Re: BLKFLSBUF failed???

From: P.T. Breuer (ptb_at_oboe.it.uc3m.es)
Date: 07/22/04 

Date: Thu, 22 Jul 2004 10:25:25 +0200

Shabam <blislecp@hotmail.com> wrote:
> I'm getting a "BLKFLSBUF failed" error when running hdparm on one of my
> machines. What is causing this and how do I fix it?

Lack of support for that ioctl is "causing" it (horrible choice of word
- very aggravating). You "fix" it by adding support for that ioctl call
to the driver of your block device controller, which appears to be a
scsi something.

> Also, is the following consistent with a U320 scsi drive?

What's U320? A rock band?

> [root@localhost root]# hdparm -tT /dev/sda2
>
> /dev/sda2:
> Timing buffer-cache reads: 2680 MB in 2.00 seconds = 1340.87 MB/sec

Meaningless, though impressive. Yes, you have fast ram. I wonder what
the blocksiae was.

> BLKFLSBUF failed: Inappropriate ioctl for device
> Timing buffered disk reads: 292 MB in 3.04 seconds = 95.97 MB/sec

Well, that's more believeable for a real hard disk. Impressive. I
don't think I have any disks that measure at more than 10MB/s. But why
are you asking about U230? This is measuring cpu to disk performance,
not controller bandwidth! Look in your controller bios to see how its
set, or look in the scsi entries in /proc.

Anyway, these kind of measures are pretty meaningless out of a working
context.

> BLKFLSBUF failed: Inappropriate ioctl for device
> [root@localhost root]# hdparm -tT /dev/sda2

Peyer

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