Here are the reasons that I know of to keep GCs and Exchange servers separate:
-GCs can create a relatively high amount of replication traffic, depending on your forest topology -a GC on the Exchange server adds not only the DC and GC replication loads, but will also service all functions normally done by GCs and DCs, therefore increasing the load of non-Exchange functions -Too many eggs in too few baskets -There isn't enough of a tangible speed benefit for having it colocated vs. on the same LAN segment. The new DSAccess code with SP2 makes Exchange's use of GCs much more intelligent than before, although you're correct that you cannot specify specific percentages. I don't consider this a big issue, however. Additionall, you're asking for pain, and lots of other issues, if you're planning on having thousands of users on single processor Exchange servers. Further adding domain controller and global catalog functions to those same servers is downright masochistic. Roger ------------------------------------------------------ Roger D. Seielstad - MCSE Sr. Systems Administrator Inovis - Formerly Harbinger and Extricity Atlanta, GA > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:omatesti@;jippii.fi] > Sent: Monday, November 04, 2002 5:27 PM > To: Exchange Discussions > Subject: RE: Exchange 2000 and GC > > > Thanks for your comments, but still a little sad. I have > received lot of > recommends. But unfortunately nobody has denied my idea neither > mentioned any reason why it is recommend to separate GCs and E2k's. > > I don't know what are you thinking about E2k, but somehow its > one of the > biggest lack is its relation to GCs. I haven't noticed any > ways to make > load 'balancing' between GCs (except DNS round-robin). For > example, if I > have three different GC servers: > a) good > b) a little better than good > c) great > How I can show to my two servers that in mainly use server > 'c', but put > 30% of requests to 'b' and 20% to 'a'. > > On the other hand; if I have 20 old servers (but enough for > GCs) and one > big exchange server. How I can tell to E2k to use all of these 20 GC > servers. > > One information what has been also missing (and what I have tried to > search) is user profiles in sentence: > 1 GC (1 x cpu) for 4 E2k (1 x cpu) > If the users are sleeping almost all days is that still correct ? > > But it seems that there is no environment where GC and E2k > are sitting > on the same servers (except small offices). > > .-Pepi-. > > > > General recommendation is to keep Exchange off your domain > controllers, in > > all but the smallest environments. It sounds like you're > well beyond small > > environments, so that's a good start. > > > > The best estimator I've seen is to use a 4-to-1 ratio of > CPUs in Exchange to > > GCs. So, 4 Exchange servers with 4 processors each would be > 16 processors, > > therefore needing 4 processors of GC. > > > > I'd find the scenario of 4 single processor Exchange > servers hosting a large > > number of users each to be scary at best. > > > > ------------------------------------------------------ > > Roger D. Seielstad - MCSE > > Sr. Systems Administrator > > Inovis - Formerly Harbinger and Extricity > > Atlanta, GA > > > > > > > -----Original Message----- > > > From: Petri [mailto:omatesti@;jippii.fi] > > > Sent: Thursday, October 31, 2002 12:08 PM > > > To: Exchange Discussions > > > Subject: Exchange 2000 and GC > > > > > > > > > Hi Folks, > > > > > > I have plans to create almost a big Exchange 2000 > > > environment. And I have > > > some open question where I need more a real life answers > than MS-white > > > papers. > > > > > > At first I will create own AD site for Exchange 2000, so > > > users logons will > > > go other sites. Also I thought to install GCs on the same > servers than > > > Exchanges are. I haven't seen any good answers we should I > > > not to do this. > > > Backup/recovery might be one and if I have problems with GC, > > > but still... > > > > > > But if I use GCs on the same server, then I might have better > > > performance > > > from GC, less users and only one Exchange per GC. Maybe I > > > need one server > > > more to decrease user counts on one server, but it should not > > > be so big. > > > So I don't need so much hardware. And now it is very easy to > > > dedicate one > > > GC per one Exchange 2000 servers. > > > > > > If I use separated GC servers: > > > MS recommends using one CPU in GC against four Exchange > servers, which > > > have one CPU. This sounds like no matter how many users we > > > will have in > > > Exchange servers ? If I have eight servers where are 10 users > > > in each one. > > > Do I still need two GC servers (assuming that servers are one CPU > > > servers). > > > > > > Is here anyone who have more than ~3500 users per server > which is not > > > clustered ? May I hear any comments from you, how it really > > > works ? How > > > often you are rebooting your servers or unmounting databases > > > ? Was it SLA > > > your only argument when you planned storage groups and databases ? > > > > > > > > > best regards > > > .-Pepi-. > > > > > > > > > _________________________________________________________________ > > > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > > > Archives: http://www.swynk.com/sitesearch/search.asp > > > To unsubscribe: mailto:leave-exchange@;ls.swynk.com > > > Exchange List admin: [EMAIL PROTECTED] > > > > > > > _________________________________________________________________ > > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > > Archives: http://www.swynk.com/sitesearch/search.asp > > To unsubscribe: mailto:leave-exchange@;ls.swynk.com > > Exchange List admin: [EMAIL PROTECTED] > > __ > Ota itsellesi luotettava kotimainen email http://www.jippii.fi/ > Tutustu samalla netin parhaaseen pelipaikkaan JIPPIIGAMESIIN. > > > _________________________________________________________________ > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > Archives: http://www.swynk.com/sitesearch/search.asp > To unsubscribe: mailto:leave-exchange@;ls.swynk.com > Exchange List admin: [EMAIL PROTECTED] > _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:leave-exchange@;ls.swynk.com Exchange List admin: [EMAIL PROTECTED]
