Is it better practice to buy RAID disks individually vs. in bulk?

In practice, people who buy from enterprise vendors (HPE, Dell, etc.) do not worry about this.

Drives sourced by these vendors are already spread across multiple manufacturers under the same part number.

An HP disk under a particular SKU may be HGST or Seagate or Western Digital.

Same HP part number, variation on manufacturer, lot number and firmware
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You shouldn’t try to outsmart/outwit the probability of batch failure, though. You’re welcome to try if it gives peace of mind, but it may not be worth the effort.

Good practices like clustering, replication and solid backups are the real protection for batch failures. Add hot and cold spares. Monitor your systems closely. Take advantage of smart filesystems like ZFS 🙂

And remember, hard drive failures aren’t always mechanical…

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