👤
Home Man
Search
Today's Posts
Register

Discuss NAS, SAN, RAID, Robotic Libraries, backup devices, RAM, DRAM, SCSI, IDE, EIDE topics here.

RAID 0 for SSD

👤 Login to reply

 
Thread Tools Search this Thread
# 1  
Old 03-12-2013
RAID 0 for SSD

Nowadays the fastest SSDs achieve read-speeds of between 1500 MB/s to 1900 MB/s. Let's say that two such SSDs in RAID 0 achieve roughly double the throughput, ie 3000 MB/s. That is only half an order of magnitude removed from RAM ((10)^(1/2) * 3000 = 10.000), very broadly speaking.
So for the price of about a twentieth of that of RAM (comparing dollar figure per GB for both RAM and SSD), I can get something which is performance-wise close to RAM.
Is anyone familiar with such a setup? Is what I have just theorised even correct?
# 2  
Old 03-12-2013
Possible bottlenecks include your RAID controller, your bus, and your northbridge. Don't think you'd get performance even close to theoretical.
# 3  
Old 03-13-2013
Hardware RAID0 is always faster than a single disk because you can step the reads and writes across the two disks simultaneously. However, I have never come across a case where throughput was doubled. Typically you will get something like a 50% increase in throughput.

Software RAID0 can provide throughput improvement but typically less than hardware RAID0.
# 4  
Old 03-14-2013
Thank you for your responses. Would you then recommend RAID 0 with disks of equal read/write speed?
# 5  
Old 03-14-2013
Depends for what purpose. It's hard to speak in generalities.
# 6  
Old 03-14-2013
I was wondering about the situation when having two disks in RAID 0 setup, with one distinctly faster than the other. Would the faster disk be overkill, because the speed gain is not utilised to its full advantage? In other words, would software have to be written to use the faster disk more often?
# 7  
Old 03-14-2013
I don't really see the point of doing so. Performance would be lower and inconsistent. Something smarter than simple mirroring or striping would be needed to get the advantages of both.
👤 Login to reply

« Previous Thread | Next Thread »
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

More UNIX and Linux Forum Topics You Might Find Helpful
Thread Thread Starter Forum Replies Last Post
CentOS 6.6 SSD trim on HP DL380 G2 RAID 0 itik Linux 1 07-12-2015 08:22 PM
What should I format my SSD with? mrm5102 UNIX for Dummies Questions & Answers 3 10-28-2014 06:48 PM
RAID Configuration for IBM Serveraid-7k SCSI RAID Controller @dagio Red Hat 0 04-30-2013 09:11 AM
Software RAID on top of Hardware RAID KhawHL Solaris 4 12-16-2011 01:52 AM
SCSI PCI - X RAID Controller card RAID 5 AIX Disks disappeared filosophizer AIX 0 06-14-2011 02:20 PM
SSD with GPFS ? zxmaus AIX 0 04-05-2011 09:33 PM
RAID software vs hardware RAID presul UNIX for Dummies Questions & Answers 2 07-20-2010 02:09 PM
Using SSD in FreeBSD figaro BSD 0 12-06-2009 03:08 AM


All times are GMT -4. The time now is 09:58 AM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
×
UNIX.COM Login
Username:
Password:  
Show Password