On 1/12/2011 9:58 AM, Rick Romero wrote:
Quoting Marc Perkel <m...@perkel.com>:
I just replaced my drives for Dovecot using Maildir format with a
> pair of Solid State Drives (SSD) in a raid 0 configuration. It's
> really really fast. Kind of expensive but it's like getting 20x the
> speed for 20x the price. I think the big gain is in the 0 seek time.
>
> Here's what I bought.
>
> Crucial RealSSD C300 CTFDDAC256MAG-1G1 2.5" 256GB SATA III MLC
> Internal Solid State Drive (SSD)
> <http://www.newegg.com/Product/Product.aspx?Item=N82E16820148349>
>
> * 2.5"
> * 256GB
> * SATA III
>
> * *Sequential Access - Read:* 355MB/sec (SATA 6Gb/s) 265MB/sec
(SATA
> 3Gb/s)
> * *Sequential Access - Write:* 215MB/sec (SATA 6Gb/s) 215MB/sec
> (SATA 3Gb/s)
> * *Power Consumption (Active):* 2.1W READ, 4.3W WRITE
> * *Power Consumption (Idle):* 0.094W
>
> Running it on an Asus motherboard that supports SATA III - 6 core AMD
> CPU and 16 gigs of ram. Might be slightly off topic but this server
> screams!
Hey Marc,
Just for testing purposes, what does a dd speed test give you?
http://it.toolbox.com/blogs/database-soup/testing-disk-speed-the-dd-test-31069
IMHO, the key part is exceeding the RAM size, but for a "closer to
Maildir" comparison, a decent file size that exceeds the drive cache is
good too..
Rick
Looks like a good test. Here's my results.
time sh -c "dd if=/dev/zero of=ddfile bs=8k count=2000000 && sync"
2000000+0 records in
2000000+0 records out
16384000000 bytes (16 GB) copied, 55.403 s, 296 MB/s
real 1m4.738s
user 0m0.336s
sys 0m20.199s
