Hi,
just had a look into the output of smartd in /var/log/messages.
Seems like the log mistakenly contains 198 Read_Sectors_Tot_Ct
as Offline uncorrectable sectors?
Mar 15 17:43:51 lake smartd[2821]: smartd 5.40 2010-03-05 r3074
[x86_64-suse-linux-gnu] (local build)#012Copyright (C) 2002-10 by Bruce Allen,
http://smartmontools.sourceforge.net#012
Mar 15 17:43:51 lake smartd[2821]: No configuration file
/usr/local/etc/smartd.conf found, scanning devices
...
Mar 15 17:43:51 lake smartd[3116]: smartd has fork()ed into background mode.
New PID=3116.
...
Mar 15 18:03:50 lake rsyslogd: -- MARK --
Mar 15 18:13:51 lake smartd[3116]: Device: /dev/sda [SAT], 95840173 Offline
uncorrectable sectors (changed +703184)
...
Mar 15 18:43:50 lake rsyslogd: -- MARK --
Mar 15 18:43:51 lake smartd[3116]: Device: /dev/sda [SAT], 96170325 Offline
uncorrectable sectors (changed +330152)
...
Mar 15 19:13:51 lake smartd[3116]: Device: /dev/sda [SAT], 96449717 Offline
uncorrectable sectors (changed +279392)
...
Mar 15 19:43:51 lake smartd[3116]: Device: /dev/sda [SAT], 96457509 Offline
uncorrectable sectors (changed +7792)
...
It would be really nice if:
208 Average_Erase_Count
209 Remaining_Lifetime_Perc
would instead be reported in the log:)
Am 09.03.2010 21:09, schrieb Frieder Ferlemann:
> actually I did never expect to report back this early,
> but I'm quite upset about the Average Erase Count
> of 72 of the drive.
>
> 198 Read_Sectors_Tot_Ct 0x0000 --- --- --- Old_age Offline
> - 82208608
> 199 Write_Sectors_Tot_Ct 0x0000 --- --- --- Old_age Offline
> - 106676155
> 200 Read_Commands_Tot_Ct 0x0000 --- --- --- Old_age Offline
> - 1781513
> 201 Write_Commands_Tot_Ct 0x0000 --- --- --- Old_age Offline
> - 2275882
>
> 208 Average_Erase_Count 0x0000 --- --- --- Old_age Offline
> - 72
>
> Meanwhile 6492 MByte have been written (106676155 - 93996899) Sectors *
> 512 Bytes /Sector
> while 1408511 MByte have been erased! (72 - 50) * 64.023.257.088 Bytes
>
> This would mean that wear leaveling (or garbage collection/whatever)
> causes an overhead of more than 200 in flash erase cycles!!!
>
> Intolerable.
>
> I hope there is a mistake in my calculations or somewhere else.
meanwhile the drive seems to continue self destruction:
9 Power_On_Hours 0x0000 --- --- --- Old_age Offline
- 126
12 Power_Cycle_Count 0x0000 --- --- --- Old_age Offline
- 36
198 Read_Sectors_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 96638645
199 Write_Sectors_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 115111795
200 Read_Commands_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 2073793
201 Write_Commands_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 2531426
208 Average_Erase_Count 0x0000 --- --- --- Old_age Offline
- 88
209 Remaining_Lifetime_Perc 0x0000 --- --- --- Old_age Offline
- 100
Since the last post
4319 MByte have been written (115111795 - 106676155) Sectors * 512
Bytes /Sector
while 1024372 MByte have been erased! (88 - 72) * 64.023.257.088 Bytes
So again more than 200 times more have been erased than have been written!!!
(output of smartctl -a is appended).
To put this factor into perspective:
For some other SSD drives "write amplification multipliers" of as low as
1.1 have been reported/claimed!
(I'd be happy with a factor of say 4 to 8 )
And I'm trying to treat the drive like a raw egg:
- More than 5% of the total drive capacity were never
assigned to a partition.
- And were never written to.
- And the root partition was mounted noatime
(output of "mount" was shown in an earlier post).
- And a 2.6.33 kernel is used.
- And I have aligned the partitions to 2 MBytes:
> fdisk -l /dev/sda
Disk /dev/sda: 64.0 GB, 64023257088 bytes
128 heads, 32 sectors/track, 30528 cylinders
Units = cylinders of 4096 * 512 = 2097152 bytes
Disk identifier: 0x3d2797a4
Device Boot Start End Blocks Id System
/dev/sda1 2 16386 33556480 83 Linux
/dev/sda2 * 16387 28675 25167872 83 Linux
Greetings,
Frieder
smartctl 5.40 2010-03-12 r3076 [x86_64-suse-linux-gnu] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Model Family: SuperTalent UltraDrive GX SSD
Device Model: STT_FTM64GX25H
Serial Number: P612102-MIBY-208A052
Firmware Version: 1916
User Capacity: 64.023.257.088 bytes
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: Exact ATA specification draft version not indicated
Local Time is: Mon Mar 15 22:42:21 2010 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
General SMART Values:
Offline data collection status: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: ( 0) seconds.
Offline data collection
capabilities: (0x1d) SMART execute Offline immediate.
No Auto Offline data collection support.
Abort Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
No Conveyance Self-test supported.
No Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x00) Error logging NOT supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 0) minutes.
Extended self-test routine
recommended polling time: ( 0) minutes.
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED
WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x0000 006 000 000 Old_age Offline
- 0
9 Power_On_Hours 0x0000 --- --- --- Old_age Offline
- 126
12 Power_Cycle_Count 0x0000 --- --- --- Old_age Offline
- 36
184 Initial_Bad_Block_Count 0x0000 --- --- --- Old_age Offline
- 93
195 Program_Failure_Blk_Ct 0x0000 --- --- --- Old_age Offline
- 0
196 Erase_Failure_Blk_Ct 0x0000 --- --- --- Old_age Offline
- 0
197 Read_Failure_Blk_Ct 0x0000 --- --- --- Old_age Offline
- 0
198 Read_Sectors_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 96638645
199 Write_Sectors_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 115111795
200 Read_Commands_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 2073793
201 Write_Commands_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 2531426
202 Error_Bits_Flash_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 282403
203 Corr_Read_Errors_Tot_Ct 0x0000 --- --- --- Old_age Offline
- 214025
204 Bad_Block_Full_Flag 0x0000 --- --- --- Old_age Offline
- 0
205 Max_PE_Count_Spec 0x0000 --- --- --- Old_age Offline
- 10000
206 Min_Erase_Count 0x0000 --- --- --- Old_age Offline
- 1
207 Max_Erase_Count 0x0000 --- --- --- Old_age Offline
- 573
208 Average_Erase_Count 0x0000 --- --- --- Old_age Offline
- 88
209 Remaining_Lifetime_Perc 0x0000 --- --- --- Old_age Offline
- 100
211 Unknown_Attribute 0x0000 000 000 000 Old_age Offline
- 0
212 Unknown_Attribute 0x0000 000 000 000 Old_age Offline
- 0
213 Unknown_Attribute 0x0000 000 000 000 Old_age Offline
- 0
Warning: device does not support Error Logging
Warning! SMART ATA Error Log Structure error: invalid SMART checksum.
SMART Error Log Version: 1
No Errors Logged
Warning! SMART Self-Test Log Structure error: invalid SMART checksum.
SMART Self-test log structure revision number 1
No self-tests have been logged. [To run self-tests, use: smartctl -t]
Device does not support Selective Self Tests/Logging
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