2016年8月26日開催の、SNIA日本支部主催「2016年度第1回最新技術動向講演会」で発表された資料です。 http://www.snia-j.org/storage_networking/news/number/200.html

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Number of Bricks: 1 x (2 + 1) = 3
Redundancy

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# gluster volume get <Volume名> all
struct volume_options options[] = {
...
{ .key = {"page-size"},
.type = GF_OPTION_TYPE_SIZET,
.min = 4096,
.max = 1048576 * 64,
.default_value = "131072",
.description = "Page size with which read-ahead performs server I/O”
}

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.(mount point)
foo/
sample.txt
.(brick dir)
.glusterfs
47/
03/
4703ed86-72b5-4573-997c-7e2339e2b1d7
foo/
sample.txt
# getfattr -d -e hex -m . foo/sample.txt
# file: foo/sample.txt
trusted.bit-rot.version=0x020000000000000057a08889000abad6
trusted.ec.config=0x0000080301000200
trusted.ec.size=0x0000000000000007
trusted.ec.version=0x00000000000000010000000000000001
trusted.gfid=0x4703ed8672b54573997c7e2339e2b17d7

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1. d2r2 をFUSEマウント
GlusterFSのクラスタなら
どこでも良い
2. 書き込み
3. DHT(分散ハッシュテーブル) から書き込み先を決定
4. Brickに file1 を書き込み

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Brick1 Brick2 Brick3
/dir1 0 - 99 100 - 199 200 - 299
/dir2 100 - 199 400 – 499 300 - 399
/dir3 500 - 599 200 - 299 100 - 199

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echo "deadline" > /sys/block/<block name>/queue/scheduler
echo "256" > /sys/block/<block name>/queue/nr_requests
echo "16" > /proc/sys/vm/page-cluster
sysctl -w vm.swappiness=10
sysctl -w vm.dirty_background_ratio=1
sysctl -w kernel.sched_wakeup_granularity_ns=15
sysctl –w vm.vfs_cache_pressure=50
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PRUNEFS = “fuse.glusterfs”
PRUNEPATHS = “<Brick Directory>”

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gluster volume set <VOLNAME> cluster.entry-self-heal off
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mount –t xfs –o inode64,noatime,nodiratime,attr2,delaylog,noquota

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