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Thread: VPS Disk I/O test
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12-10-2010, 11:09 AM #51Web Hosting Master
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This is in our cloud, so it isn't very fair (because storage is on a SAN):
[root@testserver ~]# dd if=/dev/zero of=test bs=16k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
268435456 bytes (268 MB) copied, 2.36134 seconds, 114 MB/s (limited to 1gbit line because it is a single thread)
Still, on an empty node you should easily get > 20mb/s.
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12-10-2010, 01:07 PM #52Web Hosting Master
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What does that command do?
dd if=/dev/zero of=test bs=16k count=16k conv=fdatasync
Can it be run on live server? Will it wipe out any data?
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12-10-2010, 01:09 PM #53Web Hosting Master
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12-15-2010, 11:37 AM #54WHT Addict
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vpslatch (managed24 server)
dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 26.8052 seconds, 40.1 MB/s
===================
Directspace $2 server:
[root@harber ~]# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 20.5059 seconds, 52.4 MB/s
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12-15-2010, 12:47 PM #55Web Hosting Master
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My Results
For the sake of comparison:
PHOTON VPS:
Code:[root@master ~]# dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync 4096+0 records in 4096+0 records out 268435456 bytes (268 MB) copied, 13.1446 seconds, 20.4 MB/s
Code:root@server [~]# dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync 4096+0 records in 4096+0 records out 268435456 bytes (268 MB) copied, 0.774849 seconds, 346 MB/s
Code:[root@shout2 ~]#dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync 4096+0 records in 4096+0 records out 268435456 bytes (268 MB) copied, 1.82974 seconds, 147 MB/s
Code:[root@backup ~]#dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync 4096+0 records in 4096+0 records out 268435456 bytes (268 MB) copied, 4.51338 seconds, 59.5 MB/s
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12-15-2010, 12:58 PM #56Web Hosting Master
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We have a few nodes undergoing RAID rebuilds, if you can PM your IP I can verify with what's going on with your VPS.
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12-15-2010, 01:10 PM #57Web Hosting Master
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PM sent, let me know when the rebuilds are done (If my node is one of them) and I will run it again.
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12-15-2010, 01:39 PM #58WHT Addict
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One thing I would caution people on are using raw shorterm numbers like these to judge overall performance. Would you have 20MB/s of extremely stable storage on an HA array off the box, or 400MB/s on a Raid0 array? I always recommend people I consult with to take a overall view of performance and availability, and try not to get caught up in benchmarks.
And to be perfectly honest, real world disk usage doesn't come close to saturating interface like dd is capably of. So I would also recommend understanding what TYPE of storage a host is using, versus what raw scores you can come up with.
Case in point, it would take 2 and maybe 3 1G fiber drops to hit the half the 346MB/s, but you could fairly easily hit that number with 4-6 consumer grade sata disks in a single server config. But would you rather have a HA fiber storage cluster that can do 80MB/s and support multiple full server failures, and more bandwidth versus pure speed, or 400MB/s that goes completely down when a single server fails. It's a balancing act, and I think it's our job as providers to better educate consumers, if we want to see the industry grow in the right direction.
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12-15-2010, 02:19 PM #59Web Hosting Master
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Its a fair point you make Linology, I dont know what they all use hardware wise, although from the 2 host website my VPS that got 147MB/s is using SATA II drives in raid 10.
Is there a query I can run from the VPS that would give me a hint or would that need to be ran on the node itself?
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12-15-2010, 07:18 PM #60Web Hosting Master
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12-16-2010, 12:30 PM #61Web Hosting Master
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oh i forgot to add my $1.05 openvz vps from hostrail
Code:[root@storage3 ~]# dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync 4096+0 records in 4096+0 records out 268435456 bytes (268 MB) copied, 7.17027 seconds, 37.4 MB/s [root@storage3 ~]# dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync 4096+0 records in 4096+0 records out 268435456 bytes (268 MB) copied, 6.85732 seconds, 39.1 MB/s [root@storage3 ~]# dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync 4096+0 records in 4096+0 records out 268435456 bytes (268 MB) copied, 6.93566 seconds, 38.7 MB/s
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12-16-2010, 12:35 PM #62Web Hosting Master
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Many people seem to only check the throughput, but random reads/writes are more important. For example the following VMs both do ~100MB/s, but there is a huge difference in performance:
Xenserver vm:
Results: 172 seeks/second, 13.79 ms random access time
Cloud:
Results: 1954 seeks/second, 0.51 ms random access time
The last one is on a VM on our new cloud platform. Seeks can be tested using:
http://www.linuxinsight.com/how_fast_is_your_disk.html
Commands:
wget http://www.linuxinsight.com/files/seeker
chmod +x seeker
./seeker /dev/sda (change this to your disk)
Another test i can recommend is bonnie++. But please stop focussing on these maximum throughput stats
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12-16-2010, 12:52 PM #63Web Hosting Master
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./seeker /dev/sda1
Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sda1 [15360MB], wait 30 seconds..............................
