Community discussions

MikroTik App
 
mobilexpi
Frequent Visitor
Frequent Visitor
Topic Author
Posts: 95
Joined: Thu May 26, 2005 5:24 am
Location: Santiago

RB450G and Webproxy

Thu Oct 29, 2009 4:41 am

Hello,
I've a RB450G and I enable the WebProxy, and I've two questions:
-Can I install a 16GB SD card on it?
-How many concurrent users can manage the RB450G's web proxy?

Because I'm using only one PC for testing, and sometimes when I use the webproxy the CPU load is near 100%.

Best regards
 
guille4
Frequent Visitor
Frequent Visitor
Posts: 93
Joined: Tue Sep 29, 2009 9:23 pm

Re: RB450G and Webproxy

Fri Oct 30, 2009 2:24 am

read the docs and other posts about web proxy.

The SD cards is NOT recommended to use web proxy on it.

You should use a hard disk to do that.
 
mobilexpi
Frequent Visitor
Frequent Visitor
Topic Author
Posts: 95
Joined: Thu May 26, 2005 5:24 am
Location: Santiago

Re: RB450G and Webproxy

Fri Oct 30, 2009 2:58 am

And Can I connect a HDD to my RB450G?? I think no...right?
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 24608
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia

Re: RB450G and Webproxy

Fri Oct 30, 2009 12:43 pm

no, you can't, but microSD you can use fine with an average sized proxy.
No answer to your question? How to write posts
 
mobilexpi
Frequent Visitor
Frequent Visitor
Topic Author
Posts: 95
Joined: Thu May 26, 2005 5:24 am
Location: Santiago

Re: RB450G and Webproxy

Fri Oct 30, 2009 1:32 pm

Hello Normis,
thanknyou for you reply. Why microSD instead of SD card? Any special recommendation lije a specific brand or model?

My idea is to have a 8 or 16gb proxy.
Thank you
best regards
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 24608
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia

Re: RB450G and Webproxy

Fri Oct 30, 2009 1:36 pm

1. microSD is smaller, and easier to place on a routerboard
2. list of user tested cards: http://wiki.mikrotik.com/wiki/Supported ... mory_cards
No answer to your question? How to write posts
 
mobilexpi
Frequent Visitor
Frequent Visitor
Topic Author
Posts: 95
Joined: Thu May 26, 2005 5:24 am
Location: Santiago

Re: RB450G and Webproxy

Fri Oct 30, 2009 1:38 pm

Wow...you reply really fast, thanks
OK, I will look for a recommended card in the link.
Another question, is there a way to reduce the CPU usage of the proxy, because with only one computer behind the mikrotik sometimes the CPU runs near 100% when I'm using the web proxy.

Best regards
 
User avatar
Gennadiy51
newbie
Posts: 26
Joined: Fri Nov 06, 2009 4:33 pm
Location: Moldova, Chisinau

Re: RB450G and Webproxy

Sun Nov 15, 2009 2:38 pm

Hello Normis!

How it is possible to use microSD card, if cycle of writing allow only 10000 time?
X86 (Intel 566 MHz Slot1), RB450G, RB493G, hAP ac lite, hAP ac^2, hAP ac, wAP ac.
 
fewi
Forum Guru
Forum Guru
Posts: 7734
Joined: Tue Aug 11, 2009 3:19 am

Re: RB450G and Webproxy

Sun Nov 15, 2009 5:49 pm

10,000 write cycles would indicate a very bad card manufacturer. But even then, I guess it's just a definition of 'average sized proxy'.
 
User avatar
roc-noc.com
Forum Veteran
Forum Veteran
Posts: 869
Joined: Sun Dec 02, 2007 3:27 am
Location: Rockford, IL USA
Contact:

Re: RB450G and Webproxy

Sun Nov 15, 2009 7:14 pm

10,000 write cycles would indicate a very bad card manufacturer. But even then, I guess it's just a definition of 'average sized proxy'.
10,000 is probably accurate and one of the dirty secrets of the industry.

Show me a higher write cycles microSDHC card.

Sandisk microSDHC cards use mlc nand flash technology.

mlc based flash has 10,000 average write cycles. slc flash has 100,000 average write cycles.

I don't think they make slc microSD cards any more.

Tom
-----------------------------------------------
http://www.roc-noc.com
Tom, CCNA, ISP, USA Mikrotik Distributor
888-762-5662
-----------------------------------------------
 
fewi
Forum Guru
Forum Guru
Posts: 7734
Joined: Tue Aug 11, 2009 3:19 am

Re: RB450G and Webproxy

Sun Nov 15, 2009 7:31 pm

Point taken. Still, 10,000 write cycles on a 16GB card may be sufficient for a proxy that isn't too busy. If the proxy fills up the entire card before rewriting sectors it could do so once every day for 27 years.
 
User avatar
normis
MikroTik Support
MikroTik Support
Posts: 24608
Joined: Fri May 28, 2004 11:04 am
Location: Riga, Latvia

Re: RB450G and Webproxy

Mon Nov 16, 2009 10:03 am

remember that this is 10000 writes per sector, not per card. and the writes don't go to the same sector sequentially ...

we actually ran some tests on this a while back. the conclusion was that it's hard to kill a card just because it's write cycle limitations. however, if you repeatedly write to the same sector, then yes.
No answer to your question? How to write posts
 
User avatar
THG
Member
Member
Posts: 472
Joined: Thu Oct 15, 2009 1:05 am

Re: RB450G and Webproxy

Mon Nov 16, 2009 12:59 pm

The way that manufacturers deal with the management of write endurance internally within their products varies, but they all have the common theme of scoring how many times a block of memory has been written to, and then reallocating physical blocks to logical blocks dynamically and transparently to spread the load across the whole disk. In a well designed flash disk you would have to write to the whole disk the endurance number of cycles to be in danger.

SiliconSystems has a patented algorithm which delivers a lifetime which it claims is better than simplistic wear levelling. As of 30 Mar 2009, SiliconSystems Inc. (not to be confused with Silicon Systems Inc.) was acquired by Western Digital Corp. Another manufacturer Adtron actually has a percentage of spare flash blocks in the disk which are invisible to the host interface and don't show up as spare storage. But internally when blocks get close to the limit, the data is transparently switched over to the spare parts of the disk to give an additional breathing space.

Who is online

Users browsing this forum: xvo and 21 guests