Re: Differences between disk controllers
Willem Jan Withagen <[email protected]>
| Newsgroups | gmane.os.freebsd.devel.hardware |
|---|---|
| Message-ID | <[email protected]> |
On 11-3-2014 16:34, Pokala, Ravi wrote: > > >> Date: Mon, 10 Mar 2014 22:52:16 +0100 >> From: Willem Jan Withagen <[email protected]> >> To: [email protected] >> Subject: Differences between disk controllers >> Message-ID: <[email protected]> >> Content-Type: text/plain; charset=ISO-8859-1 >> >> Hi, >> >> Running: >> FreeBSD 10.0-STABLE #0 r262730 >> >> I've build a ZFS system, with 4 disks on a regular Marvell controller, >> and 4 disks on an Areca controller. Disk are 4T WD REDs. >> >> I noticed that there were some discrepancies when I build a raidz of 4 >> "marvell" disks when compared to a raidz on the Areca controller. >> >> The essential difference is that on the basic controller the disks are >> recognised as being 4K disks with quirks. On the Areca controller there >> is no quirk that matches... >> >> Is this a typical problem on the Areca controller? Or does this not work? > > The Marvell controller is recognized as a SATA controller, so the drives > attached to it are treated as SATA drives, using the ATACAM stack: > > ada0: <WDC WD40EFRX-68WT0N0 80.00A80> ATA-9 SATA 3.x device > > > The drive in question is listed along with the SATA quirks: > > > sys/cam/ata/ata_da.c :: ada_quirk_table[] > { > /* WDC Caviar Green Advanced Format (4k) drives */ > { T_DIRECT, SIP_MEDIA_FIXED, "*", "WDC WD????RX*", "*" }, > /*quirks*/ADA_Q_4K > }, > > > The Areca controller appears to be acting as a *SAS* controller, so the > drives attached to it are treated as SAS drives, using the SCSICAM stack: > > da0: <WDC WD40EFRX-68WT0N0 R001> Fixed Direct Access SCSI-5 device > > While the SCSICAM stack knows about quirks for SCSI/SAS drives, it doesn't > know anything about quirks for SATA drives. > > There may be an argument there to create a unified quirk list, but that's > a larger discussion. That is probably is correct summation of my question... I more or less expected things not to be different in such extend. --WjW _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hardware To unsubscribe, send any mail to "[email protected]"