IBM 57D7 Manuale utente

IBM Power Systems 57D7/57B4 Adapter Write Cache

Version 1.3 dated May 19, 2016

IBM Power Systems 57D7/57B4 Adapter Write Cache

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IBM Power Systems 57D7/57B4 Adapter Write Cache

Version 1.3 dated May 19, 2016

Contents

1 Feature Description 3

2 Software and Hardware Requirements 4

2.0.1 Supported Systems ...................................... 4

2.0.2 Supported Storage Adapter Backplanes .......................... 4

2.0.3 Supported Linux Operating System Releases & Conﬁgurations ............. 4

2.0.4 Minimum SAS RAID Adapter Firmware Level ...................... 5

2.0.5 Minimum Linux iprutils Package Level ........................... 5

3 Installation Instructions 6

3.1 Linux Software Installation Instructions .............................. 6

3.1.1 YUM Repository ....................................... 6

3.1.1.1 Red Hat ...................................... 6

3.1.1.2 SUSE ........................................ 6

3.1.2 Manual Installation ..................................... 7

3.2 Adapter Firmware Installation Instructions ............................ 8

4 Feature Enablement 12

4.1 Curses Interface ............................................ 12

4.2 Command Line Interface ....................................... 14

5 Support 15

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IBM Power Systems 57D7/57B4 Adapter Write Cache

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Chapter 1

Feature Description

This document describes how to enable and use the new volatile adapter write cache feature for the integrated

SAS controllers in the #EL3T and #EL3V SAS backplanes on IBM Power 8247-21L and 8247-22L systems,

the integrated SAS controllers in the #EJ0N and #EJ0S SAS backplanes on the IBM Power 8247-42L,

and the PCIe3 x8 SAS RAID adapter low proﬁle Quad Port 6Gb (#EJ0J and #EJ0M). Once the required

adapter ﬁrmware and Linux software prerequisites are installed, this feature is enabled by default, but can

be manually disabled on a per RAID array basis. This feature enables a volatile write cache in the SAS

RAID adapter into which data is written. This data is then later ﬂushed to the underlying disks. This

allows the RAID adapter to combine multiple host writes into fewer writes to the disks. It also enables the

RAID adapter to issue stripe writes to RAID 5 or 6 arrays, when a full parity stripe of data is available in

the cache, which can eliminate read-xor write overhead that may occur when a write cache is not available.

This can provide a noticeable performance advantage for some write workloads.

The adapter ﬁrmware which implements this volatile write caching feature includes support for a SYNCHRONIZE

CACHE mechanism. This allows journaled ﬁlesystems in the Linux operating system to ﬂush any previously

written data prior to updating the ﬁlesystem journal. This ensures the ﬁlesystem data stays coherent with

respect to the journal in the case of an unexpected power loss of the system. For use cases which access

the RAID array block devices directly and bypass any ﬁlesystems in Linux, it may be desireable to dis-

able this feature, particularly if the software has not been written to issue SYNCHRONIZE CACHE commands.

Instructions on how to disable this feature are described later in this document.

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IBM Power Systems 57D7/57B4 Adapter Write Cache

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Chapter 2

Software and Hardware Requirements

The required hardware, ﬁrmware, and software levels for this feature are described below.

2.0.1 Supported Systems

•IBM Power 8247-21L

•IBM Power 8247-22L

•IBM Power 8247-42L

2.0.2 Supported Storage Adapter Backplanes

•#EL3T: PCIe3 x8 SAS RAID internal adapter 6Gb

•#EL3V: PCIe3 x8 SAS RAID internal adapter 6Gb (Split Backplane)

•#EJ0N: PCIe3 x8 SAS RAID internal adapter 6Gb (4U)

•#EJ0S: PCIe3 x8 SAS RAID internal adapter 6Gb (4U) (Split Backplane)

