Red Hat APPLICATION STACK 1.2 RELEASE Guia de Instalação descarregar pdf (Página 10)

Release Notes

Optionally increase the max number of processID values

The kernel defaults to using a maximum of 32,768 processID values. Scyld ClusterWare automatically increases this default

to 98,304 [= 3*32768], which likely is adequate for small- to medium-size clusters and which keeps pid values at a familiar

5-column width maximum. Because BProc manages a common process space across the cluster, even the increase to 98,304

may be insufﬁcient for very large clusters and/or workloads that create large numbers of concurrent processes. The cluster

administrator can increase the value further by using the sysctl command, e.g.,

/sbin/sysctl -w kernel.pid_max=N

directs the kernel to use pid values up to N. The kernel (and BProc) supports an upperbound of 4,194,304 [= (4*1024*1024)].

To set a value N that persists across master node reboots, add an entry

kernel.pid_max=N

to /etc/sysctl.conf.

Optionally increase the max number of open ﬁles

The kernel defaults to a maximum of 1024 concurrently open ﬁles. This value may be too low for large clusters. The cluster

administrator can add a noﬁle override entry to /etc/security/limits.conf to specify a larger value. Caution: for

noﬁle, use only a numeric upperbound value, never unlimited, as that will result in being unable to login.

Issues with Ganglia

The Ganglia cluster monitoring tool may fail for large clusters. If the /var/log/httpd/error_log shows a fatal error of

the form PHP Fatal error: Allowed memory size of 8388608 bytes exhausted, then edit the ﬁle /etc/php.ini to increase

the memory_limit parameter. The default is memory_limit = 8M can be safely doubled and re-doubled until the error goes

away.

Post-Installation Release of Updated Packages

From time to time, Penguin Computing may release updated Scyld ClusterWare 4.9 rpms to track Red Hat kernel security or

bug ﬁx errata or to ﬁx critical Scyld ClusterWare problems. You can check for the availability of updated Scyld ClusterWare

rpms by doing:

yum list updates --disablerepo=* --enablerepo=cw*

If updates are available, you should ﬁrst download the latest version of the Scyld ClusterWare 4 Release Notes from the

Penguin Computing Support Portal (http://www.penguincomputing.com/ﬁles/scyld-docs/CW4/ReleaseNotes.pdf) to ensure

you have the latest guidance before updating your cluster. In general, if you choose to update Scyld ClusterWare packages,

then you should update all available packages.

If your cluster uses Panasas storage, then before updating Scyld ClusterWare you must ensure that a Panasas kernel module

is available that matches the Scyld ClusterWare kernel that will be installed. See the section called Important for clusters

using Panasas storage in the About This Release introduction for more information.

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Apc SURT20KRMXLT Specifikace (31 strany)

Značka: Apc | Kategorie: Uninterruptible power supplies (UPSs) | Velikost: 1.05 MB |

Tabulka s obsahem

Smart-UPS

Introduction

Accessories

Specifications

Front and rear UPS panels

Stack configuration

Rack-mount configuration

Communication ports

Route network cable

Emergency Power Off (EPO)

Wiring Specifications

Input wiring

Input hardwiring

Output wiring

Hardwire the load

Start-Up

Operation

Display interface

Navigating menu screens

Navigating sub menu screens

Menu Tree

Configuration

Menu screens map

External Battery Pack

Threshold

General

Maintenance and service

Two-Year Warranty

Contact information

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