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List:       smartmontools-support
Subject:    Re: [smartmontools-support] smart Airflow_Temperature_Cel attribute value on Micron RealSSD
From:       Christian Franke <Christian.Franke () t-online ! de>
Date:       2014-06-25 16:01:31
Message-ID: 53AAF25B.80104 () t-online ! de
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Janardhan Molumuri wrote:
> Thanks for your response, Christian.
> 
> > > smartctl -r ioctl,2 -i -H -d sat+megaraid,9 /dev/bus/0
> Attaching the output. smart status check returned -1.
> ...
> REPORT-IOCTL: Device=/dev/bus/0 Command=SMART STATUS CHECK
> Input:   FR=0xda, SC=...., LL=...., LM=0x4f, LH=0xc2, DEV=...., CMD=0xb0
> [ata pass-through(16): 85 06 2c 00 da 00 00 00 00 00 4f 00 c2 00 b0 00 ]
> sat_device::ata_pass_through: scsi_pass_through() failed, errno=38 [ATA return \
>                 descriptor not supported by controller firmware]
> REPORT-IOCTL: Device=/dev/bus/0 Command=SMART STATUS CHECK returned -1 errno=38 \
> [ATA return descriptor not supported by controller firmware] SMART overall-health \
> self-assessment test result: FAILED! Drive failure expected in less than 24 hours. \
> SAVE ALL DATA. Failed Attributes:
> ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  \
> WHEN_FAILED RAW_VALUE 190 Airflow_Temperature_Cel 0x0023   019   033   069    \
> Pre-fail  Always   FAILING_NOW 19 (Min/Max 17/33)

We have 3 issues here:

- LSI MegaRAID firmware does not support SAT ATA return descriptor which 
means that the (boolean) result from SMART RETURN STATUS command be read 
from the drive.

- smartctl reports this fact only in debug output (I fixed this in r3920).

- Drive returns bogus normalized VALUE and THRESHold for attribute 190.

If SMART RETURN STATUS does not work, smartctl checks the attribute 
table instead. Therefore smartctl reports a FAILED SMART test result 
which is possibly not identical to the actual status returned by the drive.

> 
> > > None of the specs or previous sample outputs from Micron RealSSDs 
> include attribute 190.
> What is the best way out in these cases to detect the health status of 
> the disks? Is there a flag or something to detect the value type 
> (normalized vs real)?

No, the value in the normalized VALUE field should always be normalized :-)

Could you possibly connect this drive to some Motherboard controller or 
other non-RAID controller and repeat the test?

Thanks,
Christian


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