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ssd/drive questions

looseliam

looseliam

aww I wanted to explode
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I'm building a new file/proxy/dns/et al. server.

I'm thinking about throwing the OS on a pair 20GB SLC SSD (mirrored.) I'm wondering if it's worth the hassle of moving frequently-written directories to another pair or drives for the performance gain. Plus, if for some reason, the main storage pool goes offline, I don't have to worry about OS function being compromised. I'm thinking of just a pair of regular drives.

I'm already planning on off-loading the ZIL and L2ARC onto separate SSDs so most of the fs overhead for the main storage pool is taken care of. And with 64GB of RAM I don't foresee any swapping going on.

I really don't care about boot time as it'll be rarely, if ever, rebooted. Plus, solaris has a new 'fastreboot' feature that reboots the OS without going through POST :gogirl: which is brilliant with three different controllers all loading their own BIOS.

So, in this instance, is a SSD worth it for the OS drive?

I feel like a n00b #-o Please don't /slap me.

TIA
 
I actually understood most of that... I've nothing to offer that would influence your decisions though.
 
the question is .. how much disk access will there be? will it really influence speed?

slap some ram into that thing .. and you probably won't need much disk time. you said it's also a file server. is your network faster than the random disk read speed?

imho the only big argument for ssd drives would be a huge database that won't fit into ram and is read frequently.
 
In testing, there's little access to the root pool outside of log writes and such.

With the output of the storage pool, the network is the bottleneck. As for more RAM, the board won't hold any more. The supermicro board I originally wanted to use would have held 128GB, but it was bigger than standard EATX boards and wouldn't fit in anything but a supermicro box and I didn't want any of the ones they sell.

I could pick-up another small SLC SSD for $100. I just refuse to spend 500+ for 100GB or so and I don't trust MLC drives just yet. Though, as costly as the RAM was, $500 isn't that much.

Thanks for your input.
 
So .. if the network is the bottleneck and there is no disk-based data being processed on the server - invest that money into something else :)
 
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