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A9891A — Storage Datasheet

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HP · RAID CONTROLLER
WHAT YOU NEED TO KNOW
Naming: -i=Internal | -e=External | -a=Type-a modular | -c=Mezzanine SR=SmartRAID (cache) | E=Entry (no cache, HBA-like)
Smart Storage Battery SOLD SEPARATELY — no battery = no write-back cache
PRODUCT OVERVIEW

HP Smart Array 6404 U320 4CH Controller. Available through authorized enterprise resellers and TPM (Third Party Maintenance) channels. Verify compatibility with your specific system configuration before ordering.

WHERE IT FITS
A9891A
SPECIFICATIONS
Part NumberA9891A
ManufacturerHP
COMPONENT DIAGRAM
RAID ASIC CACHE FBWC SAS 0 SAS 1 SAS 2 SAS 3 BATT EXT 0 EXT 1 PCIe x8 ~187 mm STORAGE CONTROLLER | RAID 0,1,5,6,10 | PCIe SAS/SATA | FBWC cache | Battery backup connector | TITLE RAID CTRL PN A9891A MFR HP HP Smart Array 6404 U320 4CH Controller
TYPICAL APPLICATIONS
  • Hardware RAID acceleration for enterprise storage
  • Data protection and parity management
  • Cache-backed write acceleration
  • Storage tiering and SSD caching
VERIFIED SUBSTITUTES & CROSS-REFERENCES 2
273914-B21Compatible
HP Smart Array 6404 256Mb 4-Port SCSI Ultra320 PCI-X RAID Controller
compatible
AB363ACompatible
HP Smart Array 6404 256Mb 4-Port SCSI Ultra320 PCI-X RAID Controller for Integrity
compatible
LIFECYCLE
StatusUNKNOWN
Availability—
RoHS CompliantEAR99ESD SensitiveNot HAZMAT
THIS PART SUBSTITUTES FOR 2
AB363ASUBSTITUTE
HP Smart Array 6404 256Mb 4-Port SCSI Ultra320 PCI-X RAID Controller for Integrity
HPE
273914-B21SUBSTITUTE
HP Smart Array 6404 256Mb 4-Port SCSI Ultra320 PCI-X RAID Controller for Integrity
HPE
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FREQUENTLY ASKED QUESTIONS
What is A9891A?
A9891A is a HP Smart Array 6404 U320 4CH Controller manufactured by HP.
What parts can replace A9891A?
There are 2 known substitutes for A9891A: 273914-B21, AB363A. Substitute compatibility should be verified for your specific system.
Is A9891A still available?
A9891A is currently Unknown.
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PartsTable Design LLC · partstable.com
Last verified: August 2026