Ian Collins via smartos-discuss wrote:
Greg Zartman via smartos-discuss wrote:
Are there performance issues or hits by sharing a zfs volume from the
global zone to a kvm instance? I have several volumes being mounted
by a centos vm and performance is pretty sluggy. For example, I'm
getting itermittent loss of connection and pauses in disk read/write.
The machine this is running on has fairly respectable hardware, so
I'm surprised to see this.
Thoughts? Thanks!
Interesting. I was going to run some tests with this configuration this
weekend. I was wondering whether using an etherstub for a private LAN
would perform any better than using a IP address on the GZ.
Might be worth a try. If you don't, I will
Well I did and the numbers don't make for pleasant reading.
I tested using bonnie++ in an Ubuntu KVM instance.
On an attached virtual drive:
Version 1.97 ------Sequential Output------ --Sequential Input-
--Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec %CP
Ubuntu-14-04 16G 956 99 155466 27 40159 9 3986 0 103832 22
509.9 25
Latency 17029us 307ms 793ms 185ms 327ms 132ms
Version 1.97 ------Sequential Create------ --------Random
Create--------
Ubuntu-14-04 -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
16 32313 83 +++++ +++ +++++ +++ 31555 84 +++++ +++
+++++ +++
Latency 1056us 252us 283us 132us 45us 198us
NFS mount via an etherstub:
Version 1.97 ------Sequential Output------ --Sequential Input-
--Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec %CP
Ubuntu-14-04 16G 1912 96 44931 15 26405 10 4557 93 61196 19
795.4 28
Latency 9781us 15855ms 2371ms 44658us 623ms 165ms
Version 1.97 ------Sequential Create------ --------Random
Create--------
Ubuntu-14-04 -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
16 548 6 +++++ +++ 918 13 552 6 2323 20
894 15
Latency 81724us 12634us 11561us 9828us 4848us 6129us
NFS mount via an GZ public IP:
Version 1.97 ------Sequential Output------ --Sequential Input-
--Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block--
--Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP
/sec %CP
Ubuntu-14-04 16G 1861 96 57995 19 27129 10 4636 81 61500 19
807.4 26
Latency 4565us 5599ms 2683ms 71803us 647ms 168ms
Version 1.97 ------Sequential Create------ --------Random
Create--------
Ubuntu-14-04 -Create-- --Read--- -Delete-- -Create-- --Read---
-Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
/sec %CP
16 578 6 +++++ +++ 902 14 555 7 2317 19
870 12
Latency 10856us 9363us 20864us 30390us 932us 6692us
During the tests, the log devices were way more active on the attached
virtual drive test than the NFS tests.
--
Ian.
-------------------------------------------
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