From owner-freebsd-questions@freebsd.org  Wed Feb  8 14:40:39 2017
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To: freebsd-questions@freebsd.org
From: Alexey Pereklad <technical@at-hacker.in>
Subject: disk detach after "camcontrol identify"
Message-ID: <576c784b-e879-8770-c42f-72e21219f775@at-hacker.in>
Date: Wed, 8 Feb 2017 17:32:02 +0300
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Hi.

Have a couple of disks WD-WXP1E15F0276, connected to LSI 9341-4i. After 
trying to "camcontrol identify <disk_name>" this disk just detaches:


Feb 8 10:11:27 dc1-nfs-06 kernel: da0 at mrsas0 bus 1 scbus1 target 4 lun 0
Feb 8 10:11:27 dc1-nfs-06 kernel: da0: s/n WD-WXP1E15F0276 detached
Feb 8 10:11:27 dc1-nfs-06 kernel: (da0:mrsas0:1:4:0):
Feb 8 10:11:27 dc1-nfs-06 kernel: Periph destroyed
Feb 8 10:11:27 dc1-nfs-06 ZFS: vdev state changed, 
pool_guid=8938099328681394 vdev_guid=17301103442965919776
Feb 8 10:11:27 dc1-nfs-06 ZFS: vdev is removed, 
pool_guid=8938099328681394 vdev_guid=17301103442965919776

After camcontrol rescan detached disk comes back again:

Feb  8 14:02:43 dc1-nfs-06 kernel: (da0:mrsas0:1:4:0): UNMAPPED
Feb  8 14:02:43 dc1-nfs-06 kernel: da0 at mrsas0 bus 1 scbus1 target 4 lun 0
Feb  8 14:02:43 dc1-nfs-06 kernel: da0: <ATA WDC WD7500BFCX-6 0A82> 
Fixed Direct Access SPC-4 SCSI device
Feb  8 14:02:43 dc1-nfs-06 kernel: da0: Serial Number WD-WXP1E15F0276
Feb  8 14:02:43 dc1-nfs-06 kernel: da0: 150.000MB/s transfers
Feb  8 14:02:43 dc1-nfs-06 kernel: da0: 715404MB (1465149168 512 byte 
sectors)


System: FreeBSD 11.0-RELEASE-p1 #1 r312693

I have one more LSI adapter in this server (9341-8i) with 12 disks 
attached (all are WD 2 Tb) and those disks have no problem.