Date: Sat, 09 Apr 2011 21:27:41 -0700 From: Chris Telting <christopher-ml@telting.org> To: freebsd-questions@freebsd.org Subject: ZFS Striping and Optimizing Capabilities Message-ID: <4DA131BD.3030805@telting.org>
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Just a few questions about what ZFS actually does. So if anyone has intimate knowledge about ZFS's implementation on Freebsd I'm sure I and others would appreciate the answers. When you add a second and or thrid drive/partition to a zpool I'm assuming that it's going to start using the drives like a raid 0 stripe. How do the ZFS versions differ in this? Does it immediately start striping all files in the background on low priority or does it do it as files are accessed? Does ZFS in any way do performance testing of read/right operating in light of where the data is stored on the drive? i.e. the outside sectors of hard drives perform faster. If it does do read/write location testing can it be shut off or does it detect SSDs? What about tracing application sector reading and reordering sectors so that they follow one another according to typical usage? i.e. the sectors are already in the linear read ahead buffer? I appreciate any answers, Chris
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