I have some questions about the choice of SSDs to use for ZIL and L2ARC.
I'm trying to build an OpenSolaris iSCSI SAN out of a whitebox system,
which is intended to be used as a backup SAN during storage migration,
so it's built on a tight budget.
The system currently has 4GB RAM, 3GHz Core2-Quad and 8x 500GB WD REII
SATA HDDs attached to an Areca 8port ARC-1220 controller configured as
RAID10.
For ZIL and rpool I'm planning on ordering 2x 16GB Mtron server grade
SLC SSDs (Pro 7500 Series) and attach them to a 2port Areca ARC-1200
SATA RAID controller with BBU as a mirror.
The reason for using a RAID controller here, is so the battery backup
makes sure the zil is flushed to disk, while the controller cache helps
counter the disabled drive cache.
For the L2ARC I've ordered 4x Intel X25-M G2 80GB SLC SSDs which I plan
to connect to the intel onboard ahci ports.
- Is this a reasonable setup for ZIL?
- Is it safe to run the L2ARC without battery backup with write cache
enabled?
- For the tank, on the 8port Areca, do I need a battery backup on that
controller aswell or will the ZIL suffice to assure correct data?
- Does it make sense to use HW RAID10 on the storage controller or would
I get better performance out of JBOD + ZFS RAIDZ2?
Best Regards,
Felix Buenemann
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