Re: [zfs-discuss] jbod questions

[Randy Bias]

On Sep 30, 2006, at 1:07 PM, Torrey McMahon wrote: What about the case of an iSCSI LUN?  Does this change?  I get that while local to the system a read from a mirror versus a RAIDZ pool is desirable, but would an IP network introduce enough latency that the difference is negligible?  And wouldn't I get better aggregate performance across more spindles for multiple iSCSI LUNs than trying to create a mirror pair for each individual iSCSI LUN?  I hate to say but ... it depends. How fast is the iSCSI connection. There are too many variables in the stack - network, array, backend target, iSCSI stack, etc. - to make a generalization. Hrm... I hate to overload this particular thread with details on this question.  Perhaps I should lob in another e-mail?  I'm essentially intending to build a backend iSCSI target using Solaris x86 w/ZFS on commodity hardware.  Front-end is a heterogenous group of VMware instances running on Linux physical hosts. I'll open up a separate thread, but essentially I'm trying to get scalable performance out of the backend.  It doesn't have to be blazing fast, but it would be great if I could get close to a single spindle of speed for each VM up to say about 10 or even 20 VMs. --Randy

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