Need advice on building a system with a Raid drive

2005-07-13 Thread Jim Freeze 
Hi

I am building a new system and plan to use two 
300GB drives in a raid 1 configuration. However,
I have read where fbsd can't boot from a raid
drive, but it is not clear why.

Can anyone confirm if this is a valid restriction?
Will I really need a boot drive separate from my
raid drives?

Thanks
-- 
Jim Freeze
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Re: Need advice on building a system with a Raid drive

2005-07-13 Thread Bob Bomar 
On Wed, Jul 13, 2005 at 10:23:13AM -0500, Jim Freeze wrote:
 Hi
 
 I am building a new system and plan to use two 
 300GB drives in a raid 1 configuration. However,
 I have read where fbsd can't boot from a raid
 drive, but it is not clear why.
 
 Can anyone confirm if this is a valid restriction?
 Will I really need a boot drive separate from my
 raid drives?
 

I have 3 machines that boot from RAID 1 just fine, 1 uses
a Promise RAID Card, FastTrak 100 with 2 Hot Swap Enclosures, 
and the other 2 use the promise raid on the motherboards, one
is a MSI, other is Gigabyte.

I like the promise cards, as atacontrol(8) works great
with them.

dmesg from my server:

Drives:
ad4: DMA limited to UDMA33, non-ATA66 cable or device
ad6: DMA limited to UDMA33, non-ATA66 cable or device
ar0: 113487MB ATA RAID1 array [14467/255/63] status: READY subdisks:
 0 READY ad4: 114440MB WDC WD1200JB-75CRA0 [232514/16/63] at ata2-master UDMA3
3
 ad4: SuperSwap enclosure [FAN:3879rpm TEMP:29.0C 5.103V 12.383V]
 1 READY ad6: 114440MB WDC WD1200JB-75CRA0 [232514/16/63] at ata3-master UDMA3
3
 ad6: SuperSwap enclosure [FAN:4166rpm TEMP:28.0C 5.049V 12.261V]
ar1: 76293MB ATA RAID1 array [9726/255/63] status: READY subdisks:
 0 READY ad8: 76319MB WDC WD800JB-00CRA1 [155061/16/63] at ata4-master UDMA100
  1 READY ad10: 76319MB WDC WD800JB-00CRA1 [155061/16/63] at ata5-mast
er UDMA100
 Waiting 2 seconds for SCSI devices to settle
Mounting root from ufs:/dev/ar0s1a
da0 at isp0 bus 0 target 2 lun 0
da0: IBM DCAS-34330W S60B Fixed Direct Access SCSI-2 device 
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit)
da0: 4134MB (8467200 512 byte sectors: 255H 63S/T 527C

Cards:
[EMAIL PROTECTED]:12:0:  class=0x010485 card=0x1275105a chip=0x5275105a 
rev=0x01 hdr=0x00
vendor   = 'Promise Technology Inc'
device   = 'PDC20276 Ultra133 TX2/FastTrak TX Lite EIDE Controller'
class= mass storage
subclass = RAID

[EMAIL PROTECTED]:6:0:   class=0x010485 card=0x4d68105a chip=0x6268105a 
rev=0x02 hdr=0x00
vendor   = 'Promise Technology Inc'
device   = 'PDC20268R FastTrak100 TX2/TX4/LP EIDE controller'
class= mass storage
subclass = RAID


-- 
Bob Bomar
[EMAIL PROTECTED]
-
FreeBSD: The Power to Serve
http://www.freebsd.org



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Re: Need advice on building a system with a Raid drive

2005-07-13 Thread lars 

Bob Bomar wrote:

On Wed, Jul 13, 2005 at 10:23:13AM -0500, Jim Freeze wrote:


Hi

I am building a new system and plan to use two 
300GB drives in a raid 1 configuration. However,

I have read where fbsd can't boot from a raid
drive, but it is not clear why.

Can anyone confirm if this is a valid restriction?
Will I really need a boot drive separate from my
raid drives?


No, see google, it would give you, among other hits:
http://people.freebsd.org/~rse/mirror/

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Re: Need advice on building a system with a Raid drive

2005-07-13 Thread Olivier Nicole 
 I am building a new system and plan to use two 
 300GB drives in a raid 1 configuration. However,
 I have read where fbsd can't boot from a raid
 drive, but it is not clear why.

Is that hardware raid or software raid?

Hardware RAID there is no restriction as FreeBSD will see your RAID
set as one single big disk.

Software RAID, I think it is feasible (I remember reading something
about that) with some tricks (at boot time the boot disk should be
seen un RAIDed until the RAID software is activated or something like
that).

Olivier
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