Re: [Iscsitarget-devel] slow writes with iet on drbd (but loopback makes is good again!)

[Arne R. <arn...@go...>]

2011/11/18 Mark van Walraven <ma...@ne...>:
> Hi All,
>
> I have a weird problem since upgrading from Debian Lenny.  I'm running
> IET 1.4.20.2 and DRBD 8.3.7 with configs like:
>
> /usr/sbin/ietadm --op new --tid=7 --lun=0 --params
> Path=/dev/drbd7,Type=blockio,ScsiId=fred
>
> While reading is nice and fast, write speeds are abysmal (kilobytes per
> second!).  However there is a twist: this works as fast as ever it did:

Mark,

Can you try without IET, e.g. by dd'ing to the drbd device with oflag=direct:
dd if=/dev/zero of=/dev/drbd7 oflag=direct bs=4k

arne

> losetup -f /dev/drbd7
> /usr/sbin/ietadm --op new --tid=7 --lun=0 --params
> Path=/dev/loop0,Type=blockio,ScsiId=test
>
> Any ideas?
>
> Thanks,
>
> Mark.
>
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