JazzMan

Scanner does monitor (e.g. every minute or so, can be configured) SMART data and also regularly (e.g. monthly, depends on your setup choices) scans both the file system and every sector on your drives to check that they are readable, and can attempt repairs.
The scanning as a (nice) side-effect can also prevent some bit rot, as the act of scanning ensures the drive will be regularly fully powered up and that the drive's own detection/correction features will (or at least should) automatically examine/repair/reallocate cells/sectors in the background as Scanner reads them. Note that SSDs are much more susceptible to charge decay than HDDs, as the former relies on a much faster but less stable storage method; it can vary widely by the type of SSD but the  general takeaway is that a SSD/HDD that's been sitting unused for X months/years respectively might not keep your data intact (the bigger the X, the smaller the trust).
Anyway, aside from the problem mentioned with SSDs above, drive-based bit rot (as opposed to other sources and causes, e.g. due to bad RAM, EM spikes, faulty controllers, using non-ECC memory in a system that doesn't get cold-booted regularly, etc) is by itself quite rare, but it is yet another reason to keep backups.
TLDRs: if you keep necessary data on a SSD, I suggest keeping it powered continuously or at least regularly. Regularly scan your SSDs and HDDs. Keep backups. If you're not using an ECC setup, consider disabling "Fast Start" in Windows 10/11 and restarting your PC occasionally (e.g. once a month) if you're not already doing so.

Default pool behaviour is to use whichever drive has the most free space at the time; your "Lightroom" volume has the least free space so unless you change the default behaviour it will be used only after all of the others have enough files placed on them that they all have less free space remaining than it.

If the Windows 10 Fast Startup feature is enabled, which is the default, when you do a normal Shutdown it will snapshot an image of the current kernel, drivers, and system state in memory to disk and then on boot it'll load from the image but if you do a Restart it doesn't take the snapshot and instead performs a Normal Start where it goes through the normal process of loading the kernel, the drivers and system state component-by-component from the boot drive etc.
So if it's the Restart that makes the pool drive unavailable, that would suggest the issue is occurring during the normal full boot process. I'd try looking in DrivePool's Cog->Troubleshooting->Service Log after a Restart fails to make the drive available, to see if there are any clues there - e.g. it might just be something is timing out the find-and-mount routine, in which case you can increase the CoveFs_WaitFor***Ms entries as described in https://wiki.covecube.com/StableBit_DrivePool_2.x_Advanced_Settings until it picks up.
If you're still stuck after looking at the Log, you can request a support ticket via StableBit's contact form.
EDIT: made it clearer that only the CoveFs_WaitFor***Ms entries (i.e. the ones ending in Ms) are to be changed. The wiki mentions CoveFs_WaitForVolumesOnMount without the Ms, that's a deprecated entry that isn't used by newer versions of DrivePool.

YMMV but I wouldn't trust that drive for storing anything particularly precious that wasn't backed up or duplicated elsewhere; chkdsk /r should not BSOD on a good drive. My guesses:
the BSOD happened because the chkdsk ran into the bad sector, tried to recover data from it and the drive behaved in an unexpected way (e.g. maybe it sent back "potato" when the code was only programmed to handle "apple" or "banana"). That's basically what a BSOD is after all - the OS going "something happened that I don't know how to handle, so I'm stopping everything rather than risk making something worse". the drive has either #1 replaced the bad sector with a spare from a reserve that the drive doesn't count as a reallocation (according to the drive manufacturer anyway), #2 performed its own internal repair of the sector and satisfied itself that the sector is no longer bad, or #3 zeroing the sector didn't trip the problem, so as far as it cares all is well in drive land. Anyway glad you haven't lost anything!

Click on the affected drive in Scanner. Then click on the plus sign next to it. If any part of the disk is grey instead of green or red, click the Start Check button on the left (hover over the buttons to see the tooltips if needed) so that it can complete scanning (this can take a long while). Once all of the disk is colored there should be three green ticks below (indicating the disk is now healthy), however if there is a red cross instead of the first green tick click the underlined text beside it. This should bring up the File Scan window. Start the file scan to proceed with checking for damaged files and attempting to recover them.
https://stablebit.com/Support/Scanner/2.X/Manual?Section=File Recovery
Note: after you've used Scanner to run file recovery, if the disk is still complaining and you want to force the disk to go ahead and confirm the unused sector as good/bad, open a command prompt and run the command "chkdsk driveletter: /r" as an administrator (where driveletter is the drive letter of the affected drive). This will take a considerable amount of time however.
 

I just did this, no problem. You should just be able to install DP, migrate or buy a new license, attach the drives and DP should recognize the pool.
 
Someone else may know a few caveats like perhaps if you have complex duplication, placement, and balancing rules.

I just did this, no problem. You should just be able to install DP, migrate or buy a new license, attach the drives and DP should recognize the pool.
 
Someone else may know a few caveats like perhaps if you have complex duplication, placement, and balancing rules.

I bought the Q30 including the mobo, raid card and power supply from them.  They list a few sample configurations on their site, and have a configurator for more choices, but when I dealt with them they were super flexible in working with each clients' specific needs.  The configurator can be a starting point but then you can order off the menu.  In my use case I wanted a different CPU than what they had on the configuraator; they could not source the specific one I asked for but understood my requirements and suggested an appropriate alternative they could source.
 
You can check out these articles if you are not familiar with storage pods;
https://www.extremetech.com/computing/178757-how-to-build-your-own-180tb-raid6-storage-array-for-9305
https://www.backblaze.com/blog/open-source-data-storage-server/
or search the web for something like "backblaze storage pod" and maybe add "open source" if you really are interested in just acquiring a case from a metal shop and not all the internals.
 
