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await y DT01ACA200

En los nodos twin con discos TOSHIBA DT01ACA200 en raid software, la escritura cae a niveles de 10Mb/s, sin patron aparente, cuando esto sucede:

Device:         rrqm/s   wrqm/s     r/s     w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
sdb               0.00   854.50    0.00   35.50     0.00  7120.00   200.56     0.29    8.11   0.41   1.45
sda               0.00   882.50    0.00   31.00     0.00 29688.00   957.68   129.44 '''3470.82'''  32.26 100.00

Buscando Soluciones

Por el momento la solucion es poner al disco en standby (no afecta al sistema, ni al raid, cuestion de segundos ), y con esto el disco vuelve a tasas habituales.

[root@wn013 sbin]# hdparm -C /dev/sda; hdparm -y /dev/sda ;hdparm -C /dev/sda

/dev/sda:
 drive state is:  active/idle

/dev/sda:
 issuing standby command

/dev/sda:
 drive state is:  standby


Con esta operacion aumentalos los contadores SMART: start_stop_count , power-off_retract_count, load_cycle_count

cexec macc2:1,3,5,7,9,11,13,15 "smartctl -a /dev/sda |grep -e Start -e Power_C -e Power-Off -e Load ; smartctl -a /dev/sdb |g
************************* macc2 *************************
--------- wn011---------
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       12
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       11
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       21
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       21
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       13
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       12
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       21
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       21
--------- wn013---------
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       17
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       15
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       25
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       25
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       16
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       16
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       27
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       27
--------- wn015---------
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       45
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       44
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       51
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       51
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       39
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       37
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       45
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       45
--------- wn017---------
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       22
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       22
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       34
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       34
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       23
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       22
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       33
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       33
--------- wn019---------
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       12
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       12
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       21
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       21
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       13
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       12
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       20
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       20
--------- wn021---------
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       4
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       4
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       42
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       42
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       4
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       4
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       42
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       42
--------- wn023---------
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       3
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       3
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       41
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       41
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       3
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       3
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       41
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       41
--------- wn025---------
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       14
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       14
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       26
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       26
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       16
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       14
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       24
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       24