hdparm -S <value> <device> read the man page to understand how to set the values, they are a not linear.
If you have an md device running overtop of it or LVM that would need to be stopped or disabled before device deletion. The scans are on the pci hardware that is over the device. in /sys/devices/pci0* there are scan/rescans and dev_rescan that tell the boards and/or chips to look again. Some will rescan the chip on the pci bus, some will check the device to see if it suddenly got bigger (SAN can resize luns). find /sys/devices/pci* -name "*scan*" -ls with lspci and other commands you should be able to determine what each device is under. The ancient standard is "- - -" and has worked whenever I have used it, but google may be able to confirm. On Thu, Jun 4, 2020 at 6:18 AM Patrick O'Callaghan <pocallag...@gmail.com> wrote: > > On Wed, 2020-06-03 at 18:04 -0500, Roger Heflin wrote: > > you might be able to do this: > > > > echo 1 > /sys/block/sdX/device/delete > > > > > > > > that will remove the sdX device, to get it back you would need to > > > > reboot or do a" > > > > echo "- - -" to the "scan" device under the device that controls it to > > > > bring it back. > > I'll think about that, though I suspect I'll need to stop md first, > otherwise deleting one device at a time might make md think it needs to > re-sync. > > > You may need to also use smartctl and/or hdparm (if this usb device > > > > will pass the commands through) > > > > to set the power down parameters on the disk so that it will power down. > > hdparm lets me "unload" the disks but that doesn't power them down (the > man page says they will keep spinning). > > poc > _______________________________________________ > users mailing list -- users@lists.fedoraproject.org > To unsubscribe send an email to users-le...@lists.fedoraproject.org > Fedora Code of Conduct: > https://docs.fedoraproject.org/en-US/project/code-of-conduct/ > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: > https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org
