel: md: disk1 read error, sector=10992621040
which looks like it may be a genuine disk issue so you should consider running an extended SMART test on it as a check.
There are also a lot of FCP warnings that it might be a good idea to consider tidying up.