On Mon, Jan 19, 2009 at 1:12 PM, Bob Friesenhahn < bfrie...@simple.dallas.tx.us> wrote:
> On Mon, 19 Jan 2009, Adam Leventhal wrote: > >> >> Are you telling me zfs is deficient to the point it can't handle basic >>> right-sizing like a 15$ sata raid adapter? >>> >> >> How do there $15 sata raid adapters solve the problem? The more details >> you >> could provide the better obviously. >> > > It is really quite simple. If the disk is resilvered but the new drive is > a bit too small, then the RAID card might tell you that a bit of data might > have lost in the last sectors, or it may just assume that you didn't need > that data, or maybe a bit of cryptic message text scrolls off the screen a > split second after it has been issued. Or if you try to write at the end of > the volume and one of the replacement drives is a bit too short, then the > RAID card may return a hard read or write error. Most filesystems won't try > to use that last bit of space anyway since they run real slow when the disk > is completely full, or their flimsy formatting algorithm always wastes a bit > of the end of the disk. Only ZFS is rash enough to use all of the space > provided to it, and actually expect that the space continues to be usable. > > It's a horribly *bad thing* to not use the entire disk and right-size it for sanity's sake. That's why Sun currently sells arrays that do JUST THAT. I'd wager fishworks does just that as well. Why don't you open source that code and prove me wrong ;) I'm wondering why they don't come right out with it and say "we want to intentionally make this painful to our end users so that they buy our packaged products". It'd be far more honest and productive than this pissing match. --Tim
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