New on LowEndTalk? Please Register and read our Community Rules.
All new Registrations are manually reviewed and approved, so a short delay after registration may occur before your account becomes active.
All new Registrations are manually reviewed and approved, so a short delay after registration may occur before your account becomes active.
Comments
What is 1 MB/s? There's many possible metrics for disk performance.
Also, what's the disk performance on the host node like?
io speed
good point.
Maybe the disks are syncing? Checkout
Sync is completed
The KVM VM is running windows
You still haven't said what disk performance on host is like, what kind of test you're doing and seeing 1 MB/s (no, io speed doesn't mean shit). Also what's disk cache setting in VM?
I am using Direct Sync.
ON host
dd
1073741824 bytes (1.1 GB) copied, 7.34427 s, 146 MB/s
oops.... I just wipe my server with dd.......
I.. I don't even... How.. sigh.
I don't know the specifics of your hardware setup and what specific test you are using but I don't see that issue at all with Proxmox + Software RAID 1.
what's the correct command to test IO speed with DD?
dd if=/dev/null of=/dev/null bs=64k count=16k conv=fdatasync
You need to specify of file to use fdatasync, otherwise I get error:
I don't quite understand of= and use of=/dev/sda1 so hard drive wiped.
Yeah you shouldn't run anything as root. Always use test account. Only root would be able to write to disk directly. And of can be device or regular file, when you set regular file you can do test of sequential read/write speed on top of the filesystem. Did you lose important data or what? Otherwise just reinstall OS o_O
The command usually use is:
Remember to delete the test file created.
From Windows Assessment, Disk Sequential 64 Read 535 MB/s Disk Random 16 Read 1.94MB/s