On Sep 28, 2011, at 8:44 PM, Edward Ned Harvey wrote: >> From: Richard Elling [mailto:[email protected]] >> >> Also, the default settings for the resilver throttle are set for HDDs. For > SSDs, >> 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. - Garrett > > _______________________________________________ > zfs-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
