ACE: Server- /backup-server connection failover

Hi, I have a question regarding server-failover when using rserver+backup-rserver or serverfarm+backup-serverfarm (via sticky).
My understanding is, that in case a server fails, the existing connections will not fail over to a backup-server.
We are looking for a way to change that (default) behaviour - We've already searched the documentation etc. and found the "failaction reassign/purge". But when my colleague tried to have this confirmed via TAC, it got pretty confusing and we were told, there's no way to do/solve this..
So in a second attempt, does anyone have experience with this - maybe can confirm or give another solution?
Thanks & Regards,
Max

This was answered sometime back in few discussion:
first, not all servers accept TCP connection to be reassigned to them.
This is because tcp requires 3-way handshake and keeps track of sequence/ack numbers.Therefore, the servers need some way to exchange this information or to start in the middle.
On ace, we have 2 commands "failaction reassign" or "failaction purge".
The reassign is to simply move the connection to a backup server.
The purge is to kill the connection forcing the client to reopen a new one - this new connection will then be loadbalance to an active server.

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ACE Backup-server failover

I'm having trouble with the functionality of backup servers in a serverfarm.
Lets say I have three rservers in a serverfarm. Each rserver has a backup-server assigned to it. When a probe detects that one of the three nodes failed, the ACE puts the backupserver in rotation for the whole serverfarm. This causes one out of three connections to show a "under construction" page. However two of the three nodes are still functioning, but users randomly see a construction page, which confuses them.
Is there a way to configure the ACE to follow this procedure?
One server fails a probe, take server out of rotation
Second server fails a probe, take server out of rotation
Third server fails a probe, take server out of rotation
Place backupserver in rotation for the whole farm
When one server comes back online, put it inservice and take backupserver out of rotation.
The intent is for the rservers to be self-sufficient making server administrators not have to have any knowledge of ACE and need to login and manually place a serever out of service. I want a probe to detect IIS failing and allow server administrators to work on one node at a time without an outage, and still retain a construction page if all nodes fail.

Hi,
Probably, you may need a "sorry server" configuration but also there´s another way which you may take into account which backup serverfarm, please take a look:
http://www.cisco.com/en/US/docs/interfaces_modules/services_modules/ace/vA5_1_0/configuration/slb/guide/classlb.html
backup
name2
—(Optional) Designates an existing host (with valid content) or a redirect (sorry) server farm as a backup server farm in case all the real servers in the primary server farm become unavailable. You can configure one backup server farm for each existing primary server farm. When at least one server in the primary server farm becomes available again, the ACE sends all new connections back to the primary server farm. The ACE allows existing connections to the backup server farm to complete."
Regards,
Jorge

Backup server on an ACE

When creating a backup server on an ACE running A5(2.1), we're using the probe as the trigger. Once the primary real server has failed to the backup, will it fail back to the primary server when the probe deems the primary server available?
It's just as well as the ACE manual documents the backup serverfarm, there's dearth of info on the backup server.
Thanks.
_ Greg

Hi Greg,
Backup rserver as you know would be configured with standby keyword. When primary server will be Operational (probe passed)
- Existing connections on backup keep accessing backup.
- For new connection requests ACE looks up sticky entries, if there's already an entry for backup server, the connection is sent to the standby rserver.
- If a new client request (connection) doesn't match any sticky entry for backup rserver ACE forwards this request to primary.
Let me know if you have any questions.
Regards,
Kanwal
Note: Please mark answers if they are helpful.

ACE backup-server and sticky

Hi all,
a question:
     if a configure a serverfarm with backup-server
serverfarm host S_Das
rserver DAS1
    backup-rserver DAS1_1
    inservice
rserver DAS_1
    inservice standby
rserver DAS2
    backup-rserver DAS2_1
    inservice
rserver DAS_1
    inservice standby
sticky ip-netmask 255.255.255.255 address both SF_DAS
timeout 10
replicate sticky
serverfarm S_Das
and rserver DAS1 goes down what will be behaviour of sticky and balancing?
New connection wel'll go towards DAS2 or a tricky and clever sticky take precedence? (i mean persistence on DAS1_1 that is my backup server..)
tnx
Das

Hi Danilo,
If your primary rserver goes down the sticky entries associated with that server will be automatically flushed from the sticky table so that
all new incoming connections will be diverted to your backup rserver.
In case that primary rserver comes back then:
- Existing connections on backup keep accessing backup.
- For new connection requests ACE looks up sticky entries, if there's already an entry for backup server the connections is sent to the standby rserver.
- If a new client request (connection) doesn't match any sticky entry for backup rserver ACE forwards this request to primary.
In case that you want to use the primary rserver for all the connections after coming back to operational state then the backup option would be configured like this:
rserver Primary
ip address 10.10.10.2
inservice
rserver Standby
ip address 10.10.10.3
inservice
serverfarm host Primary
rserver Primary
    inservice
serverfarm host Standby
rserver Standby
    inservice
policy-map type loadbalance http first-match slb
class class-default
serverfarm Primary backup Standby
HTH

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Robert Pearman SBS MVP
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The host is not authorized to connect to this Backup Server

Hi experts,
I'm trying to connect to a remote backup server S2_BS running on VM2 from a data server S1 running on VM1. When I issued following command in isql
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Msg 7221, Level 14, State 2:
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(Screenshot attached)
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regards,
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Hi Greg,
Backup rserver as you know would be configured with standby keyword. When primary server will be Operational (probe passed)
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Note: Please mark answers if they are helpful.

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http://discussions.apple.com/thread.jspa?messageID=10381710#10381710
Leopard requirements/10.5.x...
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Hello guys,
I have 1 backup & symantec mangement server in 2 different sites with 4 nics each (2 for management & 2 for backup traffic diferent Vlan
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Any help would be appreciated.
ndraj

Hi,
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As what I understood, the server connect to both 192.168.1.x and 192.168.2.x, then subnet 192.168.2.x should be reachable even if you do nothing on routing table.
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Hope this helps.

ACE: Server- /backup-server connection failover

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