Proxmox default instalation

[yarii]

After default instalation, after zpool create zfs1 raidz2 /dev/disk/sd{b,c,d,e,f,h}

I have:

root@vps1:/sys/block/sda/queue# cat /sys/block/sd{b,c,d,e,f,h}/queue/physical_block_size
4096
4096
4096
4096
4096
4096

and:

root@vps1:/sys/block/sda/queue# cat /sys/block/sd{b,c,d,e,f,h}/queue/logical_block_size
512
512
512
512
512
512

1. Is it worth to change the logical size? (performance difference)
2. How to change the logical size without/low downtime?

Regards.

 

[chalex]

I don't think you can change those values, those are the values reported by your hardware. That's how I understand it.

 

[yarii]

Yes You can change it when creating partitions see fdisk manual.
But is it really worth to do this? And why proxmox installer creates 512 partitions instead of 4Kn?

 

[chalex]

Are you sure your physical devices are 4Kn? E.g. an INTEL SSDSC2KB960G7

# smartctl --all /dev/sdb |grep "Sector Sizes"
Sector Sizes: 512 bytes logical, 4096 bytes physical

You can use the 'ashift=12' parameter when creating your zpool if you want to be able to add 4kn devices in the future.

 

[yarii]

Yes I used ashift when I was creating zpool.

smartctl --all /dev/sdb |grep "Sector Sizes"
Sector Sizes: 512 bytes logical, 4096 bytes physical