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• SQL 2008 Mirroring, how to failover from the mirror database?

  - by Luis

  I have configured a database mirroring setup in SQL 2008 using the High-safety, Synchronous mode, without automatic failover. I don't have a Witness instance. Regarding high availability, I understand Mirroring is a better strategy than Log Shipping (faster and smoother failover), and cheaper than Clustering (because of license and hardware costs). According to the MS docs, to do the failover you need to access to the Principal database and in the "Mirror" options click the "Failover" button. But I want to do this from the Mirror database, because what would be the benefit as all this setup is being done in case the Principal server knocks down? Evidently I am missing something. If Mirroring is not a solution for server downtime (as would be Clustering, if I understand correctly), then which practical (i.e. real world examples) cases would benefit from Mirroring for high-availability purposes? Thank you very much for your response! I really need some enlightment.

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• Assigning security groups different ranges

  - by Mustafa Ismail Mustafa

  Is it possible to assign a security group in windows 2008 a specific DHCP scope? Meaning, let's say we have 2 groups, employees and managers in the superscope Company. Assuming that each user is distinctly in either group and there are no overlaps, would it be possible to assign members of the security group employees a dhcp address in the range 192.168.1.0/24 and managers 192.168.2.0/24 ? The DHCP server is the same server. This is on Windows SBS 2008 if it makes any difference If it is possible, how do you go about setting it up. TIA

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• Sql Server 2008, Active Directory Groups, and Failed Logins

  - by Ryan Michela

  I keep getting a Login Failed error in my ASP.net application when connecting to my SQL Server 2008 database. I am trying to login with the user domain\foo. When I grant a database login (server and database level) for domain\foo, my application can connect. When I put domain\foo in a group called domain/goo and give domain\goo a database login, the user domain\foo cannot authenticate. This does not make any sense. Am I doing something wrong? domain\foo and domain\goo are configured identically. The only difference is that on is a user and one is a group containing a user. Adding active directory groups as users to SQL Server 2008 is supposed to work.

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• How to add LDAP user to existing local group in RHEL?

  - by Highway of Life

  I'm attempting to add some of our LDAP users to a locally defined group on our RHEL server, however I get an error stating that the LDAP user is not found in /etc/passwd. What would be the best way to allow LDAP users to be added to local groups? My feeling is that this must be done manually. I could edit: /etc/group and add the LDAP group to the list. Would that be ideal? [server]# id apache uid=409(apache) gid=409(apache) groups=409(apache) context=user_u:system_r:unconfined_t:s0 [server]# id john.doe uid=11389(john.doe) gid=6097(ABC_Corporate_US) groups=6097(ABC_Corporate_US) context=user_u:system_r:unconfined_t:s0 [server]# /usr/sbin/usermod -a -G apache john.doe usermod: john.doe not found in /etc/passwd OS: RHEL (Red Hat Enterprise Linux Server release 5.3 (Tikanga)) Note: Updating the OS on this machine is not an option.

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• Availability of downloadable DNSBL dumps?

  - by mtah

  I need to cross-reference data involving a large number of IP addresses against known public proxies, spam-listed IPs etc. For obvious performance and network load reasons, obtaining a regularly updated dump for off-line processing would be preferrable. I currently use http://www.dnsbl.manitu.net/download/nixspam-ip.dump.gz - a digest of ix.dnsbl.manitu.net with 40,000 entries updated every 15 minutes. I'd like something more substantial though, so my question is: does such a thing exist?

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• PDU management interface has low availability - product flaw or isolated issue

  - by DeanB

  Our colocation provider has supplied us with APC AP7932 switched 0U PDUs as part of several cabinets they provide us. We have had a lot of trouble with the network management aspect of these PDUs, which I'll describe below. We are moving to cage space in the same datacenter, and plan to provide our own PDUs, so I'd like to determine which enterprise-grade PDUs have been reliable performers from a remote management perspective. Our colo-provided PDUs are configured to support management via an SSL web UI and via telnet. We updated the firmware on all of them to the current version as of NOV2011. They respond to pings reliably, and we have no reason to suspect a network layer issue. However, we experience frequent hangs, timeouts, disconnects, and general unavailability from the embedded management host in all of the PDUs. We occasionally have to restart the microcontroller on the PDU to recover from what appears to be an occasional hard fault. The outlets stay powered (thankfully), but the management aspect is so unreliable that it has become an ops liability - we can't be confident that we could get into the PDU to power cycle a host if we needed to. We have 3 PDUs that all exhibit identical behavior. There are many manufacturers of enterprise-grade 0U switched PDUs, all with comparable features. If I looked at the datasheet for our current PDUs, they would appear to be a good fit -- only with the benefit of suffering through using them do we know to avoid them. I'd like to avoid picking a PDU that looks fine on paper, but has similar reliability issues. What has been others' experience with switched PDUs? Is this level of flakiness normal?

