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Ceph Day Berlin: Erasure Code in Ceph
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Ceph Day Berlin: Erasure Code in Ceph
1.
Erasure Code in
Ceph Loic Dachary @ Red Hat
2.
Save Space
3.
5 minutes role
playing game
4.
XOR
5.
3 peta =>
1.3 peta
6.
Harder object mutations
/ recovery
7.
Simple operations and
tiering Replicated Erasure Coded
8.
Promoted to replica
on read Replicated Erasure Coded
9.
Sam & David
: internals
10.
Janne & Andreas
& Loic & Takeshi erasure code
11.
Released May 2014
: Firefly
12.
Why save space
before shortage ?
13.
Reliability Model ● After
an OSD is lost ● Recovery ● Backfilling a new OSD
14.
April 2015 :
Hammer
15.
Repair K=10, M=4
16.
Locally Recoverable Codes LRC
@ Red Hat
17.
SHEC Takeshi @
Fujitsu
18.
ISA plugin Yuan
@ Intel SIMD aka SSE2, SSE3, SSE4 Only for Intel processors ~50% Faster
19.
jerasure ARM Janne
@ ARM
20.
Infernalis
21.
Hitchhiker Rashmi @
U.C. Berkeley
22.
ldachary@redhat.com Artwork GPLv3+ Tartaruga
Feliz
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