RAM requirements

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RAM requirements

Post by coreyriggle » Sun Sep 16, 2012 11:25 pm

I'm curious what the implications are of using less that 1gb of ram per terabyte of a zpool.
I'd like to run an esata port multiplier enclosure off of an older macbook pro that only has 3GB of ram. I was hoping to have a volume of 5-6TB. It's only a file server I don't need it to be fast.

Any Thoughts?

Thanks
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Re: RAM requirements

Post by satadru » Mon Sep 17, 2012 12:44 pm

More memory is always better.

Maybe you want to see if you can upgrade to more memory?

See here to figure out if you can upgrade to more than you thought you could.http://www.everymac.com/systems/by_capability/actual-maximum-ram-capacity-of-macs.html

I've been running zevo with a esata card + sata port multiplier on a late model Mac Book Pro with 4Gb of RAM, but I'm updating to 6Gb just to be safe.
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Re: RAM requirements

Post by si-ghan-bi » Mon Sep 17, 2012 12:46 pm

I had 4 GB ram, the Mac was slow and I updated to 6 GB. Now I installed ZFS that took 2 GB for itself. I want to lower its cache, my iMac cannot handle more than 6 GB.
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Re: RAM requirements

Post by satadru » Mon Sep 17, 2012 12:56 pm

Hmm. I'm not quite sure how to do that, but I've heard that not having enough physical ram dedicated to zfs can lead to more swap behavior and reduced zfs performance. Good luck!
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Re: RAM requirements

Post by Hardcorefs » Mon Sep 24, 2012 8:33 pm

Maybe there is a possibility to actually store the disk buffers On the storage device.
With the correct caching scheme, frequently accessed data could be in memory, with the rest of the required 'ram' storage rolled out to the disk.
Obviously this could not be used for SSD's, but it would handle many situations where the requirement to remove corruption outweighs the need for speed.
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cross reference

Post by grahamperrin » Tue Nov 20, 2012 6:28 pm

Now in the general discussion area: memory usage, kernel_task and zstat
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