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• AD LDS High availability

  - by user792974

  We are currently using CAS for multiple directory authentication. AD for internal users, AD LDS for external users. I've read that NLB is a possible solution, but wondering if this is possible with SRV records, and how about you would correctly configure that. With our AD directory, I can bind with olddomain.local, and hit any of the DCs in the domain. We don't want to hardcode servernames into CAS, so the end goal is to bind with LDSdomain.gov. nslookup -type=srv _ldap._tcp.LDSdomain.gov returns _ldap._tcp.LDSdomain.gov SRV service location: priority = 0 weight = 100 port = 1025 svr hostname = server01 _ldap._tcp.LDSdomain.gov SRV service location: priority = 0 weight = 200 port = 1025 svr hostname = server02

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• Monit network availability checking

  - by viraptor

  Hi, I'd like to start a service with monit but only when I have the correct ip bound to the host. Can this be done somehow with the normal config? For example I want to start a process xxx with pidfile xxx.pid, but only if host currently has 10.0.0.1 bound to some interface.

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• SQL Server 2008 R2 100% availability

  - by Mark Henderson

  Is there any way to provide 100% uptime on SQL Server 2008 R2? From my experience, the downtimes for the different replication methods are: Log Shipping: Lots (for DR only) Mirroring w. NLB: ~ 45 seconds Clustering: ~ 5-15 seconds And all of these solutions involve all of the connections being dropped from the source, so if the downtime is too long or the app's gateway doesn't support reconnection in the middle of task, then you're out of luck. The only way I can think to get around this is to abstract the clustering a level (by virtualising and then enabling VMWare FT. Yuck. Good luck getting this to work on a quad-socket, 32-core system anyway.). Is there any other way of providing 100% uptime of SQL Server?

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• SqlServer2005 Enterprise Fast Recovery, SqlAgent Availability, and Replication

  - by automatic

  I have a database under SqlServer2005 Enterprise 64bit sp3, that is in phase 3 of 3 of recovery after a reboot without normal shutdown. It looks like with fast Recovery, the database became available when recovery moved into phase 3. However, it seems (based on message in SqlAgent log), that SqlAgent is "started" but not available to run jobs until recovery completes. I have other databases on the same server that are transactional publications. It seems to me that if I let users update the published databases, transactions will start to build up in the log, but won't be moved to the distribution database or onto the subscribers because SqlAgent isn't running jobs. Should I be overly concerned about performing updates before

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• System Monitoring Redundancy

  - by Josh Brower

  I consult in a small business environment where I have two HyperV hosts (with <10 VMs) + a couple other servers. I recently had an issue where one of the HyperV hosts had a CPU issue and it came down, bringing most of my non-critical VMs with it, plus a free piece of software that I use for network & system monitoring and availability. Because of this, and the fact that iDRAC locked up to, I did not get any alerts about the crash. So I am wondering how I can (cheaply) get a redundant availability monitoring system in place--Is is as simple as running Nagios or Zenoss (or whatever) on two different HyperV hosts? It just seems like running more than one copy of Nagios/Zenoss/etc could be expensive and have high overhead. Thoughts? Thanks! -Josh

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• Send mail from a distrobution groups email adress

  - by Campo

  A user has send permission on a distro group on a WINDOWS SERVER 2003 domain. I am the admin. When either of us send email using the distrobution groups email adress we get a non delivery report Your message did not reach some or all of the intended recipients. Subject: TEST Sent: 4/19/2010 4:46 PM The following recipient(s) cannot be reached: [email protected] on 4/19/2010 4:46 PM You do not have permission to send to this recipient. For assistance, contact your system administrator. MSEXCH:MSExchangeIS:/DC=local/DC=DOMAIN:SERVERNAME Thanks, JC

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• Cheapest High Available Web Server [closed]

