Dell PowerStore 1200T Using the Common Event Enabler 8.x on Windows Platforms - Page 58

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Table 11. CEE known problems and workarounds (continued) Known problem Symptom Workaround If you have configured more than one server, and if one of the AV machines fails, file scanning is redirected to other available AV machines. If none of the AV machines are available, the VNX Data Mover or Unity NAS server CIFS service proceeds without any virus-checking capabilities. This enables the VC client to reconnect to the failed AV machine when it is operational. NOTE: All AV engines are polled every 60 seconds (by default) to determine which AV engines are online and available. shutdown action to take when an AV machine is not available. CAVA can be configured to prevent all CIFS client access to any VNX or Unity share when AV machines are unavailable. The shutdown= parameter in Parameters in the viruschecker.conf file provides details. Using Microsoft SMB2 When using Microsoft SMB2 as the protocol between AV engines and VNX or Unity, the Microsoft Redirector uses a local cache for directory metadata on the machine where the AV engine resides. By default, this cache is invalidated every 10 seconds. As a consequence, the updates that are made to the server share during this period cannot be seen in the cache. It is possible under these conditions that AV engines will not scan the files requested by CAVA, as the Redirector intercepts the scan and returns a file not found error. This failure to scan occurs because the contents of the Redirector's cache and the actual directory structure on the server share do not match. The Data Mover's or NAS server's server_log contains the following SMB2 error message: file not found To avoid this condition, you must disable the directory cache on the machines on which CAVA and AV engines are running by using the following procedure: 1. Open the Windows Registry Editor and navigate to HKLM\System\CurrentControlSet\Se rvices\LanmanWorkstation\Paramet ers. 2. Right-click Parameters and select New > DWORD Value. 3. For the new REG_DWORD entry, type a name of DirectoryCacheLifetime. 4. Set the value to 0 to disable DirectoryCacheLifetime. 5. Click OK. 6. Restart the machine. Event publishing agent cannot communicate with the EMC CAVA service. OFFLINE is displayed when running a CEPA command. Open Windows Services and verify that the EMC CAVA service is started and running. Training and Professional Services Customer Education courses help you learn how the storage products you purchased work together within your environment to maximize your entire infrastructure investment. Customer Education features online and hands-on training in state-of-the-art labs conveniently located throughout the world. Customer training courses are developed and delivered by experts. Go to Online Support at https://www.dell.com/support for course and registration information. Professional Services can help you implement your system efficiently. Consultants evaluate your business, IT processes, and technology, and recommend ways that you can leverage your information for the most benefit. From business plan to implementation, you get the experience and expertise that you need without straining your IT staff or hiring and training new personnel. Contact your Customer Support Representative for more information. 58 Troubleshooting

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Table 11. CEE known problems and workarounds (continued)
Known problem
Symptom
Workaround
If you have configured more than one
server, and if one of the AV machines
fails, file scanning is redirected to other
available AV machines. If none of the
AV machines are available, the VNX Data
Mover or Unity NAS server CIFS service
proceeds without any virus-checking
capabilities.
This enables the VC client to
reconnect to the failed AV
machine when it is operational.
NOTE:
All AV engines are
polled every 60 seconds (by
default) to determine which
AV engines are online and
available.
shutdown action to take when an AV machine
is not available.
CAVA can be configured to prevent all CIFS
client access to any VNX or Unity share when
AV machines are unavailable.
The
shutdown=
parameter in
Parameters in the
viruschecker.conf file
provides details.
Using Microsoft SMB2
When using Microsoft SMB2 as the
protocol between AV engines and VNX
or Unity, the Microsoft Redirector uses a
local cache for directory metadata on the
machine where the AV engine resides. By
default, this cache is invalidated every 10
seconds. As a consequence, the updates
that are made to the server share during
this period cannot be seen in the cache.
It is possible under these conditions
that AV engines will not scan the files
requested by CAVA, as the Redirector
intercepts the scan and returns a file not
found error. This failure to scan occurs
because the contents of the Redirector’s
cache and the actual directory structure
on the server share do not match.
The Data Mover's or NAS
server's
server_log
contains
the following SMB2 error
message:
file not found
To avoid this condition, you must disable the
directory cache on the machines on which
CAVA and AV engines are running by using the
following procedure:
1.
Open the Windows
Registry Editor
and
navigate to
HKLM\System\CurrentControlSet\Se
rvices\LanmanWorkstation\Paramet
ers
.
2.
Right-click
Parameters
and select
New >
DWORD Value
.
3.
For the new
REG_DWORD
entry, type a
name of
DirectoryCacheLifetime
.
4.
Set the value to
0
to disable
DirectoryCacheLifetime
.
5.
Click
OK
.
6.
Restart the machine.
Event publishing agent cannot
communicate with the EMC CAVA
service.
OFFLINE
is displayed when
running a CEPA command.
Open Windows Services and verify that the
EMC CAVA service is started and running.
Training and Professional Services
Customer Education courses help you learn how the storage products you purchased work together within your environment
to maximize your entire infrastructure investment. Customer Education features online and hands-on training in state-of-the-art
labs conveniently located throughout the world. Customer training courses are developed and delivered by experts. Go to Online
Support at
for course and registration information.
Professional Services can help you implement your system efficiently. Consultants evaluate your business, IT processes,
and technology, and recommend ways that you can leverage your information for the most benefit. From business plan to
implementation, you get the experience and expertise that you need without straining your IT staff or hiring and training new
personnel. Contact your Customer Support Representative for more information.
58
Troubleshooting