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Atomic Writes and PLP

Atomic Writes and PLP

Posted Mar 3, 2026 12:01 UTC (Tue) by RazeLighter777 (subscriber, #130021)
Parent article: The ongoing quest for atomic buffered writes

How do atomic write implementations differ with drives having Power Loss Prevention and those without? It seems like to me that doing atomic operations on drives with PLP and without PLP should be different.

I'm curious about this. I've picked up a couple SAS SSDs with PLP and they've been much more dependable for my database workloads than my consumer grade drives.

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Atomic Writes and PLP

Posted May 15, 2026 4:10 UTC (Fri) by ghodgkins (subscriber, #157257) [Link]

AFAICT, PLP only protects the data in the volatile caches on the SSD itself, behind the interface it presents to the rest of the system. So it would not affect how the kernel manages its in-memory copy of the data.


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