Re: [Smartmontools-database] SuperTalent Ultradrive GX FTM64GX25H (SSD, Indilinx Barefoot controller)

[Frieder F. <fri...@we...>]

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