life ideas

December 6, 2006

hard drive spin of simpleshare

Filed under: Uncategorized — manoftoday @ 7:21 am

smartctl -d /dev/ide/host2/bus0/target0/lun0/disc
to disable SMART.

after turning smart off, hdparm -S functions correctly, the hard drive spin down as expected.

hdparm -S 50 /dev/ide/host2/bus0/target0/lun0/disc

From hdparm man page:
Set the standby (spindown) timeout for the drive. This value is used by the drive to determine how long to wait (with no disk activity) before turning off the spindle motor to save power. Under such circumstances, the drive may take as long as 30 seconds to respond to a subsequent disk access, though most drives are much quicker. The encoding of the timeout value is somewhat peculiar. A value of zero means “timeouts are disabled”: the device will not automatically enter standby mode. Values from 1 to 240 specify multiples of 5 seconds, yielding timeouts from 5 seconds to 20 minutes. Values from 241 to 251 specify from 1 to 11 units of 30 minutes, yielding timeouts from 30 minutes to 5.5 hours. A value of 252 signifies a timeout of 21 minutes. A value of 253 sets a vendor-defined timeout period between 8 and 12 hours, and the value 254 is reserved. 255 is interpreted as 21 minutes plus 15 seconds. Note that some older drives may have very different interpretations of these values.
I have verified that HDD actually supports standby (Most modern HDDs support standby) by issuing following command.
hdparm -y /dev/ide/host2/bus0/target0/lun0/disc

This command puts the SimpleShare into standby immediately. If I try to access SimpleShare drive from any Windows machine then SimpleShare wakes up by itself.



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