Had to transcribe these.  apologies for errors...

When ssh in to this box rejected

init: failed to spawn ssh main process: unable to execute: Input/Output error

Pattern below repeats every five minutes (300 seconds) same sector block and inode
Perhaps this is munin still trying to collect stats?

mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
end_request: I/O error, dev sda, sector 159645823
EXT3-fs error (device sda1): ext3_get_inode_loc: unable to read inode block - inode=4989038, block=19955720


Keyboard still responding:
Change consoles alt-F3, okay
press first character of username - bleargh, errors below.

tile login: 
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
end_request: I/O error, dev sda, sector 114394239
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
end_request: I/O error, dev sda, sector 1187713999
init: tty3 main process (1101) killed by BUS signal
init: tty3 main process ended, respawning
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
end_request: I/O error, dev sda, sector 114394223
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
end_request: I/O error, dev sda, sector 114426495
init: failed to spawn tty3 main process: UNable to execute: Input/Output error
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
end_request: I/O error, dev sda, sector 1187713999
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
mvsas 0000:01:00.0: mvsas exec failed[-132]!
ata7: translated ATA stat/err 0x00/00 to SCSI SK/ASC/ASCQ 0xb/00/00
end_request: I/O error, dev sda, sector 159645823
EXT3-fs error (device sda1): ext3_get_inode_loc: unable to read inode block - inode=4989038, block=19955720