Date: Mon, 8 Jan 2007 22:57:14 -0500 From: "Ahnjoan Amous" <ahnjoan@gmail.com> To: freebsd-geom@freebsd.org Subject: GEOM mirror performance - slow Message-ID: <5e575c8a0701081957k43483e1ewf9b27022ae330d8a@mail.gmail.com>
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I'm sorry about the double posting, I have switch e-mail clients and
hope that the text is now understandable.
While deploying 6.1-RELEASE I'm seeing slower than expected speed
using geom mirror.
Test 1. Outside of GEOM I'm able to write to both aacd2 and
aacd3 concurrently and achieve between 41M =96 45M a second write
speeds. (around 75M a second if I run the commands separately)
Test 2. Inside a GEOM container but not mirrored (aacd2 =3D gm2,
aacd3 =3D gm3) I'm able to write to both gm2 and gm3 concurrently
and achieve between 40M =96 49M a second write speeds. (around 75M
a second if I run the commands separately)
Test 3. Inside a GEOM mirror (gm1 =3D aacd2 =3D aacd3) I'm able to
achieve 23M a second.
I'd love someones opinion as to if the speed I'm seeing using
GEOM mirror is to be expected.
FYI =96 The mirror was manually rebuilt and COMPLETE before tests
were attempted on the mirror.
***********************************************************************
*** Test 1.
*** dd to devices mounted outside of geom
> dd if=3D/dev/zero of=3D/data02/helloworld bs=3D8k count=3D100k &
> dd if=3D/dev/zero of=3D/data03/helloworld bs=3D8k count=3D100k &
838860800 bytes transferred in 18.799345 secs (44621810 bytes/sec)
^^^^^^^^
838860800 bytes transferred in 18.544963 secs (45233889 bytes/sec)
^^^^^^^^
> dd if=3D/dev/zero of=3D/data02/helloworld bs=3D1m count=3D800 &
> dd if=3D/dev/zero of=3D/data03/helloworld bs=3D1m count=3D800 &
838860800 bytes transferred in 20.014247 secs (41913183 bytes/sec)
^^^^^^^^
838860800 bytes transferred in 19.824656 secs (42314016 bytes/sec)
^^^^^^^^
**** setup info for test ****
> df -k
/dev/aacd2s1e 2026030 819620 1044328 44% /data02
/dev/aacd3s1e 2026030 819620 1044328 44% /data03
***********************************************************************
*** Test 2.
*** dd to devices mounted as their own geom volumes
> dd if=3D/dev/zero of=3D/data02/helloworld bs=3D8k count=3D100k &
> dd if=3D/dev/zero of=3D/data03/helloworld bs=3D8k count=3D100k &
838860800 bytes transferred in 17.118679 secs (49002659 bytes/sec)
^^^^^^^^
838860800 bytes transferred in 16.810787 secs (49900150 bytes/sec)
^^^^^^^^
> dd if=3D/dev/zero of=3D/data02/helloworld bs=3D1m count=3D800 &
> dd if=3D/dev/zero of=3D/data03/helloworld bs=3D1m count=3D800 &
838860800 bytes transferred in 20.907455 secs (40122569 bytes/sec)
^^^^^^^^
838860800 bytes transferred in 20.638277 secs (40645874 bytes/sec)
^^^^^^^^
**** setup info for test ****
> df -k
/dev/mirror/gm2 2026030 819620 1044328 44% /data02
/dev/mirror/gm3 2026030 819620 1044328 44% /data03
> gmirror list
Geom name: gm2
1. Name: aacd2s1e
Geom name: gm3
1. Name: aacd3s1e
***********************************************************************
*** Test 3.
*** dd to devices mounted as a geom mirror
> dd if=3D/dev/zero of=3D/data01/helloworld bs=3D8k count=3D100k
838860800 bytes transferred in 35.622392 secs (23548694 bytes/sec)
^^^^^^^^
> dd if=3D/dev/zero of=3D/data01/helloworld bs=3D1m count=3D800
838860800 bytes transferred in 35.588491 secs (23571126 bytes/sec)
^^^^^^^^
**** setup info for test ****
> df -k
/dev/mirror/gm1 2026028 819620 1044326 44% /data01
> gmirror list
Geom name: gm1
1. Name: aacd2s1e
2. Name: aacd3s1e
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