New article about software RAID and PM

[Eduardo Berrocal]

Hope you find it useful and interesting: https://software.intel.com/content/www/us/en/develop/articles/storage-redundancy-with-intel-optane-persistent-memory-modules.html

Cheers,
E

[Anton Gavriliuk]

Hi all

Please keep in mind, that in the section

Appendix C: Volume Configuration

They using fsdax (not sector) mode.  So Db/App working on such setup must be aware of 8kb atomicity.

I'm also going to check what is currently faster mdadm or lvm raid for write intensive workloads.

Anton

[Anton Gavriliuk]

8kb -> 8 byte 

вт, 27 окт. 2020 г. в 10:01, Anton Gavriliuk <antos...@gmail.com>:

[Eduardo Berrocal]

Thanks Anton for pointing that out. I also have a paragraph in the article:

"All workloads in this experiment had DAX enabled. I/O against DAX means that applications that rely on write atomicity at the block/sector level can get their data corrupted by torn blocks/sectors in the event of a crash or power failure (x86 architecture only guarantees to write atomically 8 bytes at a time during memory copies). The lack of block write atomicity doesn’t affect the file system’s metadata (the file system takes care of that). For a more extended discussion about this topic, and to see some performance numbers, please read my previous article Speeding Up I/O Workloads with Intel® Optane™ Persistent Memory Modules."