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Is the Samsung 840 EVO Sufficient for Running Virtual Machines?

post #1 of 6
Thread Starter 
My main concern is write endurance. I don't want to spend the extra cash on an 840 Pro if I don't have to.
post #2 of 6
How many VMs?
Its(one VM) going to write as much as a normal OS would.
I would go for raided drives, reliability and such, are the machines in a mission critical enviroment?
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post #3 of 6
Quote:
Originally Posted by Rotten Apple View Post

My main concern is write endurance. I don't want to spend the extra cash on an 840 Pro if I don't have to.

Unless you've got databases writing to the disk all the time on your VMs, I wouldn't really worry about it. I do, however, recommend skipping the 120GB model.

I reckon during normal operation, you'd have around 5-10GB writes per day (less if you've got lots of RAM allotted). At 3x write amplification (which is pretty high), that's 5-10TB a year per VM. Even looking at worst case scenario, the 120GB model should be capable of 120TB worth of writes so that's at least 4 VMs for 3 years or 12 VMs for 1 year. With the 250+GB capacities, write endurance is high enough that it's unlikely to be a concern for low-load VMs.
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by jakethesnake438 View Post

How many VMs?
Its(one VM) going to write as much as a normal OS would.
I would go for raided drives, reliability and such, are the machines in a mission critical enviroment?

No, the VMs will only be linux distros for personal use and tinkering.
post #5 of 6
Thread Starter 
Quote:
Originally Posted by rui-no-onna View Post

Unless you've got databases writing to the disk all the time on your VMs, I wouldn't really worry about it. I do, however, recommend skipping the 120GB model.

I reckon during normal operation, you'd have around 5-10GB writes per day (less if you've got lots of RAM allotted). At 3x write amplification (which is pretty high), that's 5-10TB a year per VM. Even looking at worst case scenario, the 120GB model should be capable of 120TB worth of writes so that's at least 4 VMs for 3 years or 12 VMs for 1 year. With the 250+GB capacities, write endurance is high enough that it's unlikely to be a concern for low-load VMs.

I was planning on getting a 250 GB model and I have 16 gigs of DDR3.

Is there any way to activate TRIM in a VM?
Edited by Rotten Apple - 9/12/13 at 9:36am
post #6 of 6
Quote:
Originally Posted by Rotten Apple View Post

I was planning on getting a 250 GB model and I have 16 gigs of DDR3.

Is there any way to activate TRIM in a VM?

The 250GB SSD and 16GB RAM should be fine. As for TRIM, I'm not sure. To be safe, you might want to overprovision if you're going to fill up the drive. I use dynamic disks so I normally trigger TRIM whenever I do maintenance and backup on the virtual disks. That's basically a defrag, zero-out free space then compact. Then again, since these are dynamic disks, it only uses up as much space as the data it holds. Given how fast access times are on SSDs, I doubt fragmentation is going to be much of an issue and I don't think there's going to be much of a performance difference between static and dynamic disks.
Edited by rui-no-onna - 9/12/13 at 10:07am
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