Currently on 13.2 with a RAID1 on sdb and sdc. (1 TB each)
Expert partitioner during install of 42.2 from DVD shows that the RAID devices are sda and sdb. That’s not reassuring. Is the change of designation for the HDD devices going to affect the data on the disks? the RAID array? Can I accept the changes with confidence? I don’t see a way to change device designation manually in order to keep the current sdx names.
Thanks.
Hi, was there a /dev/sda on your 13.2 install, and if so, what was that?
/dev/sdX designations are not specified to be constant, though they can appear to be at times.
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Hi
The sda under 13.2 was a third HDD (about 500 GB) that contained / and other system directories. It appears under 42.2 as sdc, and would be formatted during the new install. The RAID pair mounts at /home.
In yast partitioner you can set each partition ID method in fstab options, for mountable partitions of course. For example, changing from device name to UUID will update the partition’s fstab entry from
/dev/sda3 /home …
to
UUID=57865f5e-6412-409b-9870-c1c601750bee /home …
The shorter, more easily remembered format appeals to me. Is there a reason to convert to UUID?
Well it is more device reliable
sdX# format values may change if another device or a new drive is introduced. It is controlled by the BIOS and thus outside forces can change the drive order. UUID on the other hand is set in each partition when created and thus do not change on changes of the BIOS’s whims. However UUID can change on rezising or other partition level changes
Labels are also stable but the down side is that they must unique in the system. Two drives or partitions having the same label will confuse the system.
So each way has plus and minus. It is up to how you use and backup the system
Not if you have only a few partitions. For instance, with only one internal HDD/SSD, it’ll will always be /sdaX. Any external drive or pendrive will get sdb, sdc, sdd etc. device names. If however you rely on this external device for a timed backup, for example, it is probably safer to use a persistent name.
If you have six 2/3TB internal disks and a gazillion partitions being changed/updated/extended/messed up as I have here, UUID is way better, with one proviso: when cloning a disk for substitution, first change the naming scheme to device name (sdX), or the new drive partitions will not mount (wrong UUID). After substitution revert to whatever you were using. UUID is also the default choice during installation IINM.
You can also mount by label, which should be much clearer if you manage your labels correctly (no duplicate labels, etc). Never used it, thou.
… it would help straighten up your mess. After things are working properly, you can then go back and look at other options, such as mounting by label, as mentioned above.
Mounting by sdXn is a lot less dependable, as they can easily move around on you, also mentioned in an above post.
Incorrect. Quite often external drives are enumerated before internal HDD, getting sda.
Yes, indeed, I have seen that many, many times. It would be safe to say that most often – but by no means always – the internal HDD is seen first, but which one and when, if more than one internal HDD, is yet another matter.
openSUSE Leap 42.2 Release Notes: <https://doc.opensuse.org/release-notes/x86_64/openSUSE/Leap/42.2/>.
The notes in the section “System Upgrade” have a subsection for the 13.2 case but, there’s only a mention of the change of the Network Interfaces naming convention.
May be you could raise a Bug Report against the Release Notes (yes, there is a Bug Report class especially for the Release Notes) to have the changes you’re experiencing documented.
Indeed, I was wrong. My apologies to the OP if he ran into this issue. I never did, but then my storage has always been either internal or NAS/networked, no external devices attached before (infrequent) boots.
Took a “Leap” so to speak and went with the sdx nomenclature suggested by the 42.2 installer. Seems to have worked out OK.