[linux-lvm] cache on SSD makes system unresponsive

[Xen]

Oleg Cherkasov schreef op 19-10-2017 19:54:

> Any ideas what may be wrong?

All I know myself in the past have tried to cache an embedded encrypted 
LVM in a regular home system.

The problem was probably caused by the SSD not clearing write caches 
fast enough but I too got some 2 minute "hanging process" outputs on the 
console.

So it was probably a queueing issue within the kernel and might not have 
been related to the cache,

but I'm still not sure if there wasn't an interplay at work.

The main cause was a way too slow SSD but at the same time... that sorta 
thing still shouldn't happen, locking up the entire system.

I haven't had a chance to try again with a faster SSD.

Regards...