Quad Xeon Processor server slow

tomc

Member
Mar 10, 2010
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Hi
I just picked up a refurbished DELL RACK MOUNT POWEREDGE R820 4 X XEON - E5-4607 2200 192GB Ram.
Latest Proxmox installed and updated. (5.4)
8 x 3TB 2.5" HDD Raid Z2 zfs.GUI shows total 48 cores.
Doing some testing, installed Windows 10 pro and Windows 7 Pro.
Both are running like "dogs".
To make them usable I have had to run each with 16 cores and 36GB ram.
To restore a 90GB backup (200GB VM), it took 133 minutes
On a dell R710 Dual processor same restore takes 26 min.
Any suggestions ???
 

dcsapak

Proxmox Staff Member
Staff member
Feb 1, 2016
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depending on the workload, raidz2 is not very good for io (especially with slow spinners)
i would suggest to instead do raid10 on that, but spinning disks are never very fast
 

tomc

Member
Mar 10, 2010
92
0
6
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Sydney Australia
Hi Dominik
Thanks for the prompt reply,
The dell R710, has same drives and and also same raid config.
Yet it is 5 times faster than the R820

Tom
 

alexskysilk

Active Member
Oct 16, 2015
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Chatsworth, CA
www.skysilk.com
The Dell poweredge R820 is a Sandy bridge generation product. This generation of processors only have 2 QPI transports which means that in a 4 socket arrangement SOME chip-to-chip IO will have to go through two hops. When this happens the cost in latency is atrocious, and to get good i/o out of these systems you have to be VERY deliberate in your NUMA allocations, AND be very cognizant which slot controls your disk interfaces (PCI slots are pinned to a specific cpu socket.)

This may be an instructive experiment for you- remove two cpu's out. you'll need to remove/reposition the memory associated with them, and possibly have to move cards- and see what it does to your performance :)
 

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