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SSD or HDD ?
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SSD or HDD ?

Hello everybody

Two days ago I Buy a server VPS

His node claims to be discs SSD , But after the purchase it turned out that it was not tablets SSD They are tablets HDD

But his node sticks to that disk SSD

I want your experience , Do tablets SSD or HDD ?

or see

[[email protected] ~]# cat /sys/block/sd*/queue/rotational
1
[[email protected] ~]# lsblk -o NAME,ROTA
NAME ROTA
sda 1
|-sda1 1
`-sda2 1
[[email protected] ~]# smartctl -a /dev/sda | grep 'Rotation Rate'
[[email protected] ~]# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: QEMU HARDDISK Rev: 3
Type: Direct-Access ANSI SCSI revision: 05
[[email protected] ~]# cat /sys/block/sda/queue/rotational
1
[[email protected] ~]#

I thank you who cares about it

Comments

  • hawchawc Member, Moderator, LIR

    Which host is this?

  • WSSWSS Member

    QEMU is an emulated drive. You do not have direct access to the subsystem, and obviously are not very knowledgeable about how emulation works, despite knowing a bit of linux.

    If you are complaining about speed, ask them to change it to 'virtio', and reinstall for that, as the disk and network will be faster.

    Thanked by 1Aidan
  • @hawc said:
    Which host is this?

    I can not tell you because it's called defamation

  • @WSS said:
    QEMU is an emulated drive. You do not have direct access to the subsystem, and obviously are not very knowledgeable about how emulation works, despite knowing a bit of linux.

    If you are complaining about speed, ask them to change it to 'virtio', and reinstall for that, as the disk and network will be faster.

    Thank you

    All I want to know is it SSD or HDD ?

    Server it KVM

  • WSSWSS Member

    Do some thoroughput tests on it.

  • @WSS said:
    Do some thoroughput tests on it.

    What is the test?

  • Random read/write performance

    Random read performance

    Random write performance

    Measuring latency with IOPing

    Thanks for your interaction

    Wait for an answer

  • IonSwitch_StanIonSwitch_Stan Member, Host Rep

    TLDR

    That looks like some slow/throttled SSD, much faster than a couple disk can do.

    Summary

    Disk performance has two major benchmarks we look at - io operations per second (IOPS) and throughput. DIsk latency can be considered a third metric some look at.

    IOPS

    Your benchmarks show ~2600 read/ ~2200 write IOPS. Spinny HDD's vary in performance from ~75 to ~125 IOPS per disk depending on type. Your performance is similar to 26 disks (all very simple math -- not completely accurate) in a RAID set, or more likely a throttled SSD.

    Thats not great performance. Our SSD arrays (RAID10 6 disk) will provide ~65k iops. An NVME host will run 100+ k/iops.

    Throughput

    Harder to assert throughput from Random IO. This usually isn't expected to be very high -- try a sequential test to see what the sequential IO is. Your likely being throttled here as well.

    Thanked by 1uptime
  • WSSWSS Member

    You're on a shared SSD.

    Thanked by 1Aidan
  • WSSWSS Member

    If you reinstall after changing the disk device to VirtIO, it will be faster, but I can't give you any specific metrics.

  • SmallWebSmallWeb Member, Provider

    @WSS said:
    If you reinstall after changing the disk device to VirtIO, it will be faster, but I can't give you any specific metrics.

    You're gonna hit your niceness quota early this year!

    Michael from SmallWeb - Please use official support methods for help.

  • WSSWSS Member
    edited January 2018

    @Ho-ost said:
    You're gonna hit your niceness quota early this year!

    Sobriety is a bitch.

  • ramnetramnet Member, Provider
    edited January 2018

    As has already been pointed out, that's an emulated drive.

    What is more important than anything, is how well managed the system is by your host.

    If you are not happy with the performance, then change hosting companies.

    Silly benchmarks are mostly pointless, especially in a variable and changing environment like a vps host node is.

  • WSSWSS Member

    @ramnet

    No match for "SMALLKVM.COM".
    No match for "MEDIUMKVM.COM".
    No match for "LARGEKVM.COM".
    
  • @WSS said:
    @ramnet

    No match for "SMALLKVM.COM".
    No match for "MEDIUMKVM.COM".
    No match for "LARGEKVM.COM".
    

    So what? They're all loosers anyway. Real experience professionals only accept "hosted on an ipad [insert current version]".

    Side note: Be sure to ask your provider for what graphics cards they use for the best KPTI experience!

    My favourite prime number is 42. - \forall cpu in {intel, amd, arm}: cpu->speed -= cpu->speed/100 x irandom(15, 30) | state := hacked

  • WSS said: If you reinstall after changing the disk device to VirtIO

    Do you need to do a reinstall or does Shutdown and Boot suffice?

  • @brueggus said:

    WSS said: If you reinstall after changing the disk device to VirtIO

    Do you need to do a reinstall or does Shutdown and Boot suffice?

    Depends on your distribution: some distros streamline the initramfs to only include kernel modules for the hardware that was detected at installation time, so your initramfs would be unable to access the drive with the root filesystem if it suddenly changes to a virtio device.
    However, most distros default to including a set of common driver modules in the initramfs, or even have them included in the kennel binary (i.e. non-modular), in which case the switch to virtio wouldn't be an issue.

    Also note that going from emulated hardware to virtio will change the naming of the drive (usually from sda to vda). You shouldn't hardcode those names anyway, but if you did you'll be in trouble.

    My suggestion: just try the upgrade. If anything stops working, either boot a rescue system and fix things if you're knowledgeable enough with Linux, or hit the reinstall button if you're not.

    Thanked by 2brueggus uptime

    Favourite providers (recommended for their reliable service, not their referral payouts): UltraVPSLiteServerVultr

    It's not that I'm an angry person, it's just that everything is terrible and nobody else seems to care.

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