Hi,
I am running a small server with 8 gigz ram and a cute little Intel Atom and a Samsung 120 Gigz SSD.
Linux niftypika 3.2.0-4-amd64 #1 SMP Debian 3.2.73-2+deb7u2 x86_64 GNU/Linux
Life was good, everything was okay. After 1 week of running this little guy my i/o load got up.
top - 01:49:49 up 9 days, 13:51, 1 user, load average: 8.00, 7.71, 7.45 Tasks: 133 total, 2 running, 131 sleeping, 0 stopped, 0 zombie %Cpu(s): 5.4 us, 3.5 sy, 0.9 ni, 39.0 id,
50.7 wa, 0.0 hi, 0.5 si, 0.0 st KiB Mem: 8186596 total, 6800764 used, 1385832 free, 16528 buffers KiB Swap: 14648316 total, 462764 used, 14185552 free, 3545444 cached
I download a lot of stuff, (normal tcp/ip, no p2p encrypted traffic etc) and things started normal. The server had no issue at all to copy the 5-800 Mbit traffic to disk. Now, every day things get complicated. Every day the i/o load gets worse.
IOTOP showed me what the problem was:
2361 be/4 root 0.00 B/s 0.00 B/s 0.00 %
99.47 % [flush-8:0] 1412 be/3 root 0.00 B/s 107.03 M/s 0.00 %
99.55 % [jbd2/sda4-8]
but it also showed me the system "only" wrote around 70 megz /sec and this is a SSD. (I checked it twice
Total DISK READ: 14.27 K/s | Total DISK WRITE: 65.75 M/s
I googled it and I really got no good answer for this behavior. Perhaps anyone has a clue what is wrong and most importently how I can fix it?
Thanks for reading
niftyhamster