#StackBounty: #hard-drive #ssd #sata #optical Load average is high while drive is working at SATA 2

Bounty: 50

My laptop was working fine and its load average was between 0.2 – 0.5 (and around 0.02 while doing nothing) until I decide to upgrade it with an SSD.

First I replaced my HDD with SSD, moving HDD into a HDD Caddy, removing the optical disk and putting HDD there instead.

  • Both my SSD and HDD are capable of working with SATA III interfaces.
  • However my HDD is working at SATA 2 mode:
    sudo smartctl -a /dev/sdb | grep SATA
    SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 3.0 Gb/s)
  • Seems my optical drive interface is SATA 2. However I’m not sure about it (First line: 32 slots 6 ports 6 Gbps):
    $ dmesg | grep SATA
    [    6.785571] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 6 ports 6 Gbps 0x5 impl SATA mode
    [    7.161172] ata1: SATA max UDMA/133 abar m2048@0xf261c000 port 0xf261c100 irq 26
    [    7.212366] ata3: SATA max UDMA/133 abar m2048@0xf261c000 port 0xf261c200 irq 26
    [    7.627191] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
    [    7.627209] ata3: SATA link up 3.0 Gbps (SStatus 113 SControl 300)


I booted up the system using my old Ubuntu living on HDD, everything went fine except that load average while doing nothing is around 1.5 – 2 and while system is just booted up is around 4.

What did I done?

  • I installed Ubuntu on SSD and booted up the system using that, same issue, LAvg is around 1.2 – 1.7 while doing nothing.
  • I changed SSD and HDD with each other, same issue.
  • I removed HDD and put SSD at optical disk places, same issue.

What else?

  • If I only use one disk at the main hard drive place load average is normal.
  • If I even use one disk at the optical disk place, I get high load average even if I don’t use it.

So how can I diagnose the problem?

Get this bounty!!!

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