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Marian Marinov - [email protected] Architect - Siteground.com
HighLoad++ 2008 Moscow
Clusters with GlusterFS
Moscow 06-07.Oct.2008
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Moscow 06-07.Oct.2008
Agenda
Cluster Filesystems
Some facts
Gluster Design
➢ kernel ➢ gluster engine
➢ protocols➢ translators➢ storage➢ performance➢ others
➢ schedulers
Some benchmarks
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Cluster Filesystems
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Facts
GlusterFS project starts in August 2006
It is not actual Filesystem
Server only for LinuxClient running on Linux & FreeBSD
Very scallable
Very easy to install and maintain
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GlusterFS Desgin
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GFarm Desgin
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Gluster Filesystem Design
In the kernel
➢ Requires FUSE➢ FUSE as module➢ GlusterFUSE
The engine
➢ Server & Client➢ Transport Modules➢ Translators➢ Scheduler Modules
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GlusterFS Desgin
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GlusterFS Desgin
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The picture explained:
ClientX:
volume serverX - defines a name for a remote serversubvolumes brick0 - defines in which of all exported volumes from
the remote server we are interested
some performance translators
volume unify - defines that we will use unify cluster translatorsubvolumes serverX serverY - defines which already connected storage volumes will be used
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Gluster Filesystem Design
Transport Modules:For TCP/IP transport
transport-type tcp/serverFor Infiniband SDP transport
transport-type ib-sdp/serverFor Infiniband Verbs transport
transport-type ib-verbs/server
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Gluster Filesystem Design
The idea – GNU/Hurd
Translators
➢ Performance➢ Clustering ➢ Scheduling➢ Storage➢ Others
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Gluster Filesystem Design
Performance translators
➢ Read Ahead➢ Write Behind➢ Threaded I/O➢ IO-Cache➢ Stat Pre-fetch – still not ported to the new versions➢ Booster
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Gluster Filesystem Design
Clustering translators
➢ Stripe➢ Unify➢ AFR
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Gluster Filesystem Design
Scheduling translators
➢ Adaptive Least Usage (ALU)➢ Non-uniform filesystem architecture (NUFA)➢ Random➢ Rand-Robin➢ Switch
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Gluster Filesystem Design
Adaptive Least Usage (ALU)
➢ disk-usage➢ read-usage➢ write-usage➢ open-files-usage➢ disk-speed-usage
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Gluster Filesystem Design
Non-uniform filesystem architecture (NUFA)
➢ local-volume-name➢ limits.min-free-disk
Random
➢ limits.min-free-disk
Round-Robin
➢ limits.min-free-disk➢ read-only-subvolumes➢ refresh-interval
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Gluster Filesystem Design
Switch
➢ switch.case *jpg:brick1,brick2;*mp3:brick3;*:brick4,brick5➢ switch.read-only-subvolumes brick7
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Gluster Filesystem Design
Other translators
➢ client➢ server➢ posix ➢ posix-locks➢ bdb - very new➢ rot-13➢ trace
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Gluster Filesystem Design
In the feature
➢ Live addition/removal of nodes➢ Automatic File Reordering➢ Web GUI ➢ mod_glusterfs
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Gluster Design
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Benchmarks
Aggregated Read Throughput Benchmark
Multiple dd utility were executed simultaneously with different block sizes to read from GlusterFS filesystem.
4KB 16KB 128KB 256KB 512KB 1024KBLustre 1,796 MB/s 5,782 MB/s 20,423 MB/s 21,582 MB/s 22,789 MB/s 23,731 MB/sGlusterFS 11,415 MB/s 11,424 MB/s 11,427 MB/s 11,419 MB/s 11,411 MB/s 11,409 MB/s
Aggregated Write Throughput Benchmark
Multiple dd utility were executed simultaneously with different block sizes to write to GlusterFS filesystem.
4KB 16KB 128KB 256KB 512KB 1024KBLustre 969 MB/s 1,613 MB/s 1,988 MB/s 1,989 MB/s 1,984 MB/s 1,983 MB/sGlusterFS 1,886 MB/s 2,191 MB/s 2,237 MB/s 2,231 MB/s 2,236 MB/s 2,223 MB/s
Note: Higher means faster.
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Benchmarks
Apache Web Server Benchmark
Apache served 12039 files (595 MB) over HTTP protocol. wget client fetched the files recursively.
TimeLustre Failed after downloading 33 MB out of 585 MB in 11 mins.GlusterFS 3 mins 11 secs
Archive Creation
'tar utility created an archive of 12039 files (595 MB) served through GlusterFS.Time
Lustre 41 secsGlusterFS 25 secs
Archive Extraction
TimeLustre FAILED No space left on device.GlusterFS 43 secs
Note: Lower means faster.
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Sources of Information
Project's site:http://www.gluster.org
Official GlusterFS documentation wiki:http://www.gluster.org/docs/index.php/GlusterFS
On IRC:irc.freenode.net #gluster
The mailing list:[email protected]
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Clusters with GlusterFS
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