Language:
switch to room list switch to menu My folders
Go to page: First ... 44 45 46 47 [48]
[#] Sat Jun 01 2024 10:37:28 EDT from Nurb432

[Reply] [ReplyQuoted] [Headers] [Print]

Backing up 4TB VM across the network, for a disk swap in a server...... Zzzzzzz      Donno why its so slow.  CPU on either box isn't taxed at all ( sub 10% ),  network is loafing @ 120mb on a 1g switch.. Every other VM is turned off to reduce bus traffic.  Drives are not high end but not super cheap either. Source is an SSD.. Destination drive on the backup server ( proxmox ) isn't the fastest around, it is a spinny disk to save cost but not slow either.   I forget the rates now, but i have tested the drives on the same hardware and it was several times write/read speed max and about ' average ' in the bigger picture.

Last time i did this it was onto an external USB as that was the largest disk i had handy ( 8tb ), so i did expect some slowness, even tho it was still USB3. But its about the same speed .. 

read: 123.3 MiB/s, write: 116.8 MiB/s   ( average update each block )

There is some compression going on, but with cpu so low, that isn't the bottleneck either.. 

Not end of world, its not like some mission critical NSA datacenter here..  mostly just my NAS and streaming front end so i can watch videos and music on the big screen...  just seems odd to me.



[#] Tue Jun 04 2024 21:03:58 EDT from zelgomer

[Reply] [ReplyQuoted] [Headers] [Print]

2024-06-01 14:37 from Nurb432 <nurb432@uncensored.citadel.org>
Backing up 4TB VM across the network, for a disk swap in a
server...... Zzzzzzz      Donno why its so slow.  CPU on either

I like to attach to those with strace -tp, sometimes it exposes stupid stuff like needless sleeps or stalls waiting on something you don't expect.

[#] Wed Jun 05 2024 07:36:02 EDT from Nurb432

[Reply] [ReplyQuoted] [Headers] [Print]

Apparently its not just me. Others have similar issues.  Something i may look into more someday and give the dev guys facts/ideas.  But will want to test on true server level hardware, eliminate any possible workstation level bus  bottlenecks.

If i ever go back to consulting, ill do some other form of backup ( perhaps images for the regular VMs and rsync for the NAS ). As convenient as it is, cant have a production box down for many hours on a restore that should not take long. ( ya, i know, 4TB isn't going to be quick, but still )



Go to page: First ... 44 45 46 47 [48]