Digital Equipment ML200-AA User manual

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ML200 PCI NVRAM Installation Information
EK–ML200–IN. A01
October 1994
Introduction
The ML200 PCI NVRAM module is a nonvolatile disk write cache used to
accelerate file servers that use NFS, a synchronous disk I/O protocol. The ML200
module may be installed in any full-size 5 V 32-bit PCI slot. The ML200 is
available in three options: ML200-AA (2 MB), ML200-BA (4 MB), and ML200-CA
(8 MB).
Installation Procedure
Use the following procedure to install the ML200 PCI NVRAM module in an
Alpha AXP system:
1. Before installing the ML200 PCI NVRAM module, contact your service
representative to verify that the installed versions of OSF/1 and console code
support the ML200 module. If they do not support the ML200 module, a
system software upgrade is required before proceeding.
2. Refer to the system documentation to identifya5V32-bit PCI slot location
and module orientation for installing the ML200 PCI NVRAM module.
3. Install the Prestoserve license product authorization key (PAK) by referring to
the DEC OSF Guide to Prestoserve documentation. Follow these instructions
for reconfiguring the system with the Prestoserve driver enabled.
4. Perform an orderly powerdown of the system.
5. Remove the ML200 PCI NVRAM module from the shipping container.
6. Remove the Mylar insulator located between the battery and the + battery
terminal clip (see Figure 1). Do not place the module on a metal or conductive
surface. Doing so could discharge or damage the battery.
7. Remove any system covers, if necessary, to allow access to the PCI slots.
© Digital Equipment Corporation 1994. All Rights Reserved.
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8. Remove the blank filler panel from the slot selected for installing the ML200
PCI NVRAM module. (Save the filler panel screw for securing the ML200
module in place.)
9. Slide the module into the selected slot and apply firm pressure until the
module is firmly seated. Secure the module in place with the screw that was
saved from the filler panel removal.
10. Replace all system covers, then reboot the system and verify that the ML200
PCI NVRAM is recognized by the system.
Figure 1 ML200 PCI NVRAM Module Battery, LEDs, and Test Switch
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MA00118
! Battery holder
" Battery
# + battery terminal clip
$ Mylar insulator
% Battery charged LED
& Battery enabled LED
' Battery enabled test switch
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Status LEDs and Test Switch
The ML200 PCI NVRAM module has two status LEDs and a recessed test switch
(see Figure 1).
Battery Charged LED—The green battery charged LED indicates the charge
status of the battery. When the LED is on, the battery is charged to a sufficient
level (2.5 V minimum). When the LED is off, the battery is not charged to a
sufficient level. If the battery is not sufficiently charged when the system is
booted, this LED will not be on and a 24-hour charging cycle begins. If the
battery charged LED is still not on 24 hours after booting the system, the battery
should be replaced.
Battery Enabled LED—The green battery enabled LED indicates whether the
battery can supply power to the SRAMs and whether there is valid data in the
NVRAM. When the LED is on, the battery will supply power to the SRAMs if the
system power fails and valid data is in the NVRAM. When the LED is off, the
battery will not supply power to the SRAMs if the system power fails and there is
no valid data in the NVRAM.
Battery Enabled Test Switch—The battery enabled test switch is a recessed
momentary contact switch that is used to verify whether the battery is supplying
power to the SRAMs and valid data is in the NVRAM when the module is
removed from the system or the system is powered off.
With the module removed from the system or the system powered off, depress
the battery enabled test switch for 1 to 2 seconds and then release. When the
switch is released, the battery enabled LED will be on momentarily if the battery
is supplying power to the SRAMs and valid data is in the NVRAM. If the battery
enabled LED is not on momentarily when the switch is released, then either
there is no valid data in the NVRAM or the battery is discharged.
Caution
The battery enabled test switch should NEVER be depressed while the
module is installed in a powered-up system.
Battery Removal and Replacement
The ML200 PCI NVRAM module contains a 3 V lithium-magnesium rechargeable
battery that provides battery backup for preserving valid data in the NVRAM
when the system loses power or is turned off. This battery should be replaced
only with the same type battery (PN 12-39864-04) or an equivalent (leadless
SANYO ML2430 [90 ma-hr]) battery.
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Before removing and replacing the battery, read the Battery Information Sheet
(36-43426-01) that is shipped with the module and observe all CAUTIONS about
battery replacement and disposal.
To remove the battery from the module, remove the module bracket, lift the +
battery terminal clip (being careful not to bend it), and slide the battery out of
the battery holder.
To replace the battery, slide the new battery under the + battery terminal clip,
being careful not to bend it. Be sure that the + battery terminal is facing up.
Mylar is a registered trademark of E. I. DuPont de Nemours and Company, Inc.
The DIGITAL logo is a trademark of Digital Equipment Corporation.
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