  - by xyz

  I would like to create a high-available setup (e.g. a small cluster) for a webserver, i.e. it will run Apache, PHP and MySQL. There will be between 2-8 small websites running with only very little traffic and workload. High availability is however very important. I don't want to be dependent on 1 datacenter, so there must be a minimum of 2 servers placed in different datacenters, and if one server goes down, the user must experience no or only a minimum of downtime - and no data loss. I have considered Amazon AWS using their Elastic Load Balancing, since it is possible to buy 2 EC2 instances in 2 availability zones and set up load balancing and RDS (Multi-AZ). However this seems rather expensive. Using the AWS price calculator http://calculator.s3.amazonaws.com/calc5.html it totals to 185$/month the first year (including the free tier). Are my calculations incorrect or is there a cheaper way to make this HA setup? Best regards

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• High Availability

  - by Barrett

  Has anyone setup Advantage Database Server using a failover cluster? If so, did it work and do you have any tips or tricks that you can share?

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• List existing file server permission groups/users

  - by Patrick

  So we have taken over a new client and their existing file server is frankly a mess. We have migrated their old file server from a 2k box to a 2k8 DFS cluster and now I'm looking at rebuilding both the folder structure and their permissions. Unfortunately its been half done with AD groups (poorly named/no description/notes) and half with individuals named in security on the folders themselves. What I'm looking to do is to dump a complete list of all the folders with their security permissions (ideally I'd like to ignore files but not essential). CACLS got me half way there but fails with an odd error message and its output isn't particularly user friendly and I'm working with roughly 2Tb/250,000 files here so I really need something that gives me a bit more functionality. Question : does anyone have any experience of something similar/know of a bit of software that might help me out?

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• SQL server availability issue: large query stops other connections from connecting

  - by Carlos

  I've got a high-spec (multicore, RAID) server running MS SQL 2008, with several databases on it. I have a low throughput process that periodically needs a small amount of information from one of the DBs, and the code seems to work fine. However, sometimes when one of my colleagues does a huge query against one of the other DBs, I see full CPU usage on the machine, and connections from my app time out. Why does this happen? I would have thought the many cores and harddisks would somehow (together with cleverly written DB server) be able to keep at least some of the resources free for other apps? I'm pretty sure he doesn't use multiple connections for his query. What can I do to prevent this?

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• Multi domain server with dedicated SSL's HA

  - by user3692800

  I am hosting a server with 150 domain names (websites), each of the ssl's requere dedicated IP address. So server windows 2008, with 150 IP addressees and 150 websites. I need to have high availability solution. So thinking setting up AWS but ELB will not be a solution... and max IP's I can get per instance is 12 addresses. So what can I do to have all 150 sites hosted on one instance and be HA with instance in different availability zone.

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• Freenas & LDAP Multiple User Groups Not Taking Affect

  - by Daniel Baker

  we are using, Freenas 9.2.1.7 which communicates with LDAP to control file permission. We have Windows users in multiple groups. Some belong to Finance as their primary group and Admin as another group they belong to. They can only access files from their Primary group. We use LDAP Account Manager - 4.4 to control which group the users belong to. We have also been trying to control access from the command line. We hae tried using this : setfacl -m group@:rwWxpaRc::allow DIR / Or File Name The problem is only the primary group is being seen / used. I am trying to determine why only on group is being used. Can someone please help me diagnose where the problem is. Thanks for the help, Dan

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• High Availability Clustering and Virtualization

  - by tmcallaghan

  I'm trying to understand how the various virtualization vendors (specifically Amazon EC2, but also VMware and Xen) enable software vendors to provide a real HA solution in the environment where the servers are virtualized. Specifically, if I'm running any HA application (exchange, databases, etc) I need to ensure that my redundant virtual "servers" aren't located on the same physical server. Using in-house virtualization solutions (VMware, Xen, etc) I can provision accordingly as well as check the virtual - physical arrangement. I could, however, accidentally "vmotion" to the same physical hardware. With EC2, I don't even have the ability at provision time to select different physical servers. Since their Cluster Compute Instances are 1 virtual server per physical server it seems to be the only way to guarantee I don't have a false sense of redundancy. Any ideas or thoughts would be helpful. What are others doing about this problem? If the vendors provided an API where I could get something as simple as a unique physical system identifier I could at least know if I'm going to have an issue. -Tim

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• "Windows Groups" missing from NAP Conditions

  - by Tim

  I am trying to configure a NAP policy for a 2008 R2 server running AD services. I have done this before and there is a condition for "Windows Groups". It is missing from the Conditions list, this time, though. I have registered NAP in AD I have restarted the NAP service I have rebooted I have removed the server as a NAP/IAS server in AD and re-registered I have removed the role and added it again I can't seem to find this in my googlings. Help is appreciated. Thanks.

