Quick look at amazon EBS / instance storage performance

Lately I've been testing amazon EC2 and moving my virtual machines there. So I got a chance to test some EBS / instance storage block devices.

And my t1.micro instance got EBS performance like this:


And as you can see, this performance is not amazing. Slow writes, slow rewrites, nice reads (but still slower then 7200 rpm hdd). So you can't expect fast IO from t1.micro. But what amazes me is seek amount, almost like ssd storage. Strange but true. Of course those results varies on (I guess) resources available.

LUKS and intel aes-ni performance part 2

Lately I've bought laptop with Intel i7-3720QM. Laptop got 2 disks: SSD Vertex 120GB and original WD Scorpio 7200rpm hdd. I have to check LUKS performance of this setup ('cause I use LUKS on daily basis). And it looks like this (of course bonnie++ results):

HT on, WD Scorpio 320GB 7200rpm, lvm, ext4, no encryption:

Usb2 vs usb3 under linux

Lately I've been buying laptop for myself. And was wandering if I need one with usb3 ports. I've already got usb3 mobile 2'5 hdd, but I've thought that 5400rpm hdd doesn't really need usb3. Finally I've got laptop with usb3 so I have to run some tests ;).
Used bonnie++ on hdd connected to usb3 port and usb2 port. Here are results:



vSphere 5 hardware dependant iSCSI vs software iSCSI on Broadcom NetXtreme II 5709c

Recently I've been setting up vSphere 5 infrastructure with 2 iSCSI storages.

Linux software raid with 2-6 disks ext3/ext4 performance tests.

Lately I've got 6 500GB SATA 7200 rpm disks in my hands. So I decided to do some performance tests of linux software raid.
There are a lot of legends about raid levels, which are better for database or file storing. Also there are informations how much which raid layout loads CPU.
So I decided to verify those.

Ext3 / ext4 extended options with soft raid and simple performance tests.

I guess almost every linux admin heard that when you creating ext filesystem over software raid you should consider using extended mkfs options. Two important options for that operation are: stride and stipe-width, which you should calculate for your setup of raid (number of disks, level, chunk size). You can calculate all those parameters each time you create ext2/ext3/ext4, but there are lot of ready calculators to use. I'd prefer using this one. Cause it's simple and fast.

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by Dr. Radut