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4
votes
3answers
155 views

How reliable are current 2 TByte consumer grade disk drives?

Most cheap SATA disk drives are rated with "1 non-recoverable read error per 10^14 bits read". What does this mean? 10^14 bits is just 12.5 TByte. If I have a full 2 TByte disk and I copy it to a ...
2
votes
2answers
586 views

How does mtr work / interpreting pain points using mtr

I have been recently trying out mtr to get network congestion pain points. Following are sample mtr requests Example1 $ mtr --report -c 10 my.url.com HOST: ansh0l-Lenovo Loss% Snt ...
0
votes
0answers
37 views

Switching from Windows Server to NAS

so I recently started my new job as an IT specialist in a small media agency (~6-8 people). We currently struggle with the server crashing occasionally (within 4h - 48h) probably due to a hdd / ...
-1
votes
1answer
63 views

PCIe SSD - how reliable it is?

Since The database will be very read/write intensive, and there is alot of delete queries which will be executed : How reliable could be PCIe SSD , and how fast will it degrade on alot of delete ...
0
votes
3answers
251 views

I/O on SSD hosting a DB periodically hangs with queue length peaks of 800+

i have a problem which i cannot identify correctly. I have a process (on WinSrv 2008 R2) which imports data into Mongo DB and periodically whole system freezes - once per 5-10-15 minutes for about ...
113
votes
6answers
11k views

Are SSD drives as reliable as mechanical drives (2013)?

SSD drives have been around for several years now. But the issue of reliability still comes up. I guess this is a follow up from this question posted 4 years ago, and last updated in 2011. It's now ...
1
vote
2answers
353 views

TCP vs UDP Error-Checking

I've bounced upon two articles that describe in-depth on how TCP and UDP connections work. However there is some kind of inconsistency. Where one article tells me that UDP does no Error-Checking at ...
2
votes
3answers
121 views

Achieving Five Nines

I am building a web application where uptime is key. I understand that 100% uptime is not realistic but I would like to achieve five nines. I'm unsure as to the most prudent way to accomplish this. ...
2
votes
2answers
1k views

Windows Server 2012: Possible to have High Availability and reliability without needing a SAN, but connecting servers together?

I have some questions below -- tried to word them the best I could. If you downvote my post, please make a comment explaining why you downvoted so that I can try to do better when I post in the ...
1
vote
1answer
2k views

Why does VPN IPSec client use UDP?

The VPN I use on my home Windows computer to connect to my company's servers is a Cisco client. The client is configured to use "IPSec over UDP (NAT/PAT)". Why would you use UDP, an "unreliable" ...
6
votes
3answers
2k views

Does it make sense to install online spare memory?

I'm using HP DL360p Generation 8. I need a pretty reliable server, so I'm using RAID 1 with a spare drive, and I also added an extra power supply. But should I install online spare memory? Or ...
0
votes
2answers
95 views

Network adapters reliability

Can you help me with understanding of reliability of network adapters. Most of the time servers do have at least 2 NIC's bonded to provide sort of a HA for it. So in case of one NIC fails, the second ...
0
votes
2answers
653 views

Making a hot spare with automatic failover

I currently have a VPS hosted in Charleston, NC. My current provider is offering a deal to purchase an identical (resource wise) VPS in another data center. Although I rarely experience downtime, I ...
6
votes
4answers
799 views

The importance of ECC memory

Are ECC memory modules important to have on a non-critical server? I was thinking about getting myself a toy dedicated server for lots of random, non-critical stuff. Sporadic reboots are no big ...
1
vote
0answers
109 views

Obtain event servity from Win32_ReliabilityRecords

Microsoft introduced the "Reliability Monitor" in Windows Vista. I use WMI to access this information, and more precisely I query the Win32_ReliabilityRecords class. This yields the list of events ...
1
vote
6answers
707 views

How to protect power strips from accidental shut-offs/“cleaning lady” attack?

Are there any power strips or products designed to defend against a "cleaning lady" attack (cleaning crew is vacuuming the floor and bumps the power strip switch, turning off all the connected ...
0
votes
2answers
198 views

How to troubleshoot many failed pageloads?

