Hi, and thanks for your help.
Unfortunately, it doesn't seem like this is the problem. hdparm reports both disks as reading at around 100MB/s, and disabling NCQ doesn't really make any difference:
root@proxmox:~# for d in {a..b}; do hdparm -t /dev/sd$d; done
/dev/sda:
Timing buffered disk...
I recently had some server downtime for my office Proxmox server over Christmas and took the opportunity to upgrade to 4.1 from 3.4, and everything seemed to go alright. However, now everyone's back in the office, i'm noticing a severe slowdown across the whole system.
I set up a Zabbix...
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