| From: | Karl Denninger <karl(at)denninger(dot)net> |
|---|---|
| To: | Greg Smith <greg(at)2ndquadrant(dot)com> |
| Cc: | Robert Schnabel <schnabelr(at)missouri(dot)edu>, Robert Haas <robertmhaas(at)gmail(dot)com>, cb <cb(at)mythtech(dot)net>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Is Diskeeper Automatic Mode safe? |
| Date: | 2009-11-16 20:20:29 |
| Message-ID: | 4B01B40D.80901@denninger.net |
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| Lists: | pgsql-performance |
Greg Smith wrote:
> Robert Schnabel wrote:
>> Nope. Forgive my ignorance but isn't that what a UPS is for anyway?
>> Along with a BBU controller.
> If you have a UPS *and* a BBU controller, then things are much
> better--those should have a write cache that insulates you from the
> worst of the problems. But just a UPS alone doesn't help you very much:
A UPS is just a controlled shutdown device for when things are working
and mains power goes off.
Note the "when things are working" qualifier. :)
-- Karl
| Attachment | Content-Type | Size |
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| karl.vcf | text/x-vcard | 124 bytes |
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