RAID

hi ...

i have a simple RAID question(s).

this is from the dmesg of a newly installed bsd7:

ad4: 238475MB <Seagate ST3250310AS 3.AAA> at
ata2-master SATA150
ad6: 238475MB <Seagate ST3250310AS 3.AAA> at
ata3-master SATA150
ar0: 238472MB <Intel MatrixRAID RAID1> status: READY
ar0: disk0 READY (master) using ad4 at ata2-master
ar0: disk1 READY (mirror) using ad6 at ata3-master

from what i understand here is that if at the time of
installation i 
install the system on ar0 that means i'd have RAID1 made out
of ad4 and ad6.
right?
is there any configuration to be done?
how do i know what driver is being used? it says:
hptrr: HPT RocketRAID controller driver v1.1 (Feb 24 2008
19:59:27)
.............................................
hptrr: no controller detected.'


that's it. thanks.




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> hi ...
> 
> i have a simple RAID question(s).
> 
> this is from the dmesg of a newly installed bsd7:
> 
> ad4: 238475MB <Seagate ST3250310AS 3.AAA> at
ata2-master SATA150
> ad6: 238475MB <Seagate ST3250310AS 3.AAA> at
ata3-master SATA150
> ar0: 238472MB <Intel MatrixRAID RAID1> status:
READY
> ar0: disk0 READY (master) using ad4 at ata2-master
> ar0: disk1 READY (mirror) using ad6 at ata3-master
> 
> from what i understand here is that if at the time of 
> installation i install the system on ar0 that means i'd
have 
> RAID1 made out of ad4 and ad6.
> right?
> is there any configuration to be done?
> how do i know what driver is being used? it says:
> hptrr: HPT RocketRAID controller driver v1.1 (Feb 24
2008 
> 19:59:27)
.............................................
> hptrr: no controller detected.'
> 
> 
> that's it. thanks.
> 
> 
> 
> 

It is saying "ar0: 238472MB <Intel MatrixRAID
RAID1> status: READY"

So assume it is onboard Intel RAID. When configuring FBSD
setup, just make sure you're selecting the ar0 controller
and partition it as you like. That is it!

Tamouh


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thanks....
i did install the system now on ar0. the dmesg output below
didn't 
change. the df does show only one drive - ar0 - with a few
slices...
assuming now that i have RAID1 working is there any way to
monitor disks 
individually? or as an array?
how can i be sure that the RAID is actually working? or get
any stats?
i figured the driver for the <Intel MatrixRAID RAID1>
must be iir. bit 
from the iir man page ther is not much about monitoring or
status...

thanks...


Tamouh H. wrote:
>> hi ...
>>
>> i have a simple RAID question(s).
>>
>> this is from the dmesg of a newly installed bsd7:
>>
>> ad4: 238475MB <Seagate ST3250310AS 3.AAA> at
ata2-master SATA150
>> ad6: 238475MB <Seagate ST3250310AS 3.AAA> at
ata3-master SATA150
>> ar0: 238472MB <Intel MatrixRAID RAID1>
status: READY
>> ar0: disk0 READY (master) using ad4 at ata2-master
>> ar0: disk1 READY (mirror) using ad6 at ata3-master
>>
>> from what i understand here is that if at the time
of 
>> installation i install the system on ar0 that means
i'd have 
>> RAID1 made out of ad4 and ad6.
>> right?
>> is there any configuration to be done?
>> how do i know what driver is being used? it says:
>> hptrr: HPT RocketRAID controller driver v1.1 (Feb
24 2008 
>> 19:59:27)
.............................................
>> hptrr: no controller detected.'
>>
>>
>> that's it. thanks.
>>
>>
>>
>>
>>     
>
> It is saying "ar0: 238472MB <Intel MatrixRAID
RAID1> status: READY"
>
> So assume it is onboard Intel RAID. When configuring
FBSD setup, just make sure you're selecting the ar0
controller and partition it as you like. That is it!
>
> Tamouh
>
>
> _______________________________________________
> freebsd-questionsfreebsd.org mailing list
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> To unsubscribe, send any mail to
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>   
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In the last episode (Mar 11), kalin m said:
> thanks....
> i did install the system now on ar0. the dmesg output
below didn't change. 
> the df does show only one drive - ar0 - with a few
slices...
> assuming now that i have RAID1 working is there any way
to monitor disks 
> individually? or as an array?
> how can i be sure that the RAID is actually working? or
get any stats?
> i figured the driver for the <Intel MatrixRAID
RAID1> must be iir. bit from 
> the iir man page ther is not much about monitoring or
status...

