Date: Mon, 14 Aug 2017 00:55:20 -0400 From: "Mikhail T." <mi+thun@aldan.algebra.com> To: freebsd-hardware@FreeBSD.org Subject: ada vs. da? Message-ID: <2c0b1d32-bc9b-26e7-4c51-46bc6a2af40d@aldan.algebra.com>
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The four AHCI-drives in my system appear as both adaX and daX each:
<ST3000DM001-1CH166 CC43> at scbus2 target 0 lun 0 (ada1,pass2)
<ST3000DM001-1CH166 CC43> at scbus3 target 0 lun 0 (ada2,pass3)
<ST3000DM001-1CH166 CC43> at scbus5 target 0 lun 0 (ada3,pass4)
<ST3000DM001-1CH166 CC43> at scbus6 target 0 lun 0 (ada4,pass5)
<Generic STORAGE DEVICE 0550> at scbus7 target 0 lun 0 (da0,pass6)
<Generic STORAGE DEVICE 0550> at scbus7 target 0 lun 1 (da1,pass7)
<Generic STORAGE DEVICE 0550> at scbus7 target 0 lun 2 (da2,pass8)
<Generic STORAGE DEVICE 0550> at scbus7 target 0 lun 3 (da3,pass9)
Each one is listed in /var/run/dmesg.boot like this:
ada2: <ST3000DM001-1CH166 CC43> ATA8-ACS SATA 3.x device
ada2: Serial Number Z1F1E8NK
ada2: 300.000MB/s transfers (SATA 2.x, UDMA6, PIO 8192bytes)
ada2: Command Queueing enabled
ada2: 2861588MB (5860533168 512 byte sectors)
ada2: quirks=0x1<4K>
ada2: Previously was known as ad8
da2: <Generic STORAGE DEVICE 0550> Removable Direct Access SPC-3
SCSI device
da2: Serial Number 000000000195
da2: 40.000MB/s transfers
da2: Attempt to query device size failed: NOT READY, Medium not present
da2: quirks=0x3<NO_SYNC_CACHE,NO_6_BYTE>
What am I supposed to make of it? Can they be accessed through either
name? What are the advantages of each? If ada is always a better choice,
how do I make the da ones disappear -- such as from the systat's output?
Thanks!
-mi
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