Results: 133 seeks/second, 7.50 ms random access time
yardvps
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12-16-2010, 03:06 PM #64Web Hosting Master
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I think thats a fair point you make hoever it is still a good indication.
I have re ran a few using bonnie++ for consistancy as seeker does not work on openvz.
2host.com VPS (XEN):
Code:Version 1.96 ------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 blahblahblah 1G 320 97 109246 26 34810 2 796 96 131428 5 646.2 0 Latency 34052us 360ms 164ms 18492us 28017us 1719ms Version 1.96 ------Sequential Create------ --------Random Create-------- blahblahblah.com -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 7513 14 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ Latency 10920us 870us 25300us 597us 363us 677us
Code:Version 1.96 ------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 storage3.incepti 1G 43 10 17053 4 40982 7 96 10 175315 10 1137 7 Latency 1469ms 5782ms 145ms 237ms 145ms 6648us Version 1.96 ------Sequential Create------ --------Random Create-------- blahblah.blahblah -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 2201 3 +++++ +++ 6776 8 9548 12 +++++ +++ 1157 1 Latency 145ms 657us 172ms 144ms 144ms 305ms
Code:Version 1.96 ------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 blahbl.ahbalh. 2G 484 97 18222 4 4413 0 333 22 9231 0 154.0 1 Latency 34280us 3735ms 20117ms 503ms 13816ms 3721ms Version 1.96 ------Sequential Create------ --------Random Create-------- blahbl.blahbl.com -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 513 1 +++++ +++ 428 0 2008 3 +++++ +++ 390 0 Latency 1026ms 1473us 330ms 1147ms 77us 120us
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12-16-2010, 03:12 PM #65Web Hosting Master
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not sure thats the best test as the result output is hard to read but if you look closley you can see that they do ok in some areas and not soo good in others.
Only tested a few VPS's above but assuming I am reading that right then the little $1.05 VPS from host rail actualy seems to do better than the PhotonVPS in most areas and the 2host wins overall (shocked)
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12-16-2010, 05:09 PM #66Web Hosting Master
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I did some checking and it appears you're on our older legacy systems with 10K RPM disks in RAID1. The writes on these servers are slower, however the reads will be outperforming. If you wish to move to a RAID10 node, please open a ticket to do so.
One the second note your comparing OpenVZ and Xen and these results will vary. To be fair you should be comparing similar virtualization platforms from different providers.
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12-16-2010, 06:28 PM #67Web Hosting Master
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dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync
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12-16-2010, 06:31 PM #68Web Hosting Master
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The time it takes depends on how fast your server can write the file, which this command is meant to test - sequential throughput. Most likely, your disks are extremely slow and it is still writing the file and not timing out.
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12-16-2010, 09:36 PM #69Web Hosting Master
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My VPS is with KnownHost so I don't think there would be a disk issue. My VPS is running fine. I'm just doing this for haha's. What happens when it's done writing the file? Does a command prompt display, or something else? Thanks.
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12-16-2010, 09:37 PM #70Web Hosting Master
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Look at the original post.
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12-16-2010, 09:44 PM #71Web Hosting Master
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Well it worked immediately this time so I don't know. Maybe I did something wrong. Anyway how is this speed? Thanks.
root@host [~]# dd if=/dev/zero of=test bs=64 count=4k conv=fdatasync
4096+0 records in
4096+0 records out
262144 bytes (262 kB) copied, 0.00844 seconds, 31.1 MB/s
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12-16-2010, 09:54 PM #72Web Hosting Master
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I think you're missing a "k" in bs:
dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync
This outputs a 268mb file which might be a better indicator, rather than writing 262kb.
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12-16-2010, 10:02 PM #73Web Hosting Master
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LOL. Thanks. I'm such a noob. This is better.
root@host [~]# dd if=/dev/zero of=test bs=64k count=4k conv=fdatasync
4096+0 records in
4096+0 records out
268435456 bytes (268 MB) copied, 1.53869 seconds, 174 MB/s
How do I delete the file?Last edited by TheJoker; 12-16-2010 at 10:05 PM.
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12-16-2010, 10:07 PM #74Web Hosting Master
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rm -f test
Nice result!
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12-16-2010, 10:09 PM #75Web Hosting Master
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Well, an update on my VRTServer cloud. I had low expectations due to all their poor reviews, but not this bad. I was kind of hoping it would be half decent though, ah well.
It's gone from ~10MB/s, which was already awful, to:
[root@s2 ~]# dd if=/dev/zero of=test bs=16k count=16k conv=fdatasync
16384+0 records in
16384+0 records out
268435456 bytes (268 MB) copied, 176.499 seconds, 1.5 MB/s
[root@s2 ~]# ./seeker /dev/sda
Seeker v2.0, 2007-01-15, http://www.linuxinsight.com/how_fast_is_your_disk.html
Benchmarking /dev/sda [51200MB], wait 30 seconds.............................
Results: 322 seeks/second, 3.10 ms random access time
Asked them to look into it, never heard back. It's cancelled now.
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