That's good info on the ESE brain cramps. I'm sure that'll rear it's head as these drives become more prevalent.
- WJR On Fri, Jul 29, 2011 at 12:16, Ben Scott <[email protected]> wrote: > On Thu, Jul 28, 2011 at 10:33 PM, Mike Gill <[email protected]> > wrote: > > Don’t know anything about this yet, but couldn’t you just wipe it and > > install Win7 fresh or from a prepared image? Or is this a hardware issue? > > It's a little of both. From what I've read: > > PC hard disks have used 512 byte blocks since the dawn of time > (defined on the PC platform as 1 Jan 1980). With modern ginormous > files and drives, that's inefficient, so they're switching to 4 KiB > blocks. Since a lot of hardware and software isn't compatible with > that, the industry has come up with something called "512 byte block > emulation", or "512e". This presents 512 byte blocks to the host, but > the drive still uses 4 KiB blocks internally. As a result, you pay a > performance penalty if the host does I/O that doesn't fall neatly on a > 4 KiB boundary. It will still work, but the emulation layer has to > perform two block I/O ops where the host only asked for one. By > aligning one's partitions on 4 KiB boundaries, you avoid the > performance hit. Or so I'm given to understand. > > There are also a bunch of weird complications. For example, ESE > (the Microsoft database engine that powers Exchange, Active Directory, > and more) apparently has a fatal brain cramp if the block size of the > disk changes vs what it was at creation. So if you move from one disk > to another, everything using ESE explodes. There's a hotfix for that. > > "If builders built buildings the way programmers write programs, > then the first woodpecker that came along would have destroyed > civilization." (origin unknown) > > -- Ben > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin
