Custom Query (1386 matches)

Support for external USB or FW drives is currently lacking on Mac OS X because that OS does not provide SCSI passthrough natively. There is however a kernel extension that promises to add exactly this: ​https://github.com/kasbert/OS-X-SAT-SMART-Driver . It would be great if the appropriate code could be added to os_darwin.* to support external drives under OS X also. I've taken a quick look at the code, but it doesn't look to be an easy fix without a serious bit of introduction...

When using smartctl with my Intel 330 SSD, two things caught my eye:

• The unknown attribute #249: According to [1], this should be the total number of NAND writes.

• The "Power_On_Hours" attribute: smartctl 5.42 returned some permanently changing number, so I tried the current trunk version. Now the values is returned as 4 numbers; the first one seems to be the number of hours plus a big offset, but what do the three in the brackets mean? The last one is always zero and the first one overflows from 255 to 0 after about a minute. If they are just the values of the "remaining three bytes" mentioned in [1], then the firmware probably returns garbage. Any Hints?

[1] Intel Solid-State Drive 330 Series Specification, ​http://www.intel.com/content/www/us/en/solid-state-drives/ssd-330-specification.html

When attempting to use the '-n' argument for smartctl on Mac OS X, it seems to always think the device is in SLEEP mode, at least for the drives I have available for testing.

Actual behaviour:

# smartctl -i -n standby /dev/disk0
smartctl 5.42 2011-10-20 r3458 [x86_64-apple-darwin11.3.0] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

Device is in SLEEP mode, exit(2)

This occurs even when actively using the disks (e.g. dd if=/dev/disk0...).

Also, the Power mode is displayed as SLEEP by specifying -n never:

# smartctl -i -n never /dev/disk1
...
=== START OF INFORMATION SECTION ===
Device Model:     INTEL SSDSC2CT120A3
Serial Number:    <removed>
LU WWN Device Id: <removed>
Firmware Version: 300i
User Capacity:    120,034,123,776 bytes [120 GB]
Sector Size:      512 bytes logical/physical
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  ACS-2 revision 3
Local Time is:    Fri Jun  1 11:47:52 2012 EST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
Power mode was:   SLEEP
...

Expected behaviour: Should detect and report the correct power mode.

System Info:

Have tried this with the following drives, with the same problem occurring:

• Hitachi HTS725050A9A362
• INTEL SSDSC2CT120A3

On a MacBook Pro (mid-2010), Intel 5 Series Chipset, Mac OS X 10.7.4.

Running smartmontools v5.42-1 from MacPorts:

# port echo installed | grep smartmontools
smartmontools                  @5.42_1+attributelog+savestates