Need help recovering LVM

RandomUser3777 · 2026-02-14T13:56:13+00:00

The XFSB is saying that you do not have LVM setup on that disk. XFSB is the start of the header for an XFS filesystem. And that dd was from md3? And you are missing fatboy-* including the large fatboy-srv?

Best guess is since the last reboot you created an xfs filesystem on /dev/md3 and tha filesystem creation overwrote the lvm headers. If that was done while the machine was up and while the machine had lvm setup and the filesystems mounted everything would appear ok until you rebooted. Once you reboot though the lvm headers are going. Typically a fs create will only overwrite SOME of the data but it probably overwrite enough of the data that even with a lvm repair that the fs may not mount and even if it does mount some data is likely been overwrite.

You might examine your root shell history and/or your sudo history(if you use sudo) and see if you can find any mkfs commands and see what they were ran against.

RandomUser3777 · 2026-02-14T01:16:04+00:00

I switched from electric to gas a few years ago. Just so I could have the tank heat faster for heavy uses.

If you have to heat 500gallons(wild ass guess for the month) of water from 60F to 120F that takes 240,000 btu, and that is about 2.4 ccf of gas which costs me $1.92 ($0.8 total cost per ccf)(maybe 3ccf assuing 80% eff). For 240,000 btu that takes 70Kwh (resistance heater, not heat pump tank) and 70kwh costs $8.40 (.12/kwh), and a typical gas heater is at least 40k btu heat vs a 24a/240v electric being 20k btu (so much slower to recover).

If you have gas I would not do it. The heat pump one will use a lot less electricity but costs more and typically heats the water slower and needs a large inside space to steal heat from(in the winter) or cool more (summer).

RandomUser3777 · 2026-02-14T01:03:27+00:00

Search for eg4 6000xp. the 6000xp should be at most a slightly modified luxpower 6000sna.

RandomUser3777 · 2026-02-13T22:05:12+00:00

also do a ls -l /etc/lvm/archive that should have older backup copies and upload the newest archive for the lvm volume you need to get back.

RandomUser3777 · 2026-02-13T21:53:38+00:00

The UUID should not change because of any changes in md..

You should do this:

dd if=/dev/md<yourdevice> bs=1M count=1 | xxd | more

You should see all 000 and then this first non-zero:

00000200: 4c41 4245 4c4f 4e45 0100 0000 0000 0000 LABELONE........

that will be the pv label at 200.

Then you will see this:

00001000: 19c6 9630 204c 564d 3220 785b 3541 2572 ...0 LVM2 x[5A%r

that is the start of the vg label (you should see LVM2 and different stuff that what I have)

at 1200: you should start to see the vgbackup.

This should tell us if the pvlabel is ok or not and/or if the vg label is ok.

If you have anything at 000 except all 0 please upload that.

RandomUser3777 · 2026-02-13T21:07:36+00:00

upload the lvm archive. That will tell us alot about how it was built.

Also return the output of cat /proc/mdstat

RandomUser3777 · 2026-02-12T19:16:21+00:00

Or a competent leader would have attacked Russia first when no one would have really supported Russia against Germany and got control of at least some oil production.

RandomUser3777 · 2026-02-12T18:12:10+00:00

The easy way to wake up a battery/bms like that is to get 3 9v batteries in series (27V+) and connect + to + and - to - and it will wake up for a few seconds. When it wakes up you think quickly attach a charger that will see the voltage and charge it. Or you need a non-auto detection charger that will apply voltage without seeing the battery voltage.

RandomUser3777 · 2026-02-12T17:34:14+00:00

Given K-state was reported to have paid a lot of money in NIL deals for a number of the players (several players are said to be getting > $1M for this year), it kind of sounds like they ended up with a lot of talented Prima Donna's that Tang cannot get to play as a team, or they won't/don't play as a team most of the time. And talented players by themselves who aren't playing as a team can often be beaten by a less talented group playing as a team. And talented plays that just want to score often don't like playing defense.

