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Re: [linux-lvm] Testing the new LVM cache feature



Many thanks to Alasdair and Heinz for the hint with the tagging feature.
More convenient than dealing with UUIDs.

I also stumbled across the "same VG" issue when I tried to set up the
test environment. Thanks to Richard for that hint. :-)

I ran bonnie++ on my X230 (RHEL7) here where I used an external USB3
SSD. Attached you find the results.

With cache, there is a significant difference in random create. That's
what I would expect from an SSD cache.

Werner
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Charles Cachera

Title: Bonnie++ Benchmark results

Bonnie dm-cache first run without cache

Version 1.96Sequential OutputSequential InputRandom
Seeks
Sequential CreateRandom Create
SizePer CharBlockRewritePer CharBlockNum FilesCreateReadDeleteCreateReadDelete
K/sec% CPUK/sec% CPUK/sec% CPUK/sec% CPUK/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU
dhcp86.gold31176M188894795273329692407198883003179.36161334535++++++++25022301302134++++++++2595034
Latency5022us282ms223ms3349us258ms686msLatency26160us82us86us11553us97us1232us

Bonnie second Run without cache

Version 1.96Sequential OutputSequential InputRandom
Seeks
Sequential CreateRandom Create
SizePer CharBlockRewritePer CharBlockNum FilesCreateReadDeleteCreateReadDelete
K/sec% CPUK/sec% CPUK/sec% CPUK/sec% CPUK/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU
dhcp86.gold31176M191293803263328872412898883363187.06161341435++++++++29374361736845++++++++2368330
Latency4963us100ms227ms6850us227ms310msLatency1006us89us80us7576us7us2120us

Bonnie with cache 20 GB SSD USB3

Version 1.96Sequential OutputSequential InputRandom
Seeks
Sequential CreateRandom Create
SizePer CharBlockRewritePer CharBlockNum FilesCreateReadDeleteCreateReadDelete
K/sec% CPUK/sec% CPUK/sec% CPUK/sec% CPUK/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU
dhcp86.gold31176M187494793173333813349290898124175.46161137330++++++++22227271231232++++++++2712935
Latency4787us99756us1725ms66649us247ms421msLatency9701us99us440us957us9us2139us

50 GB SSD USB3 Volume

Version 1.96Sequential OutputSequential InputRandom
Seeks
Sequential CreateRandom Create
SizePer CharBlockRewritePer CharBlockNum FilesCreateReadDeleteCreateReadDelete
K/sec% CPUK/sec% CPUK/sec% CPUK/sec% CPUK/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU/sec% CPU
dhcp86.gold31176M2009992227989759335418299259103832318316++++++++++++++++++++++++++++++++++++++++++++++++
Latency6191us99859us21786us2753us5604us7597usLatency1157us83us72us1069us8us2128us

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