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

[Jake Maul]

Just a guess, but possibly the DRBD syncer speed is too low? I forget
the syntax, but it's in the manual... it can be set in drbd.conf or on
the command line... or maybe you're using a different sync method now
than before (async -> sync)? Those are the first two things that come
to my mind.

Jake

On Wed, Sep 30, 2009 at 7:23 PM, Dam Thanh Tung <tungdt at isds.vn> wrote:
> 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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