Hi,




we have a HGST4u60 SATA JBOD with 24 x 10TB disks. I just saw that back then 
when we created the pool we only cared about disk space and so we created a 
raidz2 pool with all 24disks in one vdev. I have the impression that this is 
cool for disk space but is really bad for IO since this only provides the IO of 
a single disk. We only use it for backups and cold CIFS data but I have the 
impression that especially running a single VEEAM backup copy job really maxes 
out the IO. In our case the VEEAM backup copy job reads and writes the data 
from the storage. Now I wonder if it makes sense to restructure the Pool. I 
have to admit that I don't have any other system with a lot of disk space so I 
can't simply mirror the snapshots to another system and recreate the pool from 
scratch.





Would adding two ZIL SSDs improve performance?





Any help is much appreciated.





Best Regards,


Oliver
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