@root42 Embedded compilers are often trailing; we only just recently upgraded to a C++17 compiler at $DAYJOB. Can't get much further with the current hardware we're targetting as the CPU isn't supported by newer GCC or GLibC...
And there's also the thing about being mentally stuck to the version of C++ one learnt. I learnt C++ back in the late 1990s, and I still have some old code written from before namespaces that I just tacked "use namespace std;" on to be able to compile... 🙂
@nixCraft "ip a" is a little bit of what ifconfig displays by default; I often use it to get the packet statistics, including number of errors. I *still* haven't figure out how to get those out of "ip".
The file copying finished eventually. The tricky part was to switch to booting from the new Raid instead of the old, getting grub to read the correct kernel and pass the correct root. After a few rounds through booting from an USB image (#Ventoy ftw), and updating grub inside a chroot, it eventually worked.
Then I zeroed out the old RAID device, and ran mdadm with --grow and --raid-devices=2 to sync the new fs back to the old drive.
Took all day, and syncing those 2 terabytes takes a while longer still.
In their own docs, the Debian devs say, "If security or stability are at all important for you: install stable. period. This is the most preferred way." (https://www.debian.org/doc/manuals/debian-faq/choosing.en.html#s3.1) Personally, I'd always held the belief that trust in the package developers was sufficient, and that having the distro do extra checks was superfluous.
I now see that #Linux distros' approvals of #software is much like an enterprise #PatchManagement system: adding an extra layer of verification, checking for vulnerabilities/#threats, compatibility, and integrity within an environment as part of #DefenseInDepth#BestPractices against, among other tings, #SupplyChain attacks.
While my reservations about the age of Debian Stable's packages remains, that too may be changed some day. Security is all about learning and acting based on the best data and information available.
The 6+ hours overnight memtest gave me a PASS on the new memory configuration, so now I am *copying* the files over to a new hard disk (configured as a single-disk RAID1, to be updated with the disk I'm copying *from* afterwards).
Copying 1.5 Tbyte of files does take a while (5 hours and counting so far), but since I don't trust the metadata of the old filesystem, I am not taking the chance to just have Linux RAID mirror it over.
I need to clean up the filesystem, it is heavy with backups of backups of old root filesystem copies which had backups of old machines with backups on them...
@nixCraft It feels like they are don't Windows app distribution (ship all libraries in the binary directory), which is one of the reasons I don't like Windows.
But... I could see how the software I write at $DAYJOB that ends up as a DEB (previously RPM) in /opt is halfway there anyway, with a slew of private, forked libraries.
I think I will stick with something I know how to work with (ext4 or xfs over mdraid) as I have use that setup extensively both at home and at work. But if I get around to it, I might make me a toy VM to play with it a bit to learn more.
Turns out I took the wrong memory chip out. Now I have a combination of chips (including some older, smaller, ones) that earned me a "PASS" banner.
I am still going to rebuild the file system, I'm afraid there are deeper corruptions, but that will have to wait a little while. I've bought a new disk to replace the one that has been constantly-on since 2016 (the other one in the RAID is from 2019, so practically still brand-new).
@adrinux Is that somehow less resilient to driver bugs/memory corruption/cosmic radiation or whatever happened (I have no idea) than mdraid+ext4?
This is the first time I have had something like this happening after running mdraid+ext4 for well over a decade on multiple machines. I have not tested zfs, so I have no point of comparison.
It's never a good sign when fsck leaves 55 Gbytes worth of files in /lost+found
I guess it doesn't help to have the file system on RAID when the logical file system structures break. Seems mostly to be backups that are affected, though, those should repair themselves on the next backup run. That and a couple of Git repositories that lost some objects and needed to be recloned from checkouts/backups.
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