Re: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?)

2000-06-30 Thread Toby Dickenson
On Thu, 29 Jun 2000 17:19:32 -0400, Shane Hathaway [EMAIL PROTECTED] wrote: Quite simply, Data.fs is appended, not modified, except during a pack operation. Think of it like a binary log file. Therefore there are only two ways a simple, live backup of Data.fs can fail: 1) You do the copy in

RE: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?)

2000-06-29 Thread Wilkinson Charlie E
Title: RE: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?) Just to start by pointing out the bloody obvious: - Restoring from backup means you lose all data between backup date/time and system failure. Sucks, but it beats losing *all* your data. (RAID5 anyone?) - With that in mind

RE: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?)

2000-06-29 Thread Jeff K. Hoffman
On Thu, 29 Jun 2000, Wilkinson Charlie E wrote: Another random thought is that if ZODB transactions and writes are atomic, than none of this should be an issue. Anyone know the answer to that one? It is my understanding that the ZODB on disk is always in a consistent state; Jim has said, in

RE: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?)

2000-06-29 Thread Erik Enge
On Thu, 29 Jun 2000, Jeff K. Hoffman wrote: It is my understanding that the ZODB on disk is always in a consistent state; Jim has said, in the past, that you can simply make a copy of Data.fs, even while Zope is running, without problems. But the Data.fs has to be updated sometimes. And if

Re: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?)

2000-06-29 Thread Bill Anderson
Wilkinson Charlie E wrote: Just to start by pointing out the bloody obvious: - Restoring from backup means you lose all data between backup date/time and system failure. Sucks, but it beats losing *all* your data. (RAID5 anyone?) A) Please: no html! B) I just had one weird and

RE: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?)

2000-06-29 Thread Jeff K. Hoffman
On Thu, 29 Jun 2000, Erik Enge wrote: On Thu, 29 Jun 2000, Jeff K. Hoffman wrote: It is my understanding that the ZODB on disk is always in a consistent state; Jim has said, in the past, that you can simply make a copy of Data.fs, even while Zope is running, without problems. But the

RE: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?)

2000-06-29 Thread Wilkinson Charlie E
Title: RE: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?) -Original Message- From: Erik Enge [mailto:[EMAIL PROTECTED]] On Thu, 29 Jun 2000, Jeff K. Hoffman wrote: It is my understanding that the ZODB on disk is always in a consistent state; Jim has said

RE: [Zope] Backing Up Zope (was: Re: [Zope] Data.fs.lock?)

2000-06-29 Thread Erik Enge
On Thu, 29 Jun 2000, Wilkinson Charlie E wrote: This would be consistent with "atomic updates." What it means is that a transaction is not written to the Data.fs file until it has completed, and when it is finally written out, it's done as an atomic operation, i.e. at the system level it is