High number of writes in SSD - LVM setup with EXT4

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sinholueiro

New Member
Feb 2, 2024
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Hello all. I have a Proxmox setup in a new 970 Evo Plus 1TB. The SMART number of reads are normal, but the numer of bytes written is absurdly high. I have a ZFS mirror with 2x8TB HDDs but the SSD with the VMs is the basic LVM setup with EXT4. The writes are also constant, so I am a bit clueless. Do any of you have any idea what's going on?
Screenshot of my monitoring:

dKsMYwx.png
 
Looks like normal write amplification of consumer drives. PVE constantly writes very small batches for the internal /etc/pve database and all rrdtool graph metrics.
 
From 2 TiB to 17 TiB on an ext4 in less than 30 days? I don't think that's normal. Roughly speaking, the disc would then have to be finished in around 33 months.

But, the write load seems to be constant, so you should take a look at what VMs you have set up. The cause may simply be in a VM and not in Proxmox VE or Debian itself.
 
The VMs have been in a SN500 for 4 years in ESXi and did not cause this usage. Also, the writes are constant, if it was some VM, the disk will get full, the VM disks together are 150GB at most.
 
sinholueiro said:
if it was some VM, the disk will get full,
Click to expand...
That doesn't have to be true. A high write load does not always mean that the storage space used increases. It can be temporary data that is then deleted again.
 
I am looking at iotop and I don't see high usage from any VM, they are in the KB/s range. Also, there are no other process that shows significant write usage. Let's remember that in the last day, it written 630GB, it should show something.
 
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