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"Write cache: enabled, read cache: enabled, doesn't support DPO or FUA"

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just dropped in 3 more drives and brought the array online, all is good, parity check ran ok, but looking thru the logs I saw this...

 

Apr 16 13:49:20 BURBANK kernel: scsi 5:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 ML6O PQ: 0 ANSI: 5
Apr 16 13:49:20 BURBANK kernel: sd 5:0:0:0: [sdd] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
Apr 16 13:49:20 BURBANK kernel: scsi 6:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 ML6O PQ: 0 ANSI: 5
Apr 16 13:49:20 BURBANK kernel: sd 5:0:0:0: [sdd] Write Protect is off
Apr 16 13:49:20 BURBANK kernel: scsi 7:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 ML6O PQ: 0 ANSI: 5
Apr 16 13:49:20 BURBANK kernel: sd 5:0:0:0: [sdd] Mode Sense: 00 3a 00 00
Apr 16 13:49:20 BURBANK kernel: scsi 8:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 ML6O PQ: 0 ANSI: 5
Apr 16 13:49:20 BURBANK kernel: sd 5:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Apr 16 13:49:20 BURBANK kernel:  sdd:
Apr 16 13:49:20 BURBANK kernel: sd 7:0:0:0: [sdf] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
Apr 16 13:49:20 BURBANK kernel: sd 6:0:0:0: [sde] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
Apr 16 13:49:20 BURBANK kernel: scsi 9:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 ML6O PQ: 0 ANSI: 5
Apr 16 13:49:20 BURBANK kernel: sd 7:0:0:0: [sdf] Write Protect is off
Apr 16 13:49:20 BURBANK kernel: sd 7:0:0:0: [sdf] Mode Sense: 00 3a 00 00
Apr 16 13:49:20 BURBANK kernel: sd 8:0:0:0: [sdg] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
Apr 16 13:49:20 BURBANK kernel: scsi 10:0:0:0: Direct-Access     ATA      Hitachi HDS5C302 ML6O PQ: 0 ANSI: 5
Apr 16 13:49:20 BURBANK kernel: sd 6:0:0:0: [sde] Write Protect is off
Apr 16 13:49:20 BURBANK kernel: sd 10:0:0:0: [sdi] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
Apr 16 13:49:20 BURBANK kernel: sd 10:0:0:0: [sdi] Write Protect is off
Apr 16 13:49:20 BURBANK kernel: sd 10:0:0:0: [sdi] Mode Sense: 00 3a 00 00
Apr 16 13:49:20 BURBANK kernel: sd 10:0:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Apr 16 13:49:20 BURBANK kernel:  sdi:
Apr 16 13:49:20 BURBANK kernel: sd 9:0:0:0: [sdh] 3907029168 512-byte logical blocks: (2.00 TB/1.81 TiB)
Apr 16 13:49:20 BURBANK kernel: sd 9:0:0:0: [sdh] Write Protect is off
Apr 16 13:49:20 BURBANK kernel: sd 9:0:0:0: [sdh] Mode Sense: 00 3a 00 00
Apr 16 13:49:20 BURBANK kernel: sd 9:0:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Apr 16 13:49:20 BURBANK kernel:  sdh:
Apr 16 13:49:20 BURBANK kernel: sd 6:0:0:0: [sde] Mode Sense: 00 3a 00 00
Apr 16 13:49:20 BURBANK kernel: sd 7:0:0:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Apr 16 13:49:20 BURBANK kernel: sd 8:0:0:0: [sdg] Write Protect is off
Apr 16 13:49:20 BURBANK kernel: sd 8:0:0:0: [sdg] Mode Sense: 00 3a 00 00
Apr 16 13:49:20 BURBANK kernel:  sdf:
Apr 16 13:49:20 BURBANK kernel: sd 8:0:0:0: [sdg] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Apr 16 13:49:20 BURBANK kernel:  sdg:
Apr 16 13:49:20 BURBANK kernel: sd 6:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Apr 16 13:49:20 BURBANK kernel:  sde: sdh1
Apr 16 13:49:20 BURBANK kernel: sd 9:0:0:0: [sdh] Attached SCSI disk
Apr 16 13:49:20 BURBANK kernel:  sdi1
Apr 16 13:49:20 BURBANK kernel: sd 10:0:0:0: [sdi] Attached SCSI disk
Apr 16 13:49:20 BURBANK kernel:  sdd1
Apr 16 13:49:20 BURBANK kernel: sd 5:0:0:0: [sdd] Attached SCSI disk
Apr 16 13:49:20 BURBANK kernel:  sde1
Apr 16 13:49:20 BURBANK kernel: sd 6:0:0:0: [sde] Attached SCSI disk
Apr 16 13:49:20 BURBANK kernel:  sdf1
Apr 16 13:49:20 BURBANK kernel: sd 7:0:0:0: [sdf] Attached SCSI disk
Apr 16 13:49:20 BURBANK kernel:  sdg1
Apr 16 13:49:20 BURBANK kernel: sd 8:0:0:0: [sdg] Attached SCSI disk

 

Everything seems ok but is this an error or a warning or informational?

 

Still on 4.7

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