I've had a few cases in which the homepage of one of my sites wouldn't load in the browser. The site is running on django/fastcgi/nginx. It was difficult to reproduce so, in an attempt to understand ...
2
votes
1answer
318 views

Ubuntu server burn in test

We've assembled a simple storage server with COTS SATA disks that we're planning to tie together with software raid (Ubuntu Server, mdadm). What burn-in tests can one run to test the system, in ...
4
votes
1answer
1k views

DNS Failover with multiple Nginx load balancers

Our application is hosted on EC2, however because the nature of the app, it requires extremely high availability. We have an image of the app running on Linode as a failover. However, doing a DNS ...
5
votes
4answers
1k views

Automatically-reconnecting TCP tunnel

I have an unreliable network connection between two machines: sometimes active TCP connections get dropped for reasons beyond my control. I want to establish a reliable TCP connection between the two ...
2
votes
2answers
2k views

How do you setup a SQL 2005 cluster in amazon EC2?

I am trying to setup a highly-available DB architecture in an EC2 servers. We are forced to use SQL 2005 for now. What kind of solutions would work in this context? Has anyone done it? I can't ...
2
votes
1answer
597 views

SSD system disk durability?

This is a follow up to Server System drive on a USB stick? Good? Bad?. I set my mind on this 2GB motherboard mountable PATA SSD. (I already ordered it because I had a voucher, this question is to ...
3
votes
4answers
11k views

Is there a reliability difference between 2.5“ and 3.5” HDDs?

I know there are a couple of key characteristics that determine the reliability of HDDs, but is there a difference between 2.5" and 3.5" drives? In the past I've always assumed that 3.5" drives ...
0
votes
1answer
825 views

how to make ext4 more reliable? [closed]

As ext4 introduced more reliability than ext3 with block journals, is there any chance to suppose it 100% reliable? What if enabling block journaling on it, which is disabled by default? I have an ...
3
votes
3answers
300 views

What is the best strategy to monitor health of hard disks?

What strategies do you use to monitor the health of your server hard disks? Do you schedule an automatic chkdsk with reporting? How are you alerted of failures?
3
votes
3answers
190 views

Can USB powered device affect longevity of the port?

Looking to purchase a new DVD Writer for the first time, I notice there are USB powered devices available which do not require an external adapter/power-supply. This may be sufficient for stuff that ...
2
votes
3answers
81 views

Set up a temporary reliable database server on a budget of $0.00

I am helping run a Model United Nations conference for high school students. The conference is completely organized and staffed by university students. I am writing an application that will keep track ...
3
votes
5answers
1k views

redundant http load balancer

Got a simple scenario with two web servers for redundancy and to scale. But how do I make a two web-server setup fully redundant? I can think of two solutions; two web servers, one load balancer ...
2
votes
5answers
1k views

How common are power supply failures in comparison to hard disk failures?

My webhost offers two different types of high availability options for dedicated servers: Redundant hard disks (RAID1) Redundant hard disks (RAID1) plus redundant power supply How common is a ...
7
votes
4answers
1k views

Tape vs SSDs backups regarding long-term storage reliability

My question is very specifically about solid state drives, not regular hard drives. I would like to put in place a grandfather-father-son backup scheme, with the SSDs being used for the grandfather ...
3
votes
1answer
249 views

Failsafe Ethernet Switches on UAV

As a side project we are working on a new internal network for a small UAV and will base it on 100mbit Ethernet instead of serial coms that's usually used for these types of aircraft. We have gone ...
0
votes
3answers
65 views

Autodialing software?

I need to have a computer automatically call my office and maintain the telephone connection for at least 2 minutes. The reason for this, is I've contracted with a squirrelly VOIP provider that I ...
5
votes
2answers
3k views

It is XFS reliable? In case of a power gone off is xfs riskier that ext3 in data corruption/safey?

