raid or not raid

[kalin mintchev]

> On Thu, May 24, 2007 at 06:30:06AM -0400, kalin mintchev wrote:
>>
>> so nobody on this list knows anything about raid?
>> wrong list?
>>
>> > hi all..
>> >
>> > i have a box in a remote hosting facility that claims that the machine
>> has
>> > two discs raided in it but df and fstab show only one disc with a
>> bunch of
>> > slices.
>> > under devices there is another name - ad6 - but it's not mounted
>> anywhere.
>> > the one i see both in df and the fstab is ad4 with one big slice and
>> > different partitions....
>
> My (VIA Tech V-RAID) raid disk shows up as ar0, although the ad4 and ad6
> device nodes exist as well.
>
> Do you have the ataraid device in the kernel?

yes. but isn;t that in by default in 5.4 GENERIC?!

>> > they insist there are 2 raided discs in tha machine. the os is 5.4 and
>> i
>> > think at that point the raid drivers were still considered
>> > 'experimental'.
>
> Then ask them how it's done.
>
>> > it makes sense to me that if i don't see a second drive in the fstab
>> there
>> > isn;t any mounting which means that there is no raid going on...
>
> If you're seeing an ad device, it's not RAID-ed, AFAIK.
>
>> > is there any other way i can make sure if raid is actually on?
>> > would there will be any logs somewhere?
>> > the machine has been up for about 2 years and the dmesg is long
>> gone...
>
> It should be in /var/run/dmesg.boot.

thanks. i guess that solves the ad6 mistery:

atapci0: <Intel ICH5 UDMA100 controller> port
0xfc00-0xfc0f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0
ata0: channel #0 on atapci0
ata1: channel #1 on atapci0
atapci1: <Intel ICH5 SATA150 controller> port
0xcc80-0xcc8f,0xcc98-0xcc9b,0xcca0-0xcca7,0xccb0-0xccb3,0xccb8-0xccbf irq
18 at device 31.2 on pci0
ata2: channel #0 on atapci1
ata3: channel #1 on atapci1
.....................................................
ad4: 152587MB <WDC WD1600JS-75MHB0/03.01C03> [310019/16/63] at ata2-master
SATA150
ad6: 152587MB <WDC WD1600JS-75MHB0/03.01C03> [310019/16/63] at ata3-master
SATA150
Mounting root from ufs:/dev/ad4s1a

unless "at device 31.2 on pci0" points to some RAID evidence - which i
think it's false - than i read this as the ad6 disk sits there unused.
am i right?!

according to pciconf the atapci0 and atapci1 are differnt conrollers -
EIDE and SATA so they can both be on pci0 as 31.1 and 31.2?! still no RAID
though...

thanks again...

>
> Roland
> --
> R.F.Smith                                   http://www.xs4all.nl/~rsmith/
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