Using GTP and glabel for ZFS arrays

[Jeremy Chadwick]

On Sat, Jul 24, 2010 at 12:12:54PM -0400, Dan Langille wrote:
> On 7/22/2010 4:11 AM, Dan Langille wrote:
> >On 7/22/2010 4:03 AM, Charles Sprickman wrote:
> >>On Thu, 22 Jul 2010, Dan Langille wrote:
> >>
> >>>On 7/22/2010 3:30 AM, Charles Sprickman wrote:
> >>>>On Thu, 22 Jul 2010, Dan Langille wrote:
> >>>>
> >>>>>On 7/22/2010 2:59 AM, Andrey V. Elsukov wrote:
> >>>>>>On 22.07.2010 10:32, Dan Langille wrote:
> >>>>>>>I'm not sure of the criteria, but this is what I'm running:
> >>>>>>>
> >>>>>>>atapci0:<SiI 3124 SATA300 controller> port 0xdc00-0xdc0f mem
> >>>>>>>0xfbeffc00-0xfbeffc7f,0xfbef0000-0xfbef7fff irq 17 at device 4.0 on
> >>>>>>>pci7
> >>>>>>>
> >>>>>>>atapci1:<SiI 3124 SATA300 controller> port 0xac00-0xac0f mem
> >>>>>>>0xfbbffc00-0xfbbffc7f,0xfbbf0000-0xfbbf7fff irq 19 at device 4.0 on
> >>>>>>>pci3
> >>>>>>>
> >>>>>>>I added ahci_load="YES" to loader.conf and rebooted. Now I see:
> >>>>>>
> >>>>>>You can add siis_load="YES" to loader.conf for SiI 3124.
> >>>>>
> >>>>>Ahh, thank you.
> >>>>>
> >>>>>I'm afraid to do that now, before I label my ZFS drives for fear that
> >>>>>the ZFS array will be messed up. But I do plan to do that for the
> >>>>>system after my plan is implemented. Thank you. :)
> >>>>
> >>>>You may even get hotplug support if you're lucky. :)
> >>>>
> >>>>I just built a box and gave it a spin with the "old" ata stuff and then
> >>>>with the "new" (AHCI) stuff. It does perform a bit better and my BIOS
> >>>>claims it supports hotplug with ahci enabled as well... Still have to
> >>>>test that.
> >>>
> >>>Well, I don't have anything to support hotplug. All my stuff is
> >>>internal.
> >>>
> >>>http://sphotos.ak.fbcdn.net/hphotos-ak-ash1/hs430.ash1/23778_106837706002537_100000289239443_171753_3508473_n.jpg
> >>>
> >>>
> >>
> >>The frankenbox I'm testing on is a retrofitted 1U (it had a scsi
> >>backplane, now has none).
> >>
> >>I am not certain, but I think with 8.1 (which it's running) and all the
> >>cam integration stuff, hotplug is possible. Is a special backplane
> >>required? I seriously don't know... I'm going to give it a shot though.
> >>
> >>Oh, you also might get NCQ. Try:
> >>
> >>[root at h21 /tmp]# camcontrol tags ada0
> >>(pass0:ahcich0:0:0:0): device openings: 32
> >
> ># camcontrol tags ada0
> >(pass0:siisch2:0:0:0): device openings: 31
> >
> >resending with this:
> >
> >ada{0..4} give the above.
> >
> ># camcontrol tags ada5
> >(pass5:ahcich0:0:0:0): device openings: 32
> >
> >That's part of the gmirror array for the OS, along with ad6 which has
> >similar output.
> >
> >And again with this output from one of the ZFS drives:
> >
> ># camcontrol identify ada0
> >pass0: <Hitachi HDS722020ALA330 JKAOA28A> ATA-8 SATA 2.x device
> >pass0: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
> >
> >protocol ATA/ATAPI-8 SATA 2.x
> >device model Hitachi HDS722020ALA330
> >firmware revision JKAOA28A
> >serial number JK1130YAH531ST
> >WWN 5000cca221d068d5
> >cylinders 16383
> >heads 16
> >sectors/track 63
> >sector size logical 512, physical 512, offset 0
> >LBA supported 268435455 sectors
> >LBA48 supported 3907029168 sectors
> >PIO supported PIO4
> >DMA supported WDMA2 UDMA6
> >media RPM 7200
> >
> >Feature Support Enable Value Vendor
> >read ahead yes yes
> >write cache yes yes
> >flush cache yes yes
> >overlap no
> >Tagged Command Queuing (TCQ) no no
> >Native Command Queuing (NCQ) yes 32 tags
> >SMART yes yes
> >microcode download yes yes
> >security yes no
> >power management yes yes
> >advanced power management yes no 0/0x00
> >automatic acoustic management yes no 254/0xFE 128/0x80
> >media status notification no no
> >power-up in Standby yes no
> >write-read-verify no no 0/0x0
> >unload no no
> >free-fall no no
> >data set management (TRIM) no
> 
> Does this support NCQ?

Does *what* support NCQ?  The output above, despite having lost its
whitespace formatting, indicates the drive does support NCQ and due to
using CAM (via ahci.ko or siis.ko) has NCQ in use:

> >Native Command Queuing (NCQ) yes 32 tags

A binary verification (does it/does it not) is also visible in your
kernel log, ex:

ada2: Command Queueing enabled

-- 
| Jeremy Chadwick                                   jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |