Why do we see ataX: softreset failed (device not ready) messages when hotplugging ATA drives

Solution In Progress - Updated -


  • ATA drive hotplugging logged the below softreset messages:
ata9: softreset failed (device not ready)
ata9: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
ata9.00: ATA-11: WUH721818ALE6L4, PCGAW232, max UDMA/133
ata9.00: 35156656128 sectors, multi 0: LBA48 NCQ (depth 32), AA
ata9.00: configured for UDMA/133
scsi 8:0:0:0: Direct-Access     ATA      WUH721818ALE6L4  W232 PQ: 0 ANSI: 5
sd 8:0:0:0: [sdi] 35156656128 512-byte logical blocks: (18.0 TB/16.4 TiB)
sd 8:0:0:0: [sdi] 4096-byte physical blocks
sd 8:0:0:0: [sdi] Write Protect is off
sd 8:0:0:0: [sdi] Mode Sense: 00 3a 00 00
sd 8:0:0:0: [sdi] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sd 8:0:0:0: Attached scsi generic sg8 type 0
sd 8:0:0:0: [sdi] Attached SCSI removable disk


  • Red Hat Enterprise Linux 8
  • Server with ATA drive hotplug capable slots running RHEL.

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