OCFS2

                                         Toores. Ehk seda pala võib täiendada.

Sissejuhatus

OCFS2 is the next generation of the Oracle Cluster File System for Linux. It allows you to mount volumes on different hosts at the same time. It is an extent based, POSIX compliant file system. OCFS2 is a general-purpose file system that can be used for shared Oracle home installations making management of Oracle Real Application Cluster (RAC) installations even easier. Among the new features and benefits are:

Node and architecture local files using Context Dependent Symbolic Links (CDSL) Network based pluggable DLM Improved journaling / node recovery using the Linux Kernel "JBD" subsystem Improved performance of meta-data operations (space allocation, locking, etc). Improved data caching / locking (for files such as oracle binaries, libraries, etc)

inotify ja dnotify sünkroniseerimine masinate kernelite vahel?

dlm distributed lock manager - lukustamine üle võrgu.

OCFS2 also provides the following capabilities:

• Metadata caching.
• Metadata journaling.
• Cross-node file data consistency.
• Support for multiple-block sizes up to 4 KB, cluster sizes up to 1 MB, for a maximum volume size of 4 *PB (Petabyte).
• Support for up to 32 cluster nodes.
• Asynchronous and direct I/O support for database files for improved database performance.

Redhat

Installimine on lihtne, eriti RedHatiga ;)

Vaadake, millise kerneli jaoks ka tõmbate ;)

wget http://oss.oracle.com/projects/ocfs2/dist/files/RedHat/RHEL4/x86_64/1.2.5-1/2.6.9-42.EL/ocfs2-2.6.9-42.ELsmp-1.2.5-1.x86_64.rpm

wget http://oss.oracle.com/projects/ocfs2-tools/dist/files/RedHat/RHEL4/x86_64/1.2.4-1/ocfs2-tools-1.2.4-1.x86_64.rpm

wget http://oss.oracle.com/projects/ocfs2-tools/dist/files/RedHat/RHEL4/x86_64/1.2.4-1/ocfs2console-1.2.4-1.x86_64.rpm

rpm -i ocfs2*

Kes tahab sortsust kokku lasta, siis selleks ka võimalus
http://oss.oracle.com/projects/ocfs2/files/source/

Et kõik moodulid masina buutimisel üles laetakse, tuleb käivitada

/etc/init.d/o2cb configure
/etc/init.d/o2cb load
chkconfig ocfs2 on
chkconfig o2cb on

Oracle on valmis teinud ka kena GUI "ocfs2console", võimalusel kasutage seda

Kõigepealt teeme klastri, lisame masinad

confifailid asuvad /etc/ocfs2/cluster.conf ja /etc/sysconfig/o2cb

Gentoo

Kernel

<*> GFS2 file system support

File systems --->   
   [*] OCFS2 file system support
   [*]   O2CB Kernelspace Clustering
   [*]   OCFS2 statistics
   [*]   OCFS2 logging support
   [ ]   OCFS2 expensive checks

Paigaldamine

echo "sys-fs/ocfs2-tools ~amd64" >> /etc/portage/package.keywords
emerge -av sys-fs/ocfs2-tools

Fstabi vaja lisada read

none         /sys/kernel/config         configfs        defaults                0 0
none         /sys/kernel/dlm            ocfs2_dlmfs     defaults                0 0

Konfigureerimine

cat /etc/ocfs2/cluster.conf 

node:
        ip_port = 7777
        ip_address = 192.168.0.31
        number = 0
        name = test1
        cluster = server

node:
        ip_port = 7777
        ip_address = 192.168.0.32
        number = 1
        name = test2
        cluster = server

cluster:
        node_count = 2
        name = server

Gentoo puhul tuleb kirjutada faili /etc/conf.d/ocfs2 ka clustri nimi mida starditakse, meiepuhul

OCFS2_CLUSTER="server"

Vaikimisi on clustri nimi OCFS2_CLUSTER="home"

ocfs2 failisüsteemi tegemiseks füüsilisele kettale on käsk mkfs.ocfs2

# mkfs.ocfs2 -N 2 -L ocfs2_test /dev/sda

seejuures N 2 võti näitab mitu masinat osaleb clustri töös. Veel võimalikud võtmed on:

• -b : Block size (values are 512, 1K, 2K and 4K bytes per block)
• -C : Cluster size (values are 4K, 8K, 16K, 32K, 64K, 128K, 256K, 512K and 1M)
• -L : Label

et mountida ketast võib kasutada GUI'd või mount -t ocfs2 /dev/xxx /xxx või kõik ocfs2 kettad mount -at ocfs2

# mount /dev/sda /srv/

Ja teises nodes ka teenus startida ja mountida

/etc/init.d/ocfs2 start

Ocfs boodil startima

# rc-update add ocfs2 default

http://kuutorvaja.eenet.ee/wiki/OCFS2_failis%C3%BCsteemi_kasutamine_Debianiga

Täpsem õpetus http://oss.oracle.com/projects/ocfs2/dist/documentation/02-mount_umount.pdf

Imre Manuali järgi klustri mõõduka kasutamise korras toimub üle 7777/tcp pordi märkimisväärne andmevahetus, ca 500 kBait/s.