[Linux-cluster] General FC Question

[Roger Peña Escobio]

--- "isplist at logicore.net" <isplist at logicore.net>
wrote:

> Problem is that SCSI devices are changing when I
> add/remove storage devices. 
> For example, a device that was all set up as sda is
> now sdc upon reboot.
> 
yes, I understand you
the same happen when you add LUNs exported from a SAN
the OS will see more devices , and maybe something
that was sda now is sde :-(

with LVM you will not have any problem no matther how
the name of the device change (sda -> sdb or sde)

with GFS alone I guess you will

maybe with the help of multipath or powerpath or any
other "device mapper" tool you can map a device to
something unique and invariable across addiction of
new  real scsi devices or LUNs to the system


cu
roger
> Mike
> 
> 
> On Mon, 25 Sep 2006 18:05:29 -0700 (PDT), Peña
> wrote:
> > 
> > 
> > --- "isplist at logicore.net" <isplist at logicore.net>
> > wrote:
> > 
> >> I'll take a look at that, wwn might work so long
> as
> >> all my storage devices
> >> supports it.
> > but the LUNs that you export from the same SAN
> will
> > show the same wwn, do they?
> > the SAN's wwn I guess
> > 
> > maybe somre kind of LUNs ID can be mapped with
> udev so
> > the same name apply to the same LUNs Id, I am just
> > guessing. Of course, the other way is to use LVM,
> LVM
> > can help because it have "IDs" that helps to gruop
> > always the same PV no matter if you add new
> devices
> > :-)
> > 
> > cu
> > roger
> > 
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__________________________________________
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Cisco Certified Network Associate ( CCNA )

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