Am 08.04.2015 um 12:15 schrieb Jan Engelhardt:
On Wednesday 2015-04-08 10:22, Stefan Seyfried wrote:
/dev/sd* are in the class of the most unstable names you can possibly /get.
No, actually not.
In "normal" setups (no multipath, fancy storage etc), all disks are /dev/sd*
I have access to a normal setup.
Typical desktop tower box (19"x4RUx~55cm usual size), with extra 3.5" cages ex factory. Contains 16 disks,
"normal".
connected via the cheap €19 off-the-shelf SATA PCIe cards,
"normal".
no "fancy" orderly backplanes, everything is more or less loose the way you'd expect it from a home user. sata_sil and 2x sata_mvw IIRC, and then of course the onboard ahci.
Depending on the moon phase, the assignment of sdg-sdp regularly shuffle at boot.
I'd guess this happens after kernel updates or such, not when rebooting the same kernel without rebuilding initrd. But anyway, these are the cases where /dev/disk/by-$WHATEVER is made for. I still would use by-label, but you can use anything and it will work. a "normal" setup as I consider it today allows you to only put in one disk. Everything more is external (USB, ExpressCard or such) and probably not put into fstab anyway. A "normal" setup nowadays (IMHO) for "normal" users is a notebook computer, maybe a nettop or stuff like the intel NUC boxes. People building home storage arrays with 16 disks, without using LVM or raid setups, are usually able to configure by-$WHATEVER. I too still have a single "home server" box with 3x rotating rust plus 1 ssd (used for bcache) plus DVB Cards plus serial multiport cards. And I actually can make the disks change order by changing BIOS settings. But I wouldn't dare using this example for advocating default for standard installations. And it mounts everything "by-label", except stuff that's on LVM: seife@server:~> grep -v ^# /etc/fstab LABEL=root / ext4 acl,user_xattr 1 1 LABEL=boot /boot ext3 acl,user_xattr 1 1 LABEL=log-journal /var/log/journal xfs defaults 1 1 LABEL=home.bcache /home ext4 acl,user_xattr 1 2 LABEL=space1.bcach /space1 xfs logbufs=8,logbsize=262144 1 2 /dev/local/system-swap swap swap defaults 0 0 /dev/4TB.1/4TB.1 /space2 xfs logbufs=8,logbsize=256k,inode64 1 2 LABEL=2TB_space3 /space3 xfs logbufs=8,logbsize=262144 1 2 LABEL=srv /srv xfs logbufs=8,logbsize=262144 1 2 /space2/capture/vdr /export/vdr fuse.vdrfs allow_other 0 0 /space1/dist/openSUSE-13.2-DVD-Build0019-x86_64.iso /space1/dist/openSUSE-13.2-x86_64 iso9660 loop,ro 0 0 [...snip /proc,/sys, whatever is not a device...] seife@server:~> cat /proc/cmdline root=/dev/disk/by-label/root sysrq=yes printk.time=1 acpi_enforce_resources=lax -- -- Stefan Seyfried "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." -- Richard Feynman "Your mail is 7 pages of printout. Do you seriously expect people that do openSUSE in their free time to read that? Little less Castro, little more JFK..." -- coolo -- To unsubscribe, e-mail: opensuse-factory+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-factory+owner@opensuse.org