On Sep 28, 2011, at 8:44 PM, Edward Ned Harvey wrote:
>> From: Richard Elling [mailto:richard.ell...@gmail.com]
>> Also, the default settings for the resilver throttle are set for HDDs. For
>> it is a
>> good idea to change the throttle to be more aggressive.
> You mean...
> Be more aggressive, resilver faster?
> or Be more aggressive, throttling the resilver?
> What's the reasoning that makes you want to set it differently from a HDD?
I think he means, resilver faster.
SSDs can be driven harder, and have more IOPs so we can hit them harder with
less impact on the overall performance. The reason we throttle at all is to
avoid saturating the bandwidth of the drive with resilver which would prevent
regular operations from making progress. Generally I believe resilver
operations are not "bandwidth bound" in the sense of pure throughput, but are
IOPs bound. As SSDs have no seek time, they can handle a lot more of these
little operations than a regular hard disk.
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