Re: [ZODB-Dev] HA Setup and zodb index file of FileStorage

2006-09-27 Thread Chris Withers
Patrick Gerken wrote: You run your live Data.fs off a SAN? That usually makes for interesting performance problems in the best case! Well, yes, that is/was the idea when suddenly HA requests popped up. You might be right, Painful experience has taught me that I am ;-) need to access many

Re: [ZODB-Dev] HA Setup and zodb index file of FileStorage

2006-09-27 Thread Chris Withers
Dieter Maurer wrote: Why do you think so? Almost everything is run off SANs. Why should Data.fs make a problem? Under high load, an awful lot of data is read from this file. SANs have higher latency than local disks. In some apps this can make a noticeable performance difference. cheers,

Re: [ZODB-Dev] HA Setup and zodb index file of FileStorage

2006-09-26 Thread Patrick Gerken
On 9/25/06, Chris Withers [EMAIL PROTECTED] wrote: Patrick Gerken wrote: system with ZEO for an ERP5 deployment. In my case I don't need to care for data replication, all is stored on a SAN considered HA by the customer already. You run your live Data.fs off a SAN? That usually makes for

Re: [ZODB-Dev] HA Setup and zodb index file of FileStorage

2006-09-25 Thread Chris Withers
Patrick Gerken wrote: system with ZEO for an ERP5 deployment. In my case I don't need to care for data replication, all is stored on a SAN considered HA by the customer already. You run your live Data.fs off a SAN? That usually makes for interesting performance problems in the best case! So

Re: [ZODB-Dev] HA Setup and zodb index file of FileStorage

2006-09-22 Thread Patrick Gerken
On 9/22/06, Christian Theune [EMAIL PROTECTED] wrote: Hi, Patrick Gerken wrote: Hello, its funny, like Garth in may this year I am looking into making a HA system with ZEO for an ERP5 deployment. In my case I don't need to care for data replication, all is stored on a SAN considered HA by

Re: [ZODB-Dev] HA Setup and zodb index file of FileStorage

2006-09-22 Thread Jim Fulton
On Sep 22, 2006, at 2:48 AM, Christian Theune wrote: ... One of the last things I remember is that indexes can not be rebuilt partially but are rebuilt completely. If the existing index is valid, then only new data are read if it isn't current. I think this is what Patrick was referring

Re: [ZODB-Dev] HA Setup and zodb index file of FileStorage

2006-09-22 Thread Dieter Maurer
Patrick Gerken wrote at 2006-9-22 10:17 +0200: ... Even the first checkin of the filestorage makes a self.read_index(...start = start...) which updates the index from the oldest tid known to the index. I can only imagine that the index gets invalidated if the self._check_sanity() returns 0 thus

Re: [ZODB-Dev] HA Setup and zodb index file of FileStorage

2006-09-21 Thread Christian Theune
Hi, Patrick Gerken wrote: Hello, its funny, like Garth in may this year I am looking into making a HA system with ZEO for an ERP5 deployment. In my case I don't need to care for data replication, all is stored on a SAN considered HA by the customer already. So my data.fs and index and