Andrew Bourgeois:
> But what does "persistent write cache" mean? What needs to be changed on
> the OS level? Google doesn't clearly link "persistent write cache" to a
> Linux feature.

It is a hardware feature found in RAID controllers and in server
I/O accelerators. The basic idea is to serialize random writes.
SSHD disks may provide similar improvements with random I/O.

        Wietse

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