On Wed, 2025-10-01 at 12:59 -0500, Roger Heflin wrote: > Does "a disk drive from a defunct CentOS-7 system was mounted. " > include physically cabling the drive in and/or connecting the given > drive or just mounting a disk device that has been there the entire > time? > > If you physically added a another disk it may be booting from the > wrong disk and/or the added disk may be confusing grub in some manner > because it is an earlier device than the real boot disk.
If you do that kind of thing; have a removeable drive plugged into a motherboard SATA port, that's not meant to ever be the boot drive. e.g. You temporarily plug in drives to rescue things, rather than doing drive hardware swapping for dual/triple/quadruple OS booting reasons. Then you might want to do this: Open up the case and ensure that your main drive is plugged into the first SATA port, and other drives are connected to higher number ports. Check the motherboard manual if the ports don't have obvious labelling on them. Most motherboards apply a ranking to their ports, and you always want your boot drive to be /dev/sda (for instance) and the next drive to be /dev/sdb (for example). And while many motherboards allow you to change the boot drive via a menu, the results of that are not always as straight-forward as you might think. Especially when some drives come and go. This can also be seen when you boot from optical media or a USB flash drive, it (probably) becomes /dev/sda and your normal drive changes its device name to /dev/sdb. More so with USB drive booting than optical drive booting (they tend to get a different device naming scheme). You have to remember to take that into account if you're booting from other media to fix something up. Such as when you're editing /etc/fstab, or using commands (such as GRUB utilities) that refer to drives by device names rather than volume labels or UUIDs. This is one issue where booting from the rescue kernel on your boot drive can be extra helpful, rather than booting from a live image on something else. Your drive device name allocations will (most likely) be the same as normal. -- uname -rsvp Linux 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64 (yes, this is the output from uname for this PC when I posted) Boilerplate: All unexpected mail to my mailbox is automatically deleted. I will only get to see the messages that are posted to the mailing list. -- _______________________________________________ users mailing list -- [email protected] To unsubscribe send an email to [email protected] 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/[email protected] Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
