RES: Is the controller using Write-back or Write-through?

[Carlos H. Reimer]

Reading the following dmesg messages can I assume that the controller is configured as write-through?

...
...
scsi1 : LSI Logic MegaRAID driver
scsi[1]: scanning scsi channel 0 [Phy 0] for non-raid devices
  Vendor: SDR       Model: GEM318P           Rev: 1
  Type:   Processor                          ANSI SCSI revision: 02
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
SCSI device sda: 143114240 512-byte hdwr sectors (73274 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
SCSI device sda: 143114240 512-byte hdwr sectors (73274 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
 sda: sda1 sda2 sda3 sda4 < sda5 >
Attached scsi disk sda at scsi1, channel 1, id 0, lun 0
libata version 1.10 loaded.
...
...

Reimer

> -----Mensagem original-----
> De: Ed.Greshko at greshko.com [mailto:Ed.Greshko at greshko.com]
> Enviada em: quinta-feira, 8 de fevereiro de 2007 23:36
> Para: carlos.reimer at opendb.com.br; For users of Fedora
> Assunto: Re: Is the controller using Write-back or Write-through?
> 
> 
> Carlos H. Reimer wrote:
> > Hi,
> >  
> > How can I discover if my megaraid SCSI controller is configured as 
> > write-back or write-through?
> >  
> > Is there a tag in some system file that shows it or should I use the 
> > BIOS or the controller utility?
> 
> It should be shown in /var/log/dmesg.
> 
> -- 
> Nemo me impune lacessit.
> 	[No one provokes me with impunity]
> 		-- Motto of the Crown of Scotland
> 
>