MatrixRAID is one of those not-really-raid controllers that
only
provides RAID during the boot process, and the OS has to
implement RAID
in software itself.  FreeBSD has an ataraid driver to handle
these
cards.  The atacontrol command lets you view status.  See
the ataraid
and atacontrol manpages for more info.

-- 
	Dan Nelson
	dnelsonallantgroup.com
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thanks....

i read the atacontrol man. there is a part in there that
says:
..............
 A quick and dirty way to create such a mirrored array
(RAID1) on a new 
system is
     to boot off the FreeBSD install CD, do a minimal
scratch install, abort
     out of the post install questions, and at the command
line issue 
the com-
     mand:

           atacontrol create RAID1 ad4 ad6

     then immediately issue a reboot and boot from the
installation CD 
again,
     and during the installation, you will now see
"ar0" listed as a disk to
     install on, and install on that instead of ad4, ad6,
etc.
.............

in my case the machine showed me the ar0 to install the
system on it 
without doing this 'quick and dirty way'.

and now i get:
# atacontrol status ar0
ar0: ATA RAID1 status: READY
 subdisks:
   0 ad4  ONLINE
   1 ad6  ONLINE


that tells me that i actually do have RAID1 active. which
means it's a 
software one, correct?

also if you do not mind please elaborate on "MatrixRAID
is one of those 
not-really-raid controllers that onlyprovides RAID during
the boot 
process..."


thank you...



Dan Nelson wrote:
> In the last episode (Mar 11), kalin m said:
>   
>> thanks....
>> i did install the system now on ar0. the dmesg
output below didn't change. 
>> the df does show only one drive - ar0 - with a few
slices...
>> assuming now that i have RAID1 working is there any
way to monitor disks 
>> individually? or as an array?
>> how can i be sure that the RAID is actually
working? or get any stats?
>> i figured the driver for the <Intel MatrixRAID
RAID1> must be iir. bit from 
>> the iir man page ther is not much about monitoring
or status...
>>     
>
> MatrixRAID is one of those not-really-raid controllers
that only
> provides RAID during the boot process, and the OS has
to implement RAID
> in software itself.  FreeBSD has an ataraid driver to
handle these
> cards.  The atacontrol command lets you view status. 
See the ataraid
> and atacontrol manpages for more info.
>
>   
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In the last episode (Mar 11), kalin m said:
> thanks....
[...] 
> 
> in my case the machine showed me the ar0 to install the
system on it
> without doing this 'quick and dirty way'.
> 
> and now i get:
> # atacontrol status ar0
> ar0: ATA RAID1 status: READY
> subdisks:
>   0 ad4  ONLINE
>   1 ad6  ONLINE
> 
> that tells me that i actually do have RAID1 active.
which means it's a 
> software one, correct?

Right.  The system must have already been set up for RAID
when you
bought it.
 
> also if you do not mind please elaborate on
"MatrixRAID is one of
> those not-really-raid controllers that only provides
RAID during the
> boot process..."

All of the controllers handled by the ataraid device are
BIOS-only raid
controllers.  Once the boot process hands control to an
operating
system, that OS has to manage the RAID itself, making sure
that
mirrored disks are written to, and rebuilding damaged
volumes.  This is
different from hardware RAID, where external hardware
(usually with a
battery-backed RAM cache to add performance) manages all of
that and
the OS just has to read and write blocks to the virtual raid
device.

-- 
	Dan Nelson
	dnelsonallantgroup.com
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