> From everything I've seen, an SSD wins simply because it's 20-100x the
> size. HBAs almost never have more than 512MB of cache, and even fancy
> SAN boxes generally have 1-2GB max. So, HBAs are subject to being
> overwhelmed with heavy I/O. The SSD ZIL has a much better chance of
> being able to
Hi, Erik,
I've always wondered what the benefit (and difficulty to add to ZFS) would
> be to having an async write cache for ZFS - that is, ZFS currently buffers
> async writes in RAM, until it decides to aggregate enough of them to flush
> to disk. I think it would be interesting to see what woul
Edward Ned Harvey wrote:
In this email, when I say PERC, I really mean either a PERC, or any
other hardware WriteBack buffered raid controller with BBU.
For future server purchases, I want to know which is faster: (a) A
bunch of hard disks with PERC and WriteBack enabled, or (b) A bunch of
