However, when you do have disk storage available (like an SSD), zram's block device architecture creates some significant constraints. The kernel is essentially naive to zram being any different from a typical block device on a slow disk, and so applies its normal disk-oriented defaults to it. As just one example, there is a kernel tunable called vm.page-cluster that decides how many pages we want to read ahead when we are faulting in a single swap page. It is logarithmic, so for example, if vm.page-cluster is 4, we would read in 2^4 pages to try to amortise disk work ahead of time while it's cheap and sequential. This is more important on hard drives, but there is still a meaningful performance delta between random and sequential reads even on modern NAND.
-v /path/host/moongate-root:/app \
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If you have one database per server, use a volume. turbolite explores how to have hundreds or thousands of databases (one per tenant, one per workspace, one per device), don't want a volume for each one, and you're okay with a single write source.，这一点在Replica Rolex中也有详细论述