RE: DAG and CAS-Array (or CAS server)
Of course, How could they allow such a config if the moment you failed one db over it would error? That would be total breakage. From: Jay Kulsh [jayku...@csi.com] Sent: Thursday, March 08, 2012 3:33 AM To: MS-Exchange Admin Issues Subject: RE: DAG and CAS-Array (or CAS server) >Name Server MasterServerOrAvailabilityGroup RpcClientAccessServer -- - - >HA-Mailbox-01 EXMB-01 DAG-01 EXCAS-01.italy.local >HA-Mailbox-02 EXMB-01 DAG-01 EXCAS-02.italy.local Joseph, Thanks for testing this, but it only shows that you can have 2 different CAS servers for 2 different databases on one Exchange server. So your setup is testing just one site, in fact just one server. My question is about accessing a DAG -- which spans 2 sites -- from CAS servers on two different sites at the same time. Can that be done? Thanks. Jay --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
RE: DAG and CAS-Array (or CAS server)
Yes that is fine. The CAS or CAS array is specified at a Database level, not a DAG level. You could have 2 CAS arrays access 1 DAG that spans multiple sites. You could have 1 CAS server for each database if you wanted to.. You could have lots of DAGs and one CAS array. Steve -Original Message- From: Jay Kulsh [mailto:jayku...@csi.com] Sent: 08 March 2012 10:34 To: MS-Exchange Admin Issues Subject: RE: DAG and CAS-Array (or CAS server) >Name Server MasterServerOrAvailabilityGroup RpcClientAccessServer -- - - >HA-Mailbox-01 EXMB-01 DAG-01 EXCAS-01.italy.local >HA-Mailbox-02 EXMB-01 DAG-01 EXCAS-02.italy.local Joseph, Thanks for testing this, but it only shows that you can have 2 different CAS servers for 2 different databases on one Exchange server. So your setup is testing just one site, in fact just one server. My question is about accessing a DAG -- which spans 2 sites -- from CAS servers on two different sites at the same time. Can that be done? Thanks. Jay --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
RE: DAG and CAS-Array (or CAS server)
You can only have one RPCClientAccessServer on a database. That can be a single CAS, or multiple CASes referenced by the name of a CAS Array. -Original Message- From: bounce-9494884-8066...@lyris.sunbelt-software.com [mailto:bounce-9494884-8066...@lyris.sunbelt-software.com] On Behalf Of Jay Kulsh Sent: 08 March 2012 10:34 To: MS-Exchange Admin Issues Subject: RE: DAG and CAS-Array (or CAS server) >Name Server MasterServerOrAvailabilityGroup RpcClientAccessServer -- - - >HA-Mailbox-01 EXMB-01 DAG-01 EXCAS-01.italy.local >HA-Mailbox-02 EXMB-01 DAG-01 EXCAS-02.italy.local Joseph, Thanks for testing this, but it only shows that you can have 2 different CAS servers for 2 different databases on one Exchange server. So your setup is testing just one site, in fact just one server. My question is about accessing a DAG -- which spans 2 sites -- from CAS servers on two different sites at the same time. Can that be done? Thanks. Jay --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
RE: DAG and CAS-Array (or CAS server)
>Name Server MasterServerOrAvailabilityGroup RpcClientAccessServer -- - - >HA-Mailbox-01 EXMB-01 DAG-01 EXCAS-01.italy.local >HA-Mailbox-02 EXMB-01 DAG-01 EXCAS-02.italy.local Joseph, Thanks for testing this, but it only shows that you can have 2 different CAS servers for 2 different databases on one Exchange server. So your setup is testing just one site, in fact just one server. My question is about accessing a DAG -- which spans 2 sites -- from CAS servers on two different sites at the same time. Can that be done? Thanks. Jay --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
RE: DAG and CAS-Array (or CAS server)
>It is well known that you need 2 DAG and minimum 4 Exchange servers in 2 sites
>if you want both sites active.
>This implies that one DAG can be accessed by a CAS only at one site at a time.
Does this clear it up (Just pulled from a mock recovery env)?
[PS] C:\>Get-DatabaseAvailabilityGroup
Name Member Servers
Operational Servers
--
---
DAG-01 {EXMB-02, EXMB-03, EXMB-01}
[PS] C:\>Get-MailboxDatabase |select
Name,Server,MasterServerOrAvailabilityGroup,RpcClientAccessServer
Name Server
MasterServerOrAvailabilityGroup RpcClientAccessServer
--
- -
HA-Mailbox-01 EXMB-01 DAG-01
casArray.italy.local
HA-Mailbox-02 EXMB-01 DAG-01
casArray.italy.local
[PS] C:\>Set-MailboxDatabase -Identity HA-Mailbox-01 -RpcClientAccessServer
EXCAS-01
[PS] C:\>Set-MailboxDatabase -Identity HA-Mailbox-02 -RpcClientAccessServer
EXCAS-02
[PS] C:\>Get-MailboxDatabase |select
Name,Server,MasterServerOrAvailabilityGroup,RpcClientAccessServer
Name Server
MasterServerOrAvailabilityGroup RpcClientAccessServer
--
- -
HA-Mailbox-01 EXMB-01 DAG-01
EXCAS-01.italy.local
HA-Mailbox-02 EXMB-01 DAG-01
EXCAS-02.italy.local
---
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RE: DAG and CAS-Array (or CAS server)
As far as I know, the RpcClientAccessServer setting is mailboxdb specific unbounded by the DAG. My 2 cents though are such that if your db is redundant and you have a single point of failure in a CAS server, thats somewhat counter intuitive to HA. If your DB points to a CAS server in another site, don't you think there very well could be a penalty in bandwidth or latency? Given the CAS Array restriction of one per site, your options shorten but I don't see them as being hindered, jlc From: Jay Kulsh [jayku...@csi.com] Sent: Wednesday, March 07, 2012 5:33 PM To: MS-Exchange Admin Issues Subject: DAG and CAS-Array (or CAS server) For a DAG, can there be separate CAS servers per database, or per site? In the various examples of DAG that I have seen, I find only one CAS (server or server-array) per DAG at a time. If this is in fact the limitation of a DAG, why does one article of Technet would mention that you can split ACTIVE databases between the two sites? Would not it be better to keep all active databases in the site where CAS is? Thanks. Jay Kulsh So. Pasadena, CA --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
RE: DAG and CAS-Array (or CAS server)
Maybe I've just had a long day, but I don't understand your question. -Original Message- From: Jay Kulsh [mailto:jayku...@csi.com] Sent: Wednesday, March 07, 2012 7:33 PM To: MS-Exchange Admin Issues Subject: DAG and CAS-Array (or CAS server) For a DAG, can there be separate CAS servers per database, or per site? In the various examples of DAG that I have seen, I find only one CAS (server or server-array) per DAG at a time. If this is in fact the limitation of a DAG, why does one article of Technet would mention that you can split ACTIVE databases between the two sites? Would not it be better to keep all active databases in the site where CAS is? Thanks. Jay Kulsh So. Pasadena, CA --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe exchangelist
