02:37 <MarchHare> Any of you guys somewhat familiar with mdadm on linux? Google's answers aren't very satisfying for what I'm asking.

02:38 <Mutabah> Somewhat, but it's not really on-topic here

02:39 <MarchHare> I'

02:39 <MarchHare> I'm aware. Fortunately, it's just an informational type of question and I don't see a lot of other traffic right now

02:40 <MarchHare> You can /msg me if you'd prefer.

02:54 <Mutabah> Eh, go for it here

02:58 <geist> sure yeah

02:58 <MarchHare> So I had some hardware go on the fritz. I had all four drives synced and in good shape, so the data was known to be good. However, one of the drives got out of sync before I realised what was actually happening, so it would've been wanting to resync. Anyway, I think I have the hardware issue resolved. I went to re-add the dropped drive and it's adding it as a spare. So right now it's saying raid device 3 is "removed" but that the one that I added is

02:58 <MarchHare> the spare. I'm trying to figure out if I should let the drives sync and it'll just go back to being part of set B, or if I should just recreate the array and restore from backup.

02:59 <MarchHare> Data itself still seems intact.

02:59 <geist> how long is it gonna take to sync?

02:59 <MarchHare> 5500 min.

02:59 <MarchHare> It's 4x 22TB disks.

02:59 <geist> well, depends on if you wanna wait that long

03:00 <MarchHare> Well, that's what I'm trying to decide.

03:00 <geist> but i thought it was adding it as a spare?

03:00 <MarchHare> If it's not going to promote it back to a full member of the array at the end of the resync, I'm just going to blow the disks away

03:00 <geist> i suspect you have to tell it that you're reinserting it and to resync

03:01 <MarchHare> I guess the question is "does it just call it a spare until it's a full member"

03:01 <geist> dunno

03:01 <MarchHare> Oh, it's already resyncing

03:01 <geist> oh yay

03:01 <geist> maybe it took a whiel to figure it out

03:01 <MarchHare> Like I said, I could always just blow it away and restore the 4.4TB from backup.

03:02 <MarchHare> But them I really only do have one copy.

03:02 <MarchHare> At least while the restore is happening

03:02 <geist> yeah i'd just wait

03:03 <geist> and funny right as you said this i have some sort of failure on my root disk of my workstation

03:03 <MarchHare> That's what I was thinking, too. But I was hoping someone else might know what it was going to do with the spare status.

03:03 <MarchHare> oof. Root failure is no fun. Disk or just filesystem damage?

03:04 <geist> seems to be okay now but i need to roll back some recent overclocking i was futzing with it seems

03:04 <MarchHare> My issue was related to a failing HDD cage backplane, and it turns out that also the SATA cable. I think it took out the SATA expansion card, too.

03:04 <geist> before it trashes my disk

03:05 <geist> got a large spew of BTRFS node corruption in dmesg and a RO locked down FS (good) right after messing around pushing the AMD 'curve optimizer' a bit in windows

03:05 <MarchHare> Honestly, I sort of wonder if that do some damage to the PCI-E bus, too. I know when the new sata card boots, its option rom shows disk 1, 2, & 3, but no 0. But disk 0 seems to be visible to linux.

03:06 <geist> soooo i'm sure not a coincidence

03:06 <MarchHare> geist: Wow. I didn't know anyone used BTRFS.

03:07 <MarchHare> geist: I've seriously never used it. Wasn't sure why I would want to. Ext4 always worked pretty well for me. Beat Ext2 hands-down

03:07 <geist> because of a pile of additional features it has that i find useful

03:07 <MarchHare> You've got my attention...

03:07 <geist> anyway, trying to fix things hang on

03:08 <geist> actually the fact that it immediately caught an internal consistency and locked down the FS is a pretty good example

03:09 <MarchHare> Okay, that's a fair argument

03:10 <geist> anyway i use subvolumes and snapshtos and whatnot a lot

03:11 <geist> as well as reflinks and other goodies

03:11 <geist> works great for backing up things, etc

03:13 <geist> reason i virtually rolled my eyes is it seems like 50% of the people i mention btrfs do respond similarly

03:13 <geist> i think it got a bad rap early on and like 10 years later folks are saying it's super unstable, etc

03:13 <geist> and AFAICT it's quite stable, and having lots of internal checksums and whatnot has helped me catch hardware failures much quickier

03:20 <MarchHare> I believe it.

03:20 <MarchHare> Maybe they haven't done a very good job selling it?

03:21 <MarchHare> I'm sure a lot of people remember the thing with ReiserFS

03:22 <geist> yah. lots of NASes and whatnot use it, synology comes to mind

03:24 <MarchHare> I remember I was starting to experiment with ReiserFS in 07, and then all that shit went down, and I noped right the fuck back to ext4. I have 25 years of shit backed up on that raid and I don't wanna lose it.

03:25 <geist> heh i remember it was a pretty solid fs for a while there. faaast

03:25 <geist> back in that window where ext4 hadn't come out yet i think, so compared to ext3 it was pretty quick

03:27 <MarchHare> I think ext4 was just becoming considered stable

03:27 <MarchHare> Maybe I noped right the fuck back to ext3

03:27 <geist> yah ext4 may have been around longer than i'd like to admit :)

03:27 <geist> i do remember it being a fairly large speed increase compared to ext3

03:27 <geist> at least on spinny disks since SSDs weren't really a thing then

03:28 <geist> now i think in general your fs can be slow and no one cares because SSD

03:30 <MarchHare> SSD are lightning fast. Wish they held a candle to the $/bit of spinning platter

03:46 <AmyMalik> Stop holding candles to things.

03:49 <MarchHare> You're right. I should hold a 2M candlepower spotlight to stuff!

03:50 <MarchHare> lol

03:50 <AmyMalik> I used to know someone who said that.

03:50 <MarchHare> Okay, time for bed. The damn array is rebuilding. If the spare doesn't drop in like a normal device in a few days, I'll blow it away and restore from backup.

04:15 <vai> morning from Finland

04:18 <MarchHare> Morning.

22:45 <geist> wonder if their array ever rebuilt

22:52 <nikolar> whose?

22:59 <geist> MarchHare's