> > > At least to me, this was not clearly "not asking about losing zil" and was > not clearly "asking about power loss." Sorry for answering the question > you > thought you didn't ask. >
I was only responding to your response of WRONG!!! The guy wasn't wrong in regards to my questions. I'm sorry for not making THAT more clear in my post. > > I would suggest clarifying your question, by saying instead: "so lets' say > *power*loss occurs" Then it would have been clear what you were asking. > > I'm pretty sure i did ask about power loss....or at least it was implied by my point about the UPS. You're right, i probably should have been a little more clear. > Since this is a SSD you're talking about, unless you have enabled > nonvolatile write cache on that disk (which you should never do), and the > disk incorrectly handles cache flush commands (which it should never do), > then the supercap is irrelevant. All ZIL writes are to be done > synchronously. > > This SSD doesn't use nonvolatile write cache (at least i don't think it does, it's a SF-1500 based ssd) I might be wrong about this, but i thought one of the biggest things about the sandforce was that it doesn't use DRAM > If you have a power loss, you don't lose your pool, and you also don't lose > any writes in the ZIL. You do, however, lose any async writes that were > not > yet flushed to disk. There is no way to prevent that, regardless of ZIL > configuration. > Yes, I know that i lose async writes....i just wasn't sure if that resulted in an issue...I might be somewhat confused to how the ZIL works but i thought the point of the ZIL was to "pretend" a write actually happened when it may not have actually been flushed to disk yet...in this case, a write to the zil might not make it to disk....i just didn't know if this could result in a loss of a pool due to some sort of corruption of the uberblock or something.....I'm not entirely up to speed on the voodoo that is ZFS. I wasn't trying to be rude, sorry if it came off like that. I am aware of the issue regarding removing the ZIL on non-dev versions of opensolaris....i am on b134 so that doesnt' apply to me. Thanks
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