Diagnostics of the performance of the disk subsystem Proxmox, ZFS, KVM. By what means?

Question

ZFS

I ask for help with the diagnosis of the ZFS - Proxmox disk subsystem.
2 Sata drives Raid1. Disks are new. smart ok.
To get started, how do you test disk performance from the host?
I try
[email protected]:~# dd bs=10M count=1024 if=/dev/zero of=test oflag=dsync
1024+0 records in
1024+0 records out
10737418240 bytes (11 GB, 10 GiB) copied, 40.2132 s ;
_
_
_ 5.61 4.16 89.36
sdb 0.00 0.20 33.20 181.40 0.00 3839.20 35.78 2.02 9.47 29.69 5.76
4.08
87.60 count=10240 if=/dev/zero of=test oflag=dsync
10240+0 records in
10240+0 records out
10737418240 bytes (11 GB, 10 GiB) copied, 138.877 s, 77.3 MB/s
Device: rrqm/s wrqm/ sr/sw/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 74.80 124.00 0.00 1499.20 15.08 1.36 6.83 10.90 4.37 4.16 82.72
sdb 0.00 0.00 74.80 123.60 0.00 1499.20 15.11 1.49 7.50 11.80 4.89 4.60 91.20
[email protected]:~# dd bs=4K count=10240 if=/dev/zero of=test oflag=dsync
10240+0 records+ in
103
records04 bytes (42 MB, 40 MiB) copied, 96.4112 s, 435 kB/s
Device: rrqm/s wrqm/sr/sw/s rkB/s wkB/
s 110.40 117.20 0.00 1073.60 9.43 0.96 4.23 8.04 0.65 4.01 91.20
SDB 0.00 0.20 110.20 117.20 0.00 1073.60 9.44 1.02 4.47 8.00 1.16 3.98 90.56
This is the actual speed of the disks (in DD output)? can you navigate it?
Side question.
iostsat lists block device names as zdXX. how can they be associated with virtual machine disks?
Device: RRQM / S WRQM / SR / SW / S RKB / S WKB / S avgrq-sz avgqu-sz await r_await w_await svctm% Util
SDA 0.00 0.20 107.00 116.00 0.00 1075.20 9.64 0.76 3.42 6.43 0.63 3.22 71.84 SDB
0.00 0.40 107.00 116.20 0.00 9.63 0.84 3.75 1075.20 6.25 1.45 3.13 69.92
zd0 0.00 0.00 0.00 0.60 0.00 2.40 8.00 0.00 0.00 0.00 0.00 0.00 0.00
zd48 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
zd96 0.00 0.00 0.20 0.00 0.80 0.00 8.00 0.00 0.00 0.00 0.00 0.00 0.00

Answer 1

I'll just leave this here

Answer 2

if performance is important to you, then abandon zfs towards lvm , it
has already been verified that zfs has problems with performance, even if you give it a lot of memory