[SOLVED] Automatically put HDD to sleep mode after start

Hi everyone.
I use a secondary HDD for backups. It's plugged to my computer permanently but actually it is needed for a few seconds per day. A backup script automatically shuts it down after backing up with `hdparm -Y` to save a power and reduce a noise. And I want to shut down an HDD also every time after the system is started.
I tryed two ways to implement this.
1. Udev rule that runs `hdparm -Y` for the device identified by ID_SERIAL_SHORT attribute.
2. Following systemd service:
[Unit]
Description=Put HDD to sleep mode immediately
After=systemd-udev-trigger.service
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/sbin/hdparm -Y /dev/disk/by-id/ata-SAMSUNG_SP2514N_S08BJ1HL210777
[Install]
WantedBy=sysinit.target
Both methods actually run hdparm, but state of the HDD is active after login (I check it with hdparm -C). It looks like something in systemd "touches" the hard drive and wakes it up back. And I can't find what may access the secondary HDD after udev rules are processed.
What is correct way to solve the issue?
Thanks.
Last edited by dimich (2013-05-03 02:32:38)

Well, I think you would need to determine everything that might be polling your drives during the boot process, which might be a pretty big task. Then use that information to determine either when udev should run that command, and use the lexicographically ordered rules to try finding just the right spot (and even then it might just come down to a race). Or you can use the gathered info to try and make systemd's service dependencies do the work for you. Either way, I would honestly rather just use a timer.

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Step 1
Take all the applicable steps in this support article. That's the starting point for any further efforts to solve the problem. Please read the whole article carefully and don't skip any of the steps, including the ones under the heading Additional troubleshooting. If you don't understand any of the steps, ask for guidance.
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Step 2
If you're running OS X 10.8.5 or earlier, from the menu bar select
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If the checkbox at the bottom marked
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If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode. All other data will be preserved.
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I also heard that OCZ has some garbage collection algorythm that makes up for Mac's lack of TRIM support.
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I think you are asking - "If I put ssds to sleep when possible does it mean that the garbage collection will not work?", since hdds don't have the garbage collection.
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+OCZ's goal is to keep SSD performance at peak levels over the drive's lifespan. OCZ, he said, uses two basic garbage collection methods: incorporating the maintenance within firmware, and providing user-initiated tools to accomplish the same task. OCZ provides three different garbage collection methods, said Chang.Some OCZ drives feature idle-time garbage collection in the firmware, including PCI-Express and high-capacity 3.5-inch SSDs, which aim for high-performance endurance. OCZ's mainstream 2.5-inch SSD solutions ship with TRIM support, which is enabled on Windows 7 and various Linux versions.+
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I find the whole OCZ presentation rather sloppy. I am sure they have good drives, but after reading on OCZ, it makes me want to take a nap.
Message was edited by: aprouser

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http://support.apple.com/kb/ht1776
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[SOLVED] Automatically put HDD to sleep mode after start

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