[Lustre-discuss] drbd slow I/O with lustre filesystem

[Dam Thanh Tung]

Problems followed by problems, sorry if i am about to be a spammer in this
mailing list :)

I'm currently using drbd as a raid 1 network devices solution for my lustre
storage system. It worked well during 3 months but now, when i have to
reformat our devices, re-synchronize drbd devices ( it took about 2 days
with 6TB raid-5 partition ). After formatting them with lustre format (
using mkfs.lustre ) , i start to copy data to my drbd devices, but:

- Its I/O wait when i monitor by top or iostat is too hight, about 25%

- The copy speed from my web client to our OST using drbd devices is too
low, only about 13MB/s although client and ost in is the same 1Gb Ethernet
LAN.


When i tried using one OST without drbd, it worked quite well

So, could any one please tell me where the problem is ? In our drbd devices
or because of lustre ? Is there anyone has the same problem with me ? :(
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