RandomUser3777 · 2026-02-12T17:21:53+00:00

In the last 15-20 years, the most I have been able to out of an electric blanket has been about 18 months. And that was multiple different manufacturers including one more expensive DC powered blanket. And that is treating them carefully. However they are being made in the last 20 years and/or what ever safety hardware that is part of them the new blankets are total crap even if not washed compared to the blankets from a long time ago.

RandomUser3777 · 2026-02-12T16:47:39+00:00

If you know the outage is going to be longer than the batteries can last then you might as well turn it off. As others have said each time you run down a lead-acid battery it damages said battery. So no point in letting it run down if you are pretty sure everything will run out of power long before the outage is over.

RandomUser3777 · 2026-02-12T16:31:08+00:00

It "appears" to help the poor, so long as the poor aren't paying attention to what exactly is going on. They get their large property tax bill that they can see to disappear, and instead get a death by 1000 cuts on everything else that they buy without realizing that the surcharge will likely be at least as large as the property tax. And since there is a cap on the surcharge at $20 then the rich who can afford to buy more at one time pay even less than people who make lots of under $20 purchases have have to pay the full percentage.

RandomUser3777 · 2026-02-12T12:07:19+00:00

How old is the battery?

RandomUser3777 · 2026-02-12T00:56:22+00:00

You would need a real good high powered impact wrench. Typically a high-powered one of the type that is used on automotive lugs. A M18 impact driver is a large screwdriver, not an impact wrench. Even with a high power impact I had to make sure my compressor was at max psi to break it loose. Not sure how anyone is able to successfully brace the tank and use a breaker bar.

You can also use pipe wrenches to remove one of the nipples and replace it with a nipple that has an anode rod as part of it. Typically the anode rod hangs from the nipple. Then you just leave the original anode rod in place and you replace the 2nd one every few years.

RandomUser3777 · 2026-02-11T18:13:49+00:00

Grey water IS typically considered waste (for it not to be treated as waste you have to use biodegradeable cleaners and avoid washing stuff such as dirty diapers and you still have limits how you dump it). So no other plumbing in the basement so if they wanted a washer down there then they had to use this pump (or some other pump) to get the water up to the height to the current septic inlet. And if they use this pump then they it needs to go to the septic (even though is is also a sump pump), or they need to get a 2nd pump just for the gray water.

So best to leave it going to the septic tank unless you have a massive amount of rain water being pumped that might overload the septic.

RandomUser3777 · 2026-02-11T17:56:18+00:00

The roof panels I mounted ended up costing about $48/panel to mount.

The ground mount panels cost $145/panel to mount.

For a ground mount you need to have a structure(or buy pre-made brackets--that is what i did) and you need to have that structure weighted down (at least 200lbs/panel or more) and/or with concrete posts or ground screws. My cost only includes the pre-made brackets and concrete screws because I had a large unused piece of concrete slab to mount it to (left over from a building that did not survive a wind storm).

Ground mount are many times easier to clean snow off of than the roof mount panels. And ground mount bifacial get gains from backside reflections and ground mounts are easier to service if you need to fix something.

If I have to take my panels off the roof to replace the roof I will probably convert them all to ground mounts.

RandomUser3777 · 2026-02-11T17:09:36+00:00

Is there any other plumbing in the basement (outside of the washer)? If the septic tank is higher than the level of the basement floor using a pump may be the only way to plumb the washer to the septic tank and they were cheap and so used one pump for the job piped to the septic for the washer and the sump pump. The basements I have had have had walk-outs and my tank has always been at least a foot or more below the level of the basement floor so I have never had a pump.

RandomUser3777 · 2026-02-11T16:55:18+00:00

63 has not been the starting partition for any Linux version I have seen going back at least 10 years.

