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Backing up SAN LUN
We have a Model 70-0120 PS4000, we have one LUN connected through our Ethernet NIC on a Dell 2850 for our user and group shares. While backing up the shares, it stops halfway through and my server becomes unavailable and needs a reboot. I am looking through the events and in the PS4000 and see that the target went offline. We are backing up @500GB of data and I'm try to determine if I am overloading the NIC on the server causing the outage
thanks
Pat
Anonymous
5 Practitioner
5 Practitioner
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274.2K Posts
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July 24th, 2011 07:00
Are you backing up a snapshot? or the original volume? If the snapshot runs out of reserve it will be deleted. If you are not backing up a snapshot and the VOLUME is going offline open a case with support. They'll need diags from the array.
What are you using for a switch? Backups are sustained reads, a common issue is that the switch isn't up to iSCSI spec and/or flowcontrol isn't enabled and which causes the connection to get dropped because of retransmit timeout errors.
-doln
evilensky
74 Posts
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July 25th, 2011 14:00
Hello,
When you say the target has gone offline, do you mean its status is "Offline" in CLI/Group Manager GUI?
Or is it an "offline volume" as reported by the machine's Disk Management MMC snap-in?
PD001
17 Posts
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July 26th, 2011 04:00
The Target meaning the Windows 2003 Server the LUN is connected to, Backing up the LUN with a Backup Exec Agent, I looked through the Events and found the following on the server
Event Type: Error
Event Source: EqualLogic
Event Category: VSS
Event ID: 4002
Date: 7/25/2011
Time: 5:19:35 AM
User: N/A
Computer: WIHDFPS01
Description:
Error 0x80070490 opening SNMP connection to \\.\PHYSICALDRIVE2 (0-8a0906-d811f1407-ac2000cfa8b4c2db).
DELL-Joe S
7 Technologist
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729 Posts
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July 26th, 2011 06:00
PD001,
Review the connection configuration starting at the dedicated iSCSI interface on the server, then the iSCSI switch global and port settings. These settings should be optimized for iSCSI. We have several documents on the support site that discusses how to do this. A good starting point is the Configuration Guide (http://dell.to/bE5fBd) and the Group Administration Guide (available on the Firmware Download page – use the guide that matches the version of firmware currently running on the array).
Regarding the iSCSI network:
Ensure you have the latest drivers and firmware on the LAN and iSCSI interfaces hosted by this server (and are properly configured in the advanced settings).
Ensure you have the latest firmware on your switches.
Ensure you have setup a separate VLAN on the switch just for iSCSI traffic.
Ensure the switch is setup properly for iSCSI.
Regarding the array:
Ensure you have the latest FW version installed.
Check the event log for anything unusual (i.e., unable to communicate to host during the backup time).
(Optional) setup a syslog server to capture all the events from the array, this makes monitoring the array easier, then having to use the GUI event log.
As Don suggested, if you have reviewed all of this and feel the SAN network is properly setup, then open a support case.
Regards,
Joe