[OpenIndiana-discuss] Good SLOG devices?

wessels wessels147 at gmail.com
Wed Mar 2 12:54:00 UTC 2011

True, but a harddisk doesn't lie about a write. When a write is done
the data is on stable storage. Most SSD don't have it on stable
storage (yet) when they complete a write.
So if your power fails and you're using harddisks than the write
command indeed doesn't complete but the harddisk didn't respond that
the write was completed so the writer, and that may even be a remote
nfs client for example, doesn't get a write complete. Whereas the SSD
would have responded that the write was completed and the writer would
assume that the data was on stable storage when in fact it wasn't.

On Wed, Mar 2, 2011 at 1:06 PM, Dmitry G. Kozhinov <dima at desktopfay.com> wrote:
> If power fails, it fails for HDD also. No matter you have or not power cell
> in cache device, write operations cannot be completed.
> On 02.03.2011 12:52, Ivar Janmaat wrote:
>> X-25E does not have  a power cell onboard to complete operations if power
>> fails
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