Setting up new Truenas scale is there a raid 50 equivalent or run RaidZ2?

TrueNAS General
22

Iperf is a network speed test.

Bandwidth of the raidz2 (in theory) should be the same as the 2x raidz1, the raidz1 should have twice the IOPs.

The raidz2 is more resilient.

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23

You have to pick what you want more. More resilient (still doesnā€™t negate backups) Raidz2/z3, faster is multiple vdev mirrors or raidz1, or, much larger (# drives) raidz2. No one can pick your priority for you. Performance is well known, no need to test.

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24

not sure this is the thread but do I now need a separate drive for L2ARC/logs/cacheā€¦never set one up beforeā€¦

i have two available slots for ssdā€™s what is recommended? (not actual drives but drive type)

25

It is recommended to check what L2ARC and SLOG are, and what are their requirements.

SLOG is ONLY for sync writes. If you do run databases or business critical VMs, a SLOG must have low write latency, high endurance and Power-Loss Protection (i.e. Data Centre-grade SSD, not consumer).

L2ARC is only useful if arc_summary shows significant misses with the current configuration. The requirements are at least 64 GB RAM, high endurance and sizing L2ARC appropriately (between 5 to 10 times the RAM, not more).

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26

thanks it is just for personal home use. I have been using my old freenas box for several years with additional drives.

Thanks everyone for all the help.

27

Thanks, @Stux - I assumed OP meant ā€œfile transfer over the networkā€ comparisonā€¦ but ?

28

Which may have been a good assumption, but I assumed the OP wanted to benchmark the difference between different pool layouts and iperf would not do that.

29

Hey guys, i was looking for test to compare the read/write each pool layout. since this was is a test box right i was able to create both pools and test copying large and small files to and fromā€¦ i got the same speed results from both. SO since this a personal project i decided to go with the RAIDZ2 option. just simpler

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