•#EJ0J: PCIe3 x8 SAS RAID adapter Quad Port 6Gb1

•#EJ0M: PCIe3 x8 SAS RAID adapter low proﬁle Quad Port 6Gb1

2.0.3 Supported Linux Operating System Releases & Conﬁgurations

•Bare Metal Systems (indicated by #EC16):

–Ubuntu Server 16.04, or later

•PowerKVM 3.1 Systems (indicated by #EC40) or PowerKVM 2.1 (#EC20)

–Not supported

•Other environments, such as PowerVM (not PowerKVM, not Bare Metal)

–Red Hat Enterprise Linux 6.5, or later

–Red Hat Enterprise Linux 7.2, little endian, or later

–Red Hat Enterprise Linux 7.2, big endian, or later

1Single adapter conﬁgurations only, feature not supported for dual adapter, HA conﬁgurations

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–SUSE Linux Enterprise Server 11, Service Pack 4, or later

–SUSE Linux Enterprise Server 12, Service Pack 1, or later

–Ubuntu Server 16.04, or later

2.0.4 Minimum SAS RAID Adapter Firmware Level

•14511900

2.0.5 Minimum Linux iprutils Package Level

•2.4.11

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Chapter 3

Installation Instructions

3.1 Linux Software Installation Instructions

3.1.1 YUM Repository

Installing via the IBM Power Tools YUM repository is the preferred method for obtaining the required

2.4.11 version of the iprutils package. Use this method if your system has connectivity to the external

network and is able to download ﬁles direct from the internet. If you are using Ubuntu 16.04, the requisite

version of iprutils should be able to be installed using apt-get, like any other package that is part of the

Ubuntu distribution. In this case, you can skip ahead to section 3.2 on updating the adapter ﬁrmware.

First, conﬁgure the IBM Power Tools YUM repository. Go to the following page for instructions on how to

download the conﬁguration RPM ﬁle and how to conﬁgure the repository: http://www14.software.ibm.

com/webapp/set2/sas/f/lopdiags/yum.html.

Once the repository is conﬁgured, upgrade the iprutils package to the 2.4.11 version from the newly

conﬁgured repository. During this process, you will be prompted to accept the GPG key for the newly added

YUM repository. Please allow this new GPG key to be accepted, otherwise the package installation will be

aborted.

3.1.1.1 Red Hat

# yum update iprutils

3.1.1.2 SUSE

# zypper update iprutils

The currently installed version of iprutils can be veriﬁed with the following command.

# iprconfig --version

iprconfig: 2.4.11.1

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Ensure the iprutils daemons are enabled to start on the next boot. Please note, that the iprinit daemon

must be enabled and running for this write cache feature to get enabled at boot time.

# chkconfig iprinit on

# chkconfig iprupdate on

# chkconfig iprdump on

3.1.2 Manual Installation

Use this method if either the YUM repository method fails or your system is unable to download ﬁles directly

from the internet. Download the iprutils package directly from one of the following locations, depending

on your OS level, and transfer to the server.

RHEL 6.5, or later

http://public.dhe.ibm.com/software/server/POWER/Linux/yum/OSS/RHEL/6/ppc64/iprutils-2.4.11-1.

41.1.ppc64.rpm

RHEL 7.2 Little Endian

http://public.dhe.ibm.com/software/server/POWER/Linux/yum/OSS/RHEL/7/ppc64le/iprutils-2.4.

11-1.1.ppc64le.rpm

RHEL 7.2 Big Endian

http://public.dhe.ibm.com/software/server/POWER/Linux/yum/OSS/RHEL/7/ppc64/iprutils-2.4.11-1.

41.1.ppc64.rpm

SLES 11 SP4

http://public.dhe.ibm.com/software/server/POWER/Linux/yum/OSS/SLES/11/ppc64/iprutils-2.4.11-1.

41.1.ppc64.rpm

SLES 12 SP1

http://public.dhe.ibm.com/software/server/POWER/Linux/yum/OSS/SLES/12/ppc64le/iprutils-2.4.

11-1.41.1.ppc64le.rpm

Next, remove the old iprutils package and then install the 2.4.11 version by running the following com-

mands on the server to which you transferred the iprutils rpm package.