I have been having some electrical issues,mostly power going out suddenly for a few months,and although ups solve the thing mostly. But still i am worried about filesystem corruption,and data lost. ...
14
votes
6answers
2k views

Cost effective, long term archival of video and image data? ~50 TB

My lab is in the process of setting up a small server that holds data (mostly video and image data, plus a few documents) for the project our group is working on at a moment in time. Historically, ...
2
votes
5answers
189 views

Are web servers/services more prone to fail outside of working hours?

I've just had a server outage at 4.59AM on Sunday morning, and looking through our uptime records going back to 2006 all except for 4 outages out of 20 occured between 11PM and 6AM. (Only looking at ...
0
votes
2answers
131 views

Verifying hosted VOIP PBX uptime

For the second time, I'm outsourcing my VOIP hosting to a provider, whom I have to trust their sales pitch of 45 minutes down per 365 days. Is there an automated way I can test their server(s) ...
1
vote
1answer
181 views

Consistent Reliable Messaging

Hay All.. Im working a new project, Im currently deciding between flume & scribe for messaging systems... ( most probably sent to logs or hadoop ) I cannot lose a message ever.. What are ...
1
vote
3answers
176 views

How to make PHP more scalable on Unix Apache

I'm looking for free/low cost ways to make PHP running on our Unix Solaris servers (under Apache) more scalable and reliable. Do you recommend the free version of the Zend Server? Are there other ...
0
votes
2answers
382 views

To what degree can I trust a given storage device?

Apologies for the horribly vague question... What are the error rates for reading and writing to storage devices, and do our file systems and OS's account for this? I've had bad sectors on my ...
6
votes
3answers
648 views

A strategy for network monitoring to improve network health?

The goal is to find out which parts of network should be upgraded / reorganized to improve network health (reliability and performance). What are the methods to monitor network traffic, detect ...
1
vote
8answers
1k views

Incoming mail from sender, MX record won't accept replies. How to block the incoming SMTP connection from that sender?

I'm administrating a mail service for a small business. They have a mail host, foo.example.org, whose internet connection is an ADSL service with a permanent IP address. Unfortunately, many mail ...
6
votes
6answers
3k views

How stable is zfs-fuse 0.6.9 on Linux?

I'm thinking of using ZFS for my home-made NAS array. I would have 4 HDDs in raidz on a Ubuntu Server 10.04 machine. I'd like to use the snapshot capability and dedup when storing data. I'm not so ...
7
votes
3answers
749 views

Can an SSD notify the hosting OS that its wear level is getting high?

I read a lot about SSDs and I am interested in them for server use. My biggest concern is their reliability. A lot of writes shortens their life span. I can mitigate this problem if I can run some ...
3
votes
5answers
495 views

Solid State Hard Drive

It's said that Solid State Drive is much better than SATA one as there is no spinning head or os. So, there won't be hard disk crash problem?
1
vote
2answers
2k views

How to configure Apache to automatically restart itself every N requests?

We host svn on Apache 2.2 and it's memory usage slowly grows until it just halts. I've heard that there's a magic settings that makes Apache restart itself automatically after processing every N ...
1
vote
5answers
518 views

When running a shell script, how can you protect it from overwriting or truncating files?

If while an application is running one of the shared libraries it uses is written to or truncated, then the application will crash. Moving the file or removing it wholesale with 'rm' will not cause a ...
1
vote
3answers
91 views

Fast and reliable desktop-grade drive

I'm looking for desktop-grade drives to build a distributed storage cluster (chunks are replicated on software level). I don't mind their mission critical ability, which clearly impossible with their ...
2
votes
1answer
79 views

Looking for a reliable web provider that supports ASP.NET? Shared LAMP account a plus

My title is probably not very clear but here's the deal. I'm a software engineer with experience in many languages but my current focus is Windows/Web applications using C# and .NET. I'm currently ...
7
votes
7answers
826 views

Questions about single point of failure for small operations

1) If you can't afford or don't need a cluster or spare server waiting to come online in the event of a failure, it seems like you might split the services provided by one beefy server onto two less ...
1
vote
3answers
934 views

network layer reliability

I have a question about the reliability of network layers, I think in the network layers there is a redundancy, my question is why both link-level and end-end reliability need?