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Shadow Hosting Review of the Shadow Hosting VPS 4 - I'm Impressed !!
#11
I think it is wonderful that the HDD from Manal gives such high performance, normally HDD has reasonable speeds but these speeds are indeed comparable with SSD for a 1gbps network uplink. Carry on @Manal!
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#12
Excellent and highly detailed review! I really enjoyed reading through it. I can tell you put in so much effort into it.

And wow is VPS 4 such a beast!!! I never knew we had a 10GB RAM VPS over here... and the 300GB storage is just amazing!!! Not to mention how powerful the CPU is... brilliant!
Special thanks to Post4VPS and VirMach for providing me with VPS9! It is insanely powerful and fast!
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#13
Hello there!.. @rudra

Sorry for the late comment. I did saw this review back when it was posted, but given its richness information-wise, I just postponed this post to when I have other data to compare it with.

I noticed that most of your benchmarks were directed to testing the performance of your disk I/O, which is understandable, given that's where bottlenecks always are. The data you came up with also served me to try a comparison between VPS4 HDD, VPS16 SSD, @Hidden Refuge 's NanoKVM box's NVMe, my NanoKVM box SSD and my VPS9 SSD.

The idea was to make sense of how reliable those bench scores are in comparing disk I/O performance even in the limited way of sequential read/write--given that's all we have published here.

So, to complete the picture, I'm still missing few data-point from you :

> I've noticed that, in your dd-based disk seq. write test, you didn't use the standard values (ie the values used in Hidden's bench script) and the fdatasync flag. Running instead the following command:
sync; dd if=/dev/zero of=tempfile bs=1M count=1024; sync

Which isn't the same as running:
dd if=/dev/zero of=tempfile bs=1M count=1024 conv=fdatasync;

So, can we please have the output of this command run 3 times (mimicking HR's I/O script.)
dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync && rm -f test

When comparing data, we need to stick to the same script for the comparison to make any sense. Granted, that the test doesn't have much weight in itself, but it's just a data-point for comparison purposes.

> Also, I'm curious about your I/O controllers: storage and network. I'm expecting it to be of the Virtio type. So please give us a feedback on those 2 commands:
lshw -class disk
lshw -class network

Apart from the above, your review is EPIC, on par with Hidden's reviews of VPS-16 and his NanoBox. Kudos for both of you!

And +1Rep for this review.
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#14
thanks fChk for your appreciation !
I used that dd command cause to me that seemed to be closer to the real / available / usable performance. I agree that it is usually the speed of write to write cache. But that is what we experience in our normal use.

using conv fdatasync asks the os to write from write cache to physical disk before dd exits. so here all the writes are first done to the cache and then purged to the disk. i guess it has a component of write to the disk time. so may be that's why some consider it as the measure of disk performance in a system. but in today's computers of huge cache and parallel access requests, cache purging to the disk time may not be that noticeable in real usage, unless the system is bogged down by write requests to overflow the cache...lol

oflag direct or dsync etc flag is kinda the synchronous access speed ....one may say the real speed of the disk.

i will do what you have requested when i get time and post for you. thanks again !!
Sincere Thanks to Shadow Hosting and post4vps  for my awesome vps4. Also a big thanks to cubedata for the great experience on my previous vps, vps8.
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#15
(04-05-2020, 07:48 AM)Pacific Spirit Wrote:  I think it is wonderful that the HDD from Manal gives such high performance, normally HDD has reasonable speeds but these speeds are indeed comparable with SSD for a 1gbps network uplink. Carry on @Manal!

yeah i also use Manal / Shadow Hosting VPS . and the speed is great . it used to be handling my extremely spiking website fine with some tweak (i use ineffective mysql query . replacing that and the server worked great again) . the specs show that it use HDD

but for the SSD like speed it maybe use SSD caching or raiding many hdd (most server raid their HDD )
Terminal
humanpuff69@FPAX:~$ Thanks To Shadow Hosting And Post4VPS for VPS 5
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#16
(05-27-2020, 12:15 PM)rudra Wrote:  thanks fChk for your appreciation !
I used that dd command cause to me that seemed to be closer to the real / available / usable performance. I agree that it is usually the speed of write to write cache. But that is what we experience in our normal use.

using conv fdatasync asks the os to write from write cache to physical disk before dd exits. so here all the writes are first done to the cache and then purged to the disk. i guess it has a component of write to the disk time. so may be that's why some consider it as the measure of disk performance in a system. but in today's computers of huge cache and parallel access requests, cache purging to the disk time may not be that noticeable in real usage, unless the system is bogged down by write requests to overflow the cache...lol

oflag direct or dsync etc flag is kinda the synchronous access speed ....one may say the real speed of the disk.
Exactly!... I was convinced that you knew what you're doing!... But, disk performance tests should be about the disk not system caches; or at least showing both to get an idea of how the disk performs on its own and how much boost it gets when system caches enter the scene (as is the case in practice.)

Besides, presented as you did, people not paying much attention into those numbers meaning, get the wrong idea:
(04-05-2020, 07:48 AM)Pacific Spirit Wrote:  I think it is wonderful that the HDD from Manal gives such high performance, normally HDD has reasonable speeds but these speeds are indeed comparable with SSD for a 1gbps network uplink. Carry on @Manal!


(05-27-2020, 12:15 PM)rudra Wrote:  i will do what you have requested when i get time and post for you. thanks again !!
No rush, take your time!
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