GENERAL ERROR: In some environments, PureDisk Remote Office Edition 6.5.x can lose connectivity with Dell Equalogic iscsi based /Storage volume arrays due to iscsid disconnects when under load.
| Article:TECH64283 | | | Created: 2008-01-21 | | | Updated: 2009-01-13 | | | Article URL http://www.symantec.com/docs/TECH64283 |
Problem
GENERAL ERROR: In some environments, PureDisk Remote Office Edition 6.5.x can lose connectivity with Dell Equalogic iscsi based /Storage volume arrays due to iscsid disconnects when under load.
Solution
The
issue:
PureDisk
6.5.x loses connectivity to Dell Equalogic iscsi based /Storage volume arrays
due to iscsid disconnects while under load when the array dynamically changes IP
addresses.
Troubleshooting:
Dell
Equalogic iscsi disk arrays contain a feature that dynamically load balances
network traffic by changing IP addresses for iscsi initiator/target traffic.
This will cause problems when the default pdiptables rules (within
/etc/puredisk/iptables-rules) detect a stateless inbound TCP connection from a
new/different Equalogic IP address. Iptables will drop this new, stateless
connection. If the iscsid reconnection takes longer than 1 second, the result is
a loss of iscsid connectivity between PDOS and the array which can cause a
complete loss of access with the array based /Storage volume(s).
When PDOS
loses access to the iscsi based /Storage volume(s), /var/log/messages will
report iscsid connectivity issues:
Jun
11 01:05:02 hostname kernel: iscsi: host reset succeeded
Jun
11 01:06:15 hostname iscsid: connection0:0 is operational after recovery (1
attempts)
Jun
11 01:06:43 hostname kernel: iscsi: host reset succeeded
Jun
11 01:07:13 hostname iscsid: connection0:0 is operational after recovery (1
attempts)
Jun
11 01:07:40 hostname iscsid: connection0:0 is operational after recovery (1
attempts)
Jun
11 01:09:00 hostname kernel: connection0:0: iscsi: detected conn error (1011)
Jun
11 01:09:00 hostname iscsid: detected iSCSI connection 0:0 error (1011) state
(3)
Jun
11 01:09:03 hostname kernel: iscsi: host reset succeeded
Resolution:
Edit file custom_iptables_rules to define the IP address of the additional NIC(s) on the Equalogic iscsi array from source TCP port 3260.
1. Log into each PureDisk node as root.
2. Use a text editor to open the following file: /etc/puredisk/custom_iptables_rules
This file contains a table that you can use to add one or more lines to specify the IP address of the second, and any additional, NIC(s).
For example:
#
protocol (tcp,udp,icmp,all) # source[/mask] # port
tcp 192.168.1.44 3260
tcp 192.168.1.45 3260
3. Save and close the file.
4. Run the following command to repopulate PureDisk's firewall information with the new rule:
4. Run the following command to repopulate PureDisk's firewall information with the new rule:
#
sh /opt/pdconfigure/scripts/installers/ChangeIPTables.sh
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Legacy ID
311995
Article URL http://www.symantec.com/docs/TECH64283
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Thank you.