Re: Vinum-CCD and 4 large IDE drives

On Monday, 12 March 2001 at 5:29:57 +0100, Harald Schmalzbauer wrote:
>
> Hello all,
>
> I'm having a serious problem with vinum and ccd. I have four 80GB
> drives connected to a supermicro 370DER. I can do a newfs on each
> drive at the same time without any problems, but trying to build a
> stripeset causes the machine to hang horribly.
>
> First I tried vinum with the following conf
>
> drive d1 device /dev/ad0e
> drive d2 device /dev/ad1e
> drive d3 device /dev/ad2e
> drive d4 device /dev/ad3e
>
> volume backup
> plex org striped 256k
> sd length 78159m drive d1
> sd length 78159m drive d2
> sd length 78159m drive d3
> sd length 78159m drive d4
>
> Everything looked ok, made a newfs and mounted /dev/vinum/backup. I wrote a
> 80MB file, ok. I wrote a 800MB file system hangs without any dump.
> Same with fsck. If I fsck /dev/vinum/backup the system hangs.
>
> I decided to take ccd, but it was exactly the same.
>
> Here what dmesg says:
> ad0: 78167MB <Maxtor 98196H8> [158816/16/63] at ata0-master UDMA33
> ad1: 78167MB <Maxtor 98196H8> [158816/16/63] at ata0-slave UDMA33
> ad2: 78167MB <Maxtor 98196H8> [158816/16/63] at ata1-master UDMA33
> ad3: 78167MB <Maxtor 98196H8> [158816/16/63] at ata1-slave UDMA33
>
>
> Fdisk set the geometry to 9964/255/63
>
> What am I doing wrong?

I suspect some hardware problem. But running both masters and slaves
in the same volume is asking for performance problems. Try the
following:

1. Try a volume with only two subdisks, on the primary disks.
2. If that works, try a subtle difference to your previous Vinum
    config:

volume backup
plex org striped 256k
sd length 78159m drive d1
sd length 78159m drive d3
sd length 78159m drive d2
sd length 78159m drive d4

That way you're less likely to run into trouble with concurrent access
to the primary and slave disks on the same controller.

Greg

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