JorgeB

Yes, using a single link to the HBA you'll have 20 on the expander + 4 on the HBA's other port.

It should comeback fine and most likely without the error

Unfortunate even the complete syslog on the diags rotated and oldest entry is from July 22 but already shows the same error, we need to see the beginning of the syslog and when the error started, so reboot and if/when the error comes back grab and post new diags.

Please post your diagnostics: Tools -> Diagnostics

I usually prefer testing in real world situations, i.e., by copying/reading files to the pool, but if you're more interest in raw speeds you can use dd, google dd speed test.

Thought, a 3 NVMe raid1 pool might perform better than a 4 SSD raid10 pool, depending on the devices used.

It would be the best option for both speed and redundancy, if you can use 4 devices.

Most raid5/6 issues are resolved now, but it suffers from the write hole problem that affects almost all raid5/6 setups. 3 is not a good number, you'd need 4 for raid10, so assuming regular backups probably would use raid0 (with raid1 for metadata)

Or an active SSH session to /mnt/something

Yes, it's the same as the 9211-8i, just the miniSAS ports orientation is different.

9201-16i 9300-16i

That's a RAID chipset, not recommended for unRAID, you want a plain HBA, any LSI with a SAS2008/2308/3008 chipset in IT mode, e.g., 9201-8i, 9211-8i, 9207-8i, 9300-8i, etc and clones, like the Dell H200/H310 and IBM M1015, these latter ones need to be crossflashed.

It's a common problem with USB enclosures, AFAIK no way around that.

This thread might help.

system/lsscsi.txt

You don't: HP SAS EXP Card 2.06 You just need to be at least on v1.52

Something wrong with your browser them links are correct, but here it is: How do I replace/upgrade my single cache device? (unRAID v6.2 and above only) This procedure assumes that there are at least some dockers and/or VMs related files on the cache disk, some of these steps are unnecessary if there aren't. Stop all running Dockers/VMs Settings -> VM Manager: disable VMs and click apply Settings -> Docker: disable Docker and click apply Click on Shares and change to "Yes" all cache shares with "Use cache disk:" set to "Only" or "Prefer" Check that there's enough free space on the array and invoke the mover by clicking "Move Now" on the Main page When the mover finishes check that your cache is empty (any files on the cache root will not be moved as they are not part of any share) Stop array, replace cache device, assign it, start array and format new cache device (if needed), check that it's using the filesystem you want Click on Shares and change to "Prefer" all shares that you want moved back to cache On the Main page click "Move Now" When the mover finishes re-enable Docker and VMs

That's not what the instructions say, just follow them.

Post your diagnostics, most expanders firmware is visible there.

https://lime-technology.com/forums/topic/46802-faq-for-unraid-v6/?do=findComment&comment=480419 or https://lime-technology.com/forums/topic/46802-faq-for-unraid-v6/?do=findComment&comment=511923

Is current cache btrfs or xfs?

Either three HBAs or one and a SAS expander, recommended HBAs are any LSI with a SAS2008/2308/3008 chipset in IT mode, e.g., 9201-8i, 9211-8i, 9207-8i, 9300-8i, etc and clones, like the Dell H200/H310 and IBM M1015, these latter ones need to be crossflashed.

Never saw that before.

I missed that there's no bracket, IMO it would be best to get a bracket, it should be easy to get one on ebay, the adapter is another possible point of failure.