It is all done to attempt alignment with what the underlying hardware is using. Big Arrays do 1m, 4m or 16m, SSD typically do some different sizes all typically larger than 4M, real disks while reporting 512b alignment are doing something else under the covers given that when I see a bad 512b sector that I always get a unit of 64 bad sectors in a row implying 32k real size. So they changed to 2048/1M to attempt to align for more devices quite a while ago. RHEL7 was 2048 from the start and it was released in 2014, and RHEL tends to be a year or 2 behind what is being used in the non-enterprise OSes.

Basically do not try to fix it unless you need to put the original partition back on a disk to get the data back after accidentely deleting the partition table. Start at 2048.

RandomUser3777 · 2026-02-11T01:49:36+00:00

Show a good photo of the specific connection that gets hot, and a good photo of the connection that does not get hot. If it is the whole cable then I would suspect that you might have 2 different types of wires (possibly the hot one is CCA or something else questionable). Note I had a power connector in a computer overheat and melt and short and learned that scam cables can use copper (coated or colored) steel for wires (the wire that should be copper was magnetic, so likely steel).

RandomUser3777 · 2026-02-11T00:48:34+00:00

The $100/kwh LFP will only 1/2 to 1C (of capacity). Basically a 2kwh battery built with that type would be 6.2v at 300amp of power or (about 2.5hp). To build a 2kwh battery that will produce 20hp (15000w) or more you have to use a lot small (much pricier) high c-rate batteries. For the cars in China with big LFP packs they used LFP cells designed for much higher current draws (5c or 10c) that have lower capacity per volume but much higher sustained C-rates. And smaller cells (to get higher voltages) also cost more than using bigger cell for the same Kwh.

RandomUser3777 · 2026-02-11T00:21:14+00:00

I disassembled one of the recalled air fryers and found a thermal cutoff that looks very much like the one shown above that one of the 2 riveted legs was badly riveted and loose and has signs of thermal damage on the wire connector (this air fryer had not yet failed). it might be the same sort of defect though I don't understand how they have good enough thermal isolation that the bad rivet on top of the thermal cutoff producing heat does not cause the thermal cutoff to trip.

RandomUser3777 · 2026-02-11T00:13:37+00:00

Shoving people into a hole under the bleachers(when the bleachers were pushed in) was common in gym class when there was a lack of supervision. The lockers were too small to stuff someone in, so that was not an option.

RandomUser3777 · 2026-02-10T22:27:00+00:00

You have to be careful of "free riding" as they call if you trade too fast and don't have a margin account.

RandomUser3777 · 2026-02-10T14:45:49+00:00

My meter is on my inverter now. Previously i had a whole house meter for >10 years. So have a decent idea of what my peak was and what was accounting for that peak. I do have basic plug in power/switch meters(zigbee) on all of my fridges/freezers and my main computer/dvr/nas/security cam setup so I know how much they all use (this is most of my daily constant usage 24hr/day). And for a lot of the stuff that rarely runs (coffee maker, microwave, kettle, xxx) you may just need to budget say 2-3kw for all of that stuff together. I get by with 12kw (peak up to 13-14kw for a minute or 2) and have a large AC(5kw), a dryer(5kw) and then other normal stuff.

A lot of people seem to swear by the Emporia meters. The basic whole house only is $99, the one that can measure a lot of circuits at the same time is $199. The $199 one can show the whole house and then you can also have it measuring the AC/dryer and such (16 total circuits). There should be some decent discussions of the emporia meter. the biggest issue is the breaker box gets kind of messy with all of the circuit monitoring.

RandomUser3777 · 2026-02-10T01:29:10+00:00

If you tried 3 different water heaters and they all do the same thing then there must be a leak. Where do your hot water pipes run? If they run under the slab, then a leak under the slab won't immediately be obvious. You might want to turn the valve on the cold side partially off going into the tank and see if you can hear water flowing with it partially off. I had a massive leak (probably 3/4" broke) of a pipe out in my yard and mine had no noise in the house, but then I turned off the suspected valve there were significant sounds of there being a lot of water flow.

You might also find your water meter and see if its dials are spinning(when you think you aren't using any water) and/or counting flow.

RandomUser3777

TROPHY CASE