tonefert.blogg.se - Unmount disk in linux

Unmount disk in linux driver#
Unmount disk in linux software#

Unmount disk in linux driver#

If you're using some other sort of SATA controller, the driver might be confused by hotplugging. If you're using an AHCI controller, it should cope with devices being unplugged. When I do that with a drive in an eSATA enclosure, I can hear the drive's heads park themselves, so the kernel apparently tells the drive to prepare for power-down. That'll unregister the device from the kernel, so you know nothing's using it when you unplug it. If you want to be extra cautious, do echo 1 | sudo tee /sys/block/(whatever)/device/delete first. ( echo 1 | sudo tee /sys/block/(whatever)/device/delete)

Tell the system, that we are unplugging the HDD, so it can prepare itself.

(irrelevant for SSD's) ( sudo hdparm -Y /dev/(whatever))

You Could unplug the HDD here, but it is recommended to also do the last two steps.

Make sure nothing is using the disk for anything.

Please point to some official documentation if possible, I could not find anything in the Linux documentation tree, nor the Linux ATA wiki. So, what is the correct way to remove an attached disk from a system? Assume that I have already unmounted every partition on the disk and ran sync.

I doubt whether is the correct way to do so, but I cannot find some proof against it either. Replace X with the appropriate number for your SATA/eSATA port. Some driver/chipset combinations do not properly handle hotplugging and need a warmplug command such as the following one: echo 0 - 0 > /sys/class/scsi_host/hostX/scan How the chipset and driver handles this is another question. not damaged if you insert/pull the plug). This will power the drive down allowing for it's removal w/o risk of voltage surge.ĭoes this mean that the disk caches are properly flushed and powered off thereafter?Īll SATA and eSATA hardware is physically able to be hotplugged (ie. (where X represents the device you wish to power off.

Unmount disk in linux software#

What then do you do on the software side before unplugging? Is it a simple "umount /dev/sd"?Īfter unmounting the device, to "power off" (or sleep) the unit: hdparm -Y /dev/sdX How can I safely remove the SATA disk from the system? This Phoronix forum thread has some suggestions: At other times, I have the very weird setup of connecting a SSD using a SATA-eSATA cable on my laptop while pulling power from a desktop.

I sometimes need to plug a disk into a disk bay.