| From: | Ben Chobot <bench(at)silentmedia(dot)com> |
|---|---|
| To: | Merlin Moncure <mmoncure(at)gmail(dot)com> |
| Cc: | "pgsql-performance(at)postgresql(dot)org Performance" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Question: BlockSize > 8192 with FusionIO |
| Date: | 2011-01-04 18:36:53 |
| Message-ID: | 76129DB3-3413-4342-BAF0-CE27BD67CA78@silentmedia.com |
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| Thread: | |
| Lists: | pgsql-performance |
On Jan 4, 2011, at 8:48 AM, Merlin Moncure wrote:
>
> most flash drives, especially mlc flash, use huge blocks anyways on
> physical level. the numbers claimed here
> (http://www.fusionio.com/products/iodrive/) (141k write iops) are
> simply not believable without write buffering. i didn't see any note
> of how fault tolerance is maintained through the buffer (anyone
> know?).
FusionIO buffers. They have capacitors onboard to protect against crashing and power failure. They passed our crash attempts to corrupt writes to them before we put them into production, for whatever that's worth, but they do take a long time to come back online after an unclean shutdown.
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