Anyone who could come with an estimate what would be required in terms of FreeNAS hardware to sustain 1,5 GB/sec over 40gbe network from a FreeNAS server from HDDs for large sequential reads and writes? Still have plenty of memory, and fast SSDs to speed up random access?
I do frequent backups, so data security slightly less important, but speed very important. Quite some size also wanted, so rather parity based than Raid 1 style/derivatives. Around 30 TB needed. And would need to allow for one HDD to die, and still at least get a chance to replace and try to recover (well aware that it may fail).
Reason I ask, is that I use a LSI 9361-8i and a 12gb expander to 11 3 TB 7200 rpm HGST disks now. Get around 1.2 GB sequential reads and writes over 40 gbe network (100 GB data). This is quite ok, but the server perform bad of random access. I tried to fix this by having 6 SSDs in Cachecade, but that significantly hurts sequential transfers to around 800 MB/sec.
One idea I have would be a Dell R720XD, with 12 3.5 inch drives, a 1 TB Samsung 960 as L2ARC, some suitable ZIL drive and 128GB memory. Anyone have some performance estimate for this?
For my big transfers much will be fetched from HDDs, so I could see disks bottle necking. How do the raid 5 FreeNAS equivalent perform over 12 disks compared to a LSI 9361?
And yes, I know my set-up (huge raid 5 for instance) is stupid from many use cases... But have certain wishes, like some small redundancy, high sequential read and write, decent random access performance etc.
I do frequent backups, so data security slightly less important, but speed very important. Quite some size also wanted, so rather parity based than Raid 1 style/derivatives. Around 30 TB needed. And would need to allow for one HDD to die, and still at least get a chance to replace and try to recover (well aware that it may fail).
Reason I ask, is that I use a LSI 9361-8i and a 12gb expander to 11 3 TB 7200 rpm HGST disks now. Get around 1.2 GB sequential reads and writes over 40 gbe network (100 GB data). This is quite ok, but the server perform bad of random access. I tried to fix this by having 6 SSDs in Cachecade, but that significantly hurts sequential transfers to around 800 MB/sec.
One idea I have would be a Dell R720XD, with 12 3.5 inch drives, a 1 TB Samsung 960 as L2ARC, some suitable ZIL drive and 128GB memory. Anyone have some performance estimate for this?
For my big transfers much will be fetched from HDDs, so I could see disks bottle necking. How do the raid 5 FreeNAS equivalent perform over 12 disks compared to a LSI 9361?
And yes, I know my set-up (huge raid 5 for instance) is stupid from many use cases... But have certain wishes, like some small redundancy, high sequential read and write, decent random access performance etc.
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