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Oh wow, these numbers are huge - there is a problem on the storage array. Can you describe your storage in more detail? What spindles, is it directly attached.. etc?
EDIT: ok, the vmkwarning.log is overflowing with HBA-related errors. I strongly suggest you try replacing cables on the path from your drives to the RAID array, unplugging the drive SAMSUNG_HD103SJ with s/n S246J9FB504743 and check it for SMART errors in antoher box. Or it could mean that your RAID controller is failing OR its battery is discharged and it is now in write-through mode instead of write-back.
2014-09-09T22:07:39.412Z cpu1:13555229)WARNING: ScsiDeviceIO: 1223: Device t10.ATA_____SAMSUNG_HD103SJ_________________________S246JX0B402652______ performance has deteriorated. I/O latency increased from average value of 2396 microseconds to 72$
2014-09-09T22:35:17.872Z cpu3:5172241)WARNING: LinScsi: SCSILinuxQueueCommand:1207: queuecommand failed with status = 0x1056 Unknown status vmhba0:0:0:0 (driver name: ahci) - Message repeated 423 times
2014-10-15T08:45:07.208Z cpu4:32791)WARNING: NMP: nmp_DeviceRequestFastDeviceProbe:237: NMP device "t10.ATA_____SAMSUNG_HD103SJ_________________________S246J9AB512721______" state in doubt; requested fast path state update...
2014-10-15T08:45:07.220Z cpu2:32952)WARNING: HBX: 1781: HB [HB state abcdef02 offset 3534848 gen 26355 stampUS 2398250094474 uuid 54199c09-9cef6656-2d8c-8c89a52d98d3 jrnl <FB 857000> drv 14.60] was aborted on vol 'datastore4', disk contents unkno
Edit2: Come to think of it you might have this Samsung drive as a single drive to store your ISOs? If so then try placing another drive instead and try it out...