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disks are SSD, but /sys/block/vdb/queue/rotational says it's rotational - should i worry?

“echo 1 > /sys/block/sdX/device/delete” on all disks except predetermined listSSD seems full, but file system says otherwise

1

Is it a problem when the system believes a device to be rotational, but it is SSD really? The system is:

• Ubuntu 18.04


• KVM virtualized


• I have /dev/vda as "local", /dev/vdb as "isilon"; I'm interested primarily in vda (see background below)


• The provider says "[/dev/vda is] a SSD raid 6 array within the HV"


• cat /sys/block/vd?/queue/rotational
1
1



• lsblk -d -o name,rota
NAME ROTA
sr0 1
vda 1
vdb 1




• it's fast (dd random test according to https://serverfault.com/questions/551453/how-do-i-verify-that-my-hosting-provider-gave-me-ssds/551495#551495; takes 1.379s; However, it's emtpy still)



• driver: virtio_blk

Is this configured correctly? Should I worry once there's data, and Elasticsearch running on /dev/vda (or /dev/vdb)?

Background: I'm installing elsasticsearch and was checking if the SSD scheduler is correct, but as the system doesn't see the disks as SSD, it comes back with

cat /sys/block/vda/queue/scheduler
[none]

hard-disk kvm ssd

share|improve this question

asked yesterday

ynuxynux

1062

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Depending on the services that require to use that disk there can be some impact. I'm familiar with this in ceph context on HP servers, where the OSD metadata depends on the correct configuration. We use a custom udev rule with a small script that sets the rotational flag correctly. If you encounter any issues in the present configuration I would suggest to do so, too.
  
  – eblock
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Use virtio-scsi, not virtio-blk.
  
  – Michael Hampton
  yesterday
  

  
  
  
  

add a comment | 

1

Is it a problem when the system believes a device to be rotational, but it is SSD really? The system is:

• Ubuntu 18.04


• KVM virtualized


• I have /dev/vda as "local", /dev/vdb as "isilon"; I'm interested primarily in vda (see background below)


• The provider says "[/dev/vda is] a SSD raid 6 array within the HV"


• cat /sys/block/vd?/queue/rotational
1
1



• lsblk -d -o name,rota
NAME ROTA
sr0 1
vda 1
vdb 1




• it's fast (dd random test according to https://serverfault.com/questions/551453/how-do-i-verify-that-my-hosting-provider-gave-me-ssds/551495#551495; takes 1.379s; However, it's emtpy still)



• driver: virtio_blk

Is this configured correctly? Should I worry once there's data, and Elasticsearch running on /dev/vda (or /dev/vdb)?

Background: I'm installing elsasticsearch and was checking if the SSD scheduler is correct, but as the system doesn't see the disks as SSD, it comes back with

cat /sys/block/vda/queue/scheduler
[none]

hard-disk kvm ssd

share|improve this question

asked yesterday

ynuxynux

1062

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Depending on the services that require to use that disk there can be some impact. I'm familiar with this in ceph context on HP servers, where the OSD metadata depends on the correct configuration. We use a custom udev rule with a small script that sets the rotational flag correctly. If you encounter any issues in the present configuration I would suggest to do so, too.
  
  – eblock
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Use virtio-scsi, not virtio-blk.
  
  – Michael Hampton
  yesterday
  

  
  
  
  

add a comment | 

Is it a problem when the system believes a device to be rotational, but it is SSD really? The system is:

• Ubuntu 18.04


• KVM virtualized


• I have /dev/vda as "local", /dev/vdb as "isilon"; I'm interested primarily in vda (see background below)


• The provider says "[/dev/vda is] a SSD raid 6 array within the HV"


• cat /sys/block/vd?/queue/rotational
1
1



• lsblk -d -o name,rota
NAME ROTA
sr0 1
vda 1
vdb 1




• it's fast (dd random test according to https://serverfault.com/questions/551453/how-do-i-verify-that-my-hosting-provider-gave-me-ssds/551495#551495; takes 1.379s; However, it's emtpy still)



• driver: virtio_blk

Is this configured correctly? Should I worry once there's data, and Elasticsearch running on /dev/vda (or /dev/vdb)?

Background: I'm installing elsasticsearch and was checking if the SSD scheduler is correct, but as the system doesn't see the disks as SSD, it comes back with

cat /sys/block/vda/queue/scheduler
[none]

hard-disk kvm ssd

share|improve this question

asked yesterday

ynuxynux

1062

share|improve this question

asked yesterday

ynuxynux

1062

share|improve this question

asked yesterday

ynuxynux

1062

asked yesterday

ynuxynux

1062

asked yesterday

ynuxynux

1062