系统上升级bios，环境：dell 服务器

DSU升级，又称DELL EMC System Update,支持Linux和windows操作系统，主要可用于一下方面：

1.BIOS和fireware升级

2.OpenManager 软件

This release of DELL EMC System Update (DSU) supports the following new features and operating systems:

• Creating a Bootable ISO using script
• Option to display Criticality of the Updates
• Network capability for DSU on RedHat and SUSE based Operating Systems
• New BIOS and Firmware updates

Known Issues:

• In Platforms with OS Collector (version OSC_1.1) installed, DSU Comparison report will show as Downgrade to OS Collector 2.0
  Advice: Apply the OS Collector 2.0 update through DSU, though DSU shows it as Downgrade.

这是dell官网的原话，支持系统级别的BIOS升级，优势是系统级别升级，不用现场在服务器前倒腾，但劣势是升级后如果有问题那必须去现场。下面贴一段dell官网的话。

Supported Operating Systems

Linux (RHEL and SUSE)

• Red Hat Enterprise Linux 6.9 (x86_64)
• Red Hat Enterprise Linux 7.3 (x86_64)
• SUSE Linux Enterprise Server 11SP4 (x86_64)
• SUSE Linux Enterprise Server 12SP2 (x86_64)

Microsoft Windows

• Microsoft Windows Server 2008 R2 (x86_64)
• Microsoft Windows Server 2012(x86_64)
• Microsoft Windows Server 2012 R2 (x86_64)
• Microsoft Windows Server 2016 (x86_64)

Support for Ubuntu operating systems

Updating Firmware

The below command will provide a command line interface to update firmware

#dsu

DSU utility version

dsu --version

Displaying the DSU utility version.

Getting System Inventory

#dsu --inventory

    To see the System Inventory

Category based installation

DSU allows category based device updates

Listing supported categories

#dsu --get-categories

    Gets the supported category values

Getting specific category updates

#dsu --category=<CATEGORY1,CATEGORY2,...>

    List only those updates belonging to categories

Non-interactive device updates

#dsu --non-interactive

    DSU supports devices updates in a non-interactive way where all the updatable components will be selected automatically and apply those updates without user intervention.

Getting the Upgradable updates only

dsu --apply-upgrades-only

    To get the list of only upgradable components

Getting the Downgradable updates only

dsu --apply-downgrades-only

    To get the list of only downgradable components

Getting the Equivalent updates

dsu --apply-equivalent-updates

    To get the list including equivalent components

Applying the updates specified in the file list

dsu --update-list=<FILENAME1,FILENAME2,...>

    To apply the updates specified in the file list, if available in configured repository.

Configuration file for DSU

dsu --config=<FILE>

    To provide the path of the configuration file for DSU.

Configure the type of repository

dsu --source-type=<TYPE>

    To configure the source type of repository. The supported type is PDK (Partner Distribution Kit).
    PDK is a format for the Dell Online catalog, such as catalog.xml or catalog.gz

Configure the path of repository

dsu --source=<PATH>

    To configure the path of repository. When the source type is PDK, location of the repository is mandatory.

Package the updates into a bootable ISO or a directory

dsu --destination-type=<TYPE>

上面贴了一段dsu命令的使用，主要就是dsu命令升级。

下面是升级的具体步骤：

1.首先去dell官网下载emc yum源
wget -q -O - http://linux.dell.com/repo/hardware/dsu/bootstrap.cgi | bash
2.yum安装dell系统更新包
yum install dell-system-update
3.最后是dsu命令升级
dsu -e

贴图一张，命令打完出来的情况，然后根据自己选择。