Questions about gmirror

[Ravi Pokala]

> From: Ivan Voras <ivoras at freebsd.org>
> Date: Wed, 19 Dec 2007 20:30:37 +0100
> To: <freebsd-hardware at freebsd.org>
> Conversation: Questions about gmirror
> Subject: Re: Questions about gmirror
> 
> Ravi Pokala wrote:
>> (1) What is the procedure for swapping out a dead drive while the system is
>> online?
> 
> If the drive and the controller support hot swapping, remove it, put a
> new drive in and do:
> 
> # atacontrol reinit channel
> # gmirror forget gm0
> # gmirror insert gm0 /dev/newdrive
> 
> Not many ATA drive+controller combinations are hot-swap-able.
> 
>> (2) Say a drive dies as a result of a power event, and does not respond to
>> probing during the subsequent boot. Once I swap out the drive, (how) can I
>> get the system to re-probe, recognize the new drive, and start
>> reconstruction?
> 
> Exactly the same as above.
> 

I tried that scenario, and it didn't work, which is why I asked. Now, in light of your comment about the controller, I'm looking at dmseg.boot and I see something kind of odd:


atapci0: <ServerWorks HT1000 SATA150 controller> port 0xbc00-0xbc07,0xb880-0xb883,0xb800-0xb807,0xb480-0xb483,0xb400-0xb40f mem 0xfcafe000-0xfcafffff irq 11 at device 14.0 on pci1
ata2: <ATA channel 0> on atapci0
ata3: <ATA channel 1> on atapci0
atapci1: <ServerWorks HT1000 SATA150 controller> port 0xb080-0xb087,0xb000-0xb003,0xac00-0xac07,0xa880-0xa883,0xa800-0xa80f irq 11 at device 14.1 on pci1
ata4: <ATA channel 0> on atapci1
ata5: <ATA channel 1> on atapci1
atapci2: <ServerWorks HT1000 UDMA100 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xffa0-0xffaf at device 2.1 on pci0
ata0: <ATA channel 0> on atapci2
ata1: <ATA channel 1> on atapci2
...
acd0: CDROM <CD-224E-N/1.AA> at ata0-master UDMA33
ad4: DMA limited to UDMA33, device found non-ATA66 cable
ad4: 476940MB <Maxtor 7H500F0 HA431DD0> at ata2-master UDMA33
ad6: DMA limited to UDMA33, device found non-ATA66 cable
ad6: 476940MB <Maxtor 7H500F0 HA431DN0> at ata3-master UDMA33


Note the warning about "non-ATA66 cable"...

On another machine (for which I have not tried the test, but will after New Year's), using a different controller:


atapci0: <Intel ICH6 UDMA100 controller> port 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0xf000-0xf00f at device 31.1 on pci0
ata0: <ATA channel 0> on atapci0
ata1: <ATA channel 1> on atapci0
atapci1: <Intel ICH6 SATA150 controller> port 0xe900-0xe907,0xea00-0xea03,0xeb00-0xeb07,0xec00-0xec03,0xed00-0xed0f mem 0xd05c3000-0xd05c33ff irq 19 at device 31.2 on pci0
ata2: <ATA channel 0> on atapci1
ata3: <ATA channel 1> on atapci1
acd0: CDROM <CD-224E-N/1.AA> at ata0-master UDMA33
ad4: 76319MB <WDC WD800JD-55MUA1 10.01E01> at ata2-master SATA150


That one recognizes the drive as being SATA, so hopefully it will work better. If it turns out the controller on the first machine can't handle hot-swapping then that's unfortunate, since we bought a few of them. :-/ But on the bright side, we also have a few of the latter as well.

Thanks Ivan!

--rp