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• Availability of big files on multiple servers

  - by Imises

  I have to handle many (1'000 - 30'000) big files ranging from 200MB up to 2GB. The demand for these files is variable (0 - 300 downloads / file). This is why a single file must saved on 2 or more servers. My servers are placed in different datacenters (France), with different size HDDs (750GB to 4TB). Currently I share the files using PHP and ncftpget / ncftpput, but it's very slow. I need a solution to handle balancing these files across 7+ servers.

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• DallasXAML.com – A New User Group for Silverlight, WPF, XBAP, etc.

  - by vblasberg

                                   http://DallasXAML.com   I’ve devoted much of last month to starting the DallasXAML User Group.  I finally got back into user group management after 2 years away from leading the Dallas C# SIG.  Now I’m having fun getting a Silverlight/WPF user group going strong for the Dallas / Ft. Worth community.  Our first meeting was March 3rd at the Improving Enterprises offices in North Dallas.  We had about 25 to 35 attendees in the first meeting and it went well.  We covered the most important topic that everyone should understand well – data binding.   So I chose the XAML user group so we can get together for a common group improvement in the Dallas / Ft. Worth area and learn cross-technology information that we can use now.  It is not a lecture hall.  The great thing is that we’ll provide hands-on experience with most every meeting.  The goal is to get the experience that we can use the next work day.  I unfortunately broke that rule by speaking all through the first meeting, but next month is part two with more hands-on data binding.   The differentiation is this group concentrates on XAML, not Silverlight or Windows Client alone.  What we learn in one area, we gain for all areas.  That includes the Silverlight for Windows Phone 7 coming later this year.  Next year it may be Windows Phone 8, 9, or whatever.    I started developing WPF seriously almost a year ago.  I experienced the painful learning curve.  Anyone who reports that there isn’t a big learning curve either thinks in XAML before it was developed, is on the Silverlight or WPF development team, or has already conquered the learning and forgot the pain.  So I wanted to share the pain or make it easier for others – same thing.  I have found that the more I learn and use good disciplined techniques, the more interesting and rewarding development is again.   A few months ago, I was sitting in the iPhone development session at the Dallas C# SIG.  After the meeting, the audience was polled for future topics.  After a few suggestions, Silverlight got the big hands up.  That makes sense because it’s still the hot topic for many Microsoft developers.  So I surfed around and found that there aren’t enough user groups to help in this area.  I polled a few local group leaders and did the work to start the group.  This week I got a telerik controls licence and improved the site with some great controls, namely the RadHtmlPlaceholder control.  It provides a Silverlight control to show HTML in an IFrame-like area.  On DallasXAML.com, the newsletters and resource pages display in HTML because Silverlight just isn’t there yet.  I’m looking forward to a Silverlight XPS viewer with flow documents.  There are some good commercial version available, but this is a non-profit group.    The DallasXAML.com site points to many other resources such as podcasts and webcasts.  I would rather give them the credit than try to out-do them.  So check out the DallasXAML user group site and attend our meetings if you can.  We meet the first Tuesday of the month.   -Vince DallasXAML User Group Leader  

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• Address Book Groups - iPhone Simulator

  - by Stef

  Hi All, Is there a way to set up groups on the iPhone simulator? I want to set up a specific group on the iPhone and insert contacts into that group... I've presented the address book modally like in the tutorial but in trying to access groups, I've realised there's no option... Thanx Stef:-)

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• [SharePoint] - Security based on 2 Active Directory groups

  - by Maarten Louage

  Hi all Let's say I have 2 AD security groups: "Access to SharePoint" and "Access to Archive". How do I set the security in this way on a SPWeb that only people who are member of both groups, are allowed access? Is this possible with out of the box AD tools? Thanks!

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• Community "Groups" feature (Ruby on Rails)

  - by timstepp

  Are there any good examples/plugins that enable users to create groups within a community application. For example, I would like to create a Group class and add it to something like Community Engine (http://communityengine.org/). Essentially, users need to be able to create and manage groups that other users can join (much like Facebook Pages). Thanks!

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