RES: Disk saturation

[Carlos H. Reimer]

Regarding these weird messages in the dmesg output:

sda: asking for cache data failed
sda: assuming drive cache: write through

Does it mean that scsi controller does not have cache?

And even if there is cache in the controller does message mean that it will
not be used?

Thank you!

Reimer


> -----Mensagem original-----
> De: fedora-list-bounces at redhat.com
> [mailto:fedora-list-bounces at redhat.com]Em nome de Curtis Doty
> Enviada em: quinta-feira, 8 de fevereiro de 2007 21:51
> Para: Fedora
> Assunto: Re: Disk saturation
>
>
> 1:39pm Carlos H. Reimer said:
> >
> > How can I be sure if there is a hardware or software raid
> running over the
> > disks? I think it is hardware because there is no mdadm process
> running, am
> > I right?
>
> Wrong logic. Look at /proc/mdstat to see whether raid is running in the
> kernel. The mdadm is just for userland admnistration and/or monitoring.
>
> > scsi[1]: scanning scsi channel 1 [virtual] for logical drives
> >   Vendor: MegaRAID  Model: LD 0 RAID1   69G  Rev: 351S
> >   Type:   Direct-Access                      ANSI SCSI revision: 02
>
> There's your hardware raid.
>
> ../C
>
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