For some history as I understand it;
45Drives was an early supplier to BackBlaze but is no longer.  I think BackBlaze is up to version 6 or higher of the pod.  Around version 4 or so, BackBlaze switched to BackupPods.com and possibly others as suppliers of the pods.  However the pod designs are open source and can be bought and put together from a parts list if one desires.
 
I needed something that arrived working and was not a server build learning experience, so I bought a system assembled and tested sans drives.  I then just dropped my drives in, installed Win 7 and DP and was basically ready to go.  Most drives were moved from some other computers, one of which had been running DP, and I added a few blank drives, so I did have to move some files around to get them into the new pool and duplicated properly. 
 
http://www.45drives.com/
https://www.backuppods.com/
http://protocase.com/products/electronic-enclosures/45drives-storage-pods.php
 
My perhaps faulty recollection was that 45Drives wouldn't necessarily sell you all the nuts and bolts and individual parts one by one like at Radio Shack of old but would be very flexible in putting together (or leaving out) the major electronic components that go into a server to a clients' needs, and that BackupBods was the opposite on either ends of that;.they would either sell you a completely built working machine with all the drives and little customization, or they would sell you all the nuts and bolts and individual parts a la carte to assemble yourself.
 
I'd contact both companies and explain what you are looking for. (metal case, metal case with backplanes, etc.)  Protocase is the metal fab shop for 45Drives, so if you really are just interested in the chassis and not the backplanes, etc, you could contact them.
 
This info may have changed in the past 1.5 years.
 
Cheers,
David

I bought the Q30 including the mobo, raid card and power supply from them.  They list a few sample configurations on their site, and have a configurator for more choices, but when I dealt with them they were super flexible in working with each clients' specific needs.  The configurator can be a starting point but then you can order off the menu.  In my use case I wanted a different CPU than what they had on the configuraator; they could not source the specific one I asked for but understood my requirements and suggested an appropriate alternative they could source.
 
You can check out these articles if you are not familiar with storage pods;
https://www.extremetech.com/computing/178757-how-to-build-your-own-180tb-raid6-storage-array-for-9305
https://www.backblaze.com/blog/open-source-data-storage-server/
or search the web for something like "backblaze storage pod" and maybe add "open source" if you really are interested in just acquiring a case from a metal shop and not all the internals.
 
For some history as I understand it;
45Drives was an early supplier to BackBlaze but is no longer.  I think BackBlaze is up to version 6 or higher of the pod.  Around version 4 or so, BackBlaze switched to BackupPods.com and possibly others as suppliers of the pods.  However the pod designs are open source and can be bought and put together from a parts list if one desires.
 
I needed something that arrived working and was not a server build learning experience, so I bought a system assembled and tested sans drives.  I then just dropped my drives in, installed Win 7 and DP and was basically ready to go.  Most drives were moved from some other computers, one of which had been running DP, and I added a few blank drives, so I did have to move some files around to get them into the new pool and duplicated properly. 
 
http://www.45drives.com/
https://www.backuppods.com/
http://protocase.com/products/electronic-enclosures/45drives-storage-pods.php
 
My perhaps faulty recollection was that 45Drives wouldn't necessarily sell you all the nuts and bolts and individual parts one by one like at Radio Shack of old but would be very flexible in putting together (or leaving out) the major electronic components that go into a server to a clients' needs, and that BackupBods was the opposite on either ends of that;.they would either sell you a completely built working machine with all the drives and little customization, or they would sell you all the nuts and bolts and individual parts a la carte to assemble yourself.
 
I'd contact both companies and explain what you are looking for. (metal case, metal case with backplanes, etc.)  Protocase is the metal fab shop for 45Drives, so if you really are just interested in the chassis and not the backplanes, etc, you could contact them.
 
This info may have changed in the past 1.5 years.
 
Cheers,
David

This is the machine I use Stablebit DrivePool on.  It is not strictly a "server" as it gets used for workstation tasks as well and thus has a desktop, not server, OS.
 
Case: 45Drives Storinator Q30
OS: Windows 7 Pro 64-Bit
CPU: Intel Xeon E3 1275v2
MoBo: SuperMicro X95CM
RAM: 2x8GB ECC
GFX: NVidia GeForce GT 710
PSU: Corsair HX750i
OS Drive: SanDisk X300 128GB SSD
Storage Pools:
  142 TB:
    10x 4TB (WD40EZRX)
    14x 6TB (WD60EZRX)
    4x 8TB (WD80EFZX)
    ~ About 3.5 million files (7 million with x2 duplication)
  18.2 TB:
    2x 10TB (ST10000VN0004)
     ~ About 155,500 files (311,000 with x2 duplication)
  * Pool sizes as reported by DP.
    Drive sizes as marketed.
    Both pools configured with x2 full pool duplication.
Misc Storage: 750 GB (WD7500BPVT)
HDD Controller card: HighPoint Rocket 750

 

Is it possible to reorder the way the pools appear in the UI and/or the order in which they are measured?
 
At the moment my large G Pool is listed first in the UI and is re-measured first whenever is considered inconsistent.
 
I'd like my smaller D pool to be first in the UI and "Next Pool" would take me to the G pool.  D is more important, would re-measure quicker, and D comes before G in the alphabet.
 
Thanks,
David

Yes, if you have whole disk duplication turned on, the effective useable space is half the raw space.  The advantage to this, though, is that you have an automatic immediate online backup and don't have to deal with all the stories you see about parity based RAID arrays not rebuilding or taking a week to rebuild.  The other advantage is being able to include a mixture of drives of any size.
 
You can also configure to duplicate only certain folders also, though, so if there was a lot of temp work in the pool or something you could survive losing, you can exclude those folders from duplication.