# rpm -e iprutils

# rpm -ivh iprutils-2.4.11-1.41.1.ppc64.rpm

The currently installed version of iprutils can be veriﬁed with the following command.

# iprconfig --version

iprconfig: 2.4.11.1

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Ensure the iprutils daemons are enabled to start on the next boot. Please note, that the iprinit daemon

must be enabled and running for this write cache feature to get enabled at boot time.

# chkconfig iprinit on

# chkconfig iprupdate on

# chkconfig iprdump on

3.2 Adapter Firmware Installation Instructions

The required 14511900 version of SAS adapter ﬁrmware to enable this feature can be downloaded from IBM

Fix Central at the following URL: http://www.ibm.com/support/fixcentral/main/quickorder?parent=

Power%2BIO%2BFirmware&product=ibm/io/featurecode/EJ0T&release=all&platform=all&function=all&source=

fc. The pci.1014034A.51-14511900-1.Linux.noarch.rpm ﬁle should be downloaded. Once downloaded,

install to your Linux system with the rpm command.

# rpm -ivh pci.1014034A.51-14511900-1.Linux.noarch.rpm

To begin the process of installing the new adapter ﬁrmware, ﬁrst login as root on the target server, then

run iprconfig.

You should see a screen similar to this:

IBM Power RAID Configuration Utility

Select one of the following:

1. Display hardware status

2. Work with disk arrays

3. Work with disk unit recovery

4. Work with configuration options

5. Work with microcode updates

6. Devices Statistics

7. Analyze log

Selection:

e=Exit

Select option 5. Work with microcode updates, and press Enter.

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Select option 2. Download latest microcode to all devices, and press Enter.

Work with microcode updates

Select one of the following:

1. Download microcode

2. Download latest microcode to all devices

Selection:

e=Exit q=Cancel

You should then see a screen similar to the following screen, showing one or more adapters to be updated

with the pci.1014034A.51.14511900 ﬁrmware image.

Confirm Microcode Download

The following devices are going to be updated.

ATTENTION: System performance may be

affected during the microcode download process. Download may take some time.

Press Enter to continue.

q=Cancel to return and change your choice.

Name Version Date Image File

------ --------- --------- -----------------------------

sg6 14511900 05/12/16 /lib/firmware/pci.1014034A.51.14511900

sg7 14511900 05/12/16 /lib/firmware/pci.1014034A.51.14511900

q=Cancel

Press Enter and follow the prompts. Once the operation is completed, return to the main menu by pressing

’e’ if necessary.

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IBM Power Systems 57D7/57B4 Adapter Write Cache

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The current version of the adapter ﬁrmware can be conﬁrmed by selecting option 1. Display hardware

status. This should present a screen similar to this:

Display Hardware Status

Type option, press Enter.

1=Display hardware resource information details

OPT Name PCI/SCSI Location Description Status

--- ------ ------------------------- ---------------------------- ------------

0003:70:00.0/0: PCI-E SAS RAID Adapter Operational

sda 0003:70:00.0/0:2:0:0 RAID 0 Array Optimized

0003:70:00.0/0:0:0:0 RAID 0 Array Member Active

sdb 0003:70:00.0/0:2:1:0 RAID 10 Array Optimized

0003:70:00.0/0:0:1:0 RAID 10 Array Member Active

0003:70:00.0/0:0:2:0 RAID 10 Array Member Active

sdc 0003:70:00.0/0:2:2:0 RAID 5 Array Optimized

0003:70:00.0/0:0:3:0 RAID 5 Array Member Active

0003:70:00.0/0:0:4:0 RAID 5 Array Member Active

0003:70:00.0/0:0:5:0 RAID 5 Array Member Active

More...

e=Exit q=Cancel r=Refresh t=Toggle f=PageDn b=PageUp

Using the arrow keys, place the cursor next to the PCI-E SAS RAID Adapter, type 1, and press Enter.

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