Disaster recovery and preparedness is an unfortunate aspect of systems administration. This tag should be used for help with planning, implementation and best-practices related to recovering from a catastrophic event on a server or in a datacenter environment.

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How do I force an exchange database to become “active” in “Active Manager”

How do I force a passive node to become "active" when the active manager says it's needing a full sync? Background We had a catastrophic failure where all that remains is a single edb file. No ...
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4k views

BBWC: in theory a good idea but has one ever saved your data?

I'm familiar with what a BBWC (Battery-backed write cache) is intended to do - and previously used them in my servers even with good UPS. There are obvously failures it does not provide protection for....
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1answer
182 views

Windows 2012 BCD process to boot from replicated LUN for Boot from SAN

For our infrastructure we have a production site and a disaster site with SAN-based replication for the LUNs on the Windows servers. So for our proof of concept we have one server on the production ...
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1answer
171 views

Recovering Linux soft raid 5, disk stays as spare

I got disk failure on my Centos Linux soft raid 5 array (mdadm). I replaced one of the disk and started to rebuild the array. Next time I checked the status, the rebuild was failed. This is the ...
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507 views

Identifying RHEL disk other than by UUID in /etc/fstab for Disaster Recovery from another site

For our disaster recovery setup there is a set of disk which are replicated from our production site to the disaster site. On the production site the RHEL servers have /boot filesystem setup on disks ...
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1answer
172 views

Amazon EC2 VM Import Connector Backup Strategies

I'm trying to get information on this connector but most of what i'm finding seems to be rather old info. My ultimate goal is to have my production virtual machines (esx 5.1) backed up to EC2 servers ...
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2answers
271 views

Rebuild home directory after deletion

This is what happened: root@rasp:~# ls -al total 72 drwx------ 8 root root 4096 Jan 22 21:01 . drwxr-xr-x 25 root root 4096 Sep 11 14:27 .. -rw------- 1 root root 8079 Jan 22 19:55 .bash_history -...
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289 views

How to perform Hardware disaster recovery with backup server

I have a two windows server 2003 R2 servers with same configuration(same processor,same motherboard etc). One is original server and another one is backup server(Not to store backup files,it is a ...
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154 views

Can proprietary SATA/SAS drives be used in a standard SATA controller

If I take SATA or SAS drives out of a Dell or HP server and install them in a different machine with a standard SATA or SAS controller will they still be readable? Obviously if they are part of a ...
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252 views

What would happen if I disconnected a child domain from it's forest domain controllers?

Windows 2003 native mode. One domain controller on-site, read-write, no RODCs. DNS is running on the DC onsite. Servers would be pointing to the DC for DNS and authentication. How long would the ...
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238 views

How can I plan a DR solution for an SAP Instance running on HP-UX

I'm supporting an environment that runs SAP on HP-UX. The HP Blade running the SAP Instance is connected to IBM Storage over FC connection. SAN Infrastructure is duplicated by redundant primary-...
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1answer
1k views

iSCSI Datastores not found after Power Failure

I have an ESXi 5 host running 3 virtual servers. 1 of these servers uses a datastore via Software iSCSI on a separate piece of hardware. When the two hardware servers (storage and host) experience ...
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873 views

Retrieving an RSA key from a running instance of Apache?

I created an RSA keypair for an SSL certificate and stored the private key in /etc/ssl/private/server.key. Unfortunately this was the only copy of the private key that I had. Then I accidentally ...
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1answer
1k views

How to get Mondorescue to work with LVM2 (CentOS 6.4)

I'm trying to make an emergency recovery disk with Mondorescue to: Restore my server in case of hardware (or severe software) failure. Make an "identical" server setup for debugging and staging. ...
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3answers
564 views

Probability of Blade Chassis Failure, Redundancy

Suppose I have a blade server HP C7000, with three blades. Q1. Is there any disaster recovery technique that provides redundancy between blades? If any one blade goes down the second should come up ...
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3answers
667 views

Replicating databases using Dell equallogic

Can the Dell Equallogic 6100/4100 replicate databases like mysql, MS SQL 2012, and Oracle 11g? I would like to set up my web applications and their databases in VMWare 5. They would run off the ...
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2answers
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(Financial exchange) colocation and DR sites

As far as I understand it, firms that colocate their servers with a financial exchange do so only at the primary site. (Correct me if I'm wrong). So what happens if the primary site goes up in flames ...
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2answers
4k views

Hadoop HDFS Backup & DR Strategy

We are preparing to implement our first Hadoop cluster. As such we are starting out small with a four node setup. (1 master node, and 3 worker nodes) Each node will have 6TB of storage. (6 x 1TB disks)...
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1answer
108 views

Best way to test disaster recovery in a virtual environment

We are using vCenter, eSXi 5.1 and Acronis vmProtect to run and backup a network of virtual machines, both windows and *nix based. it is the latter I am interested in today. Some of these still run ...
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585 views

RAID1 - Possible to recover failed drives?

PowerEdge 1850 has two physical hard drives, configured as RAID1. Accessing via DRAC 4/I I can see that both drives indicate Failed & Offline. However, the DRAC log indicates that both drives "de-...
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520 views

Small office backups, small NAS (RAID) vs single disk

Assume a small office situation, 5-10 workstations (PCs), and a Windows server hosting a network share. The Windows server is in a 3+1 RAID 5. I am debating with myself over a backup solution and I ...
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1answer
2k views

Recover mdadm RAID 10 array: listing all as spares

I'm a bad person and haven't backed up my RAID elsewhere. I now have a RAID10 array that won't assemble, and I'm hopeful I can save it. Here's the details: I have five hard drives set up as RAID10 (...
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3k views

can i say “NO” to “Clone multiply-claimed blocks” in fsck?

I need to know if i can still mount the volume when i tell fsck "no" in that question. i dont need to repair all the files in the volume, i just need recover one single file for this event. the ...
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2answers
2k views

How to mount parition in from a working driver in RAID1

One of hard drives in array is dead, I'm unsure if it's raid0 or raid1, what I'm trying to achieve is mount the working drive and make a backup of what's left. If I mount /dev/md127 then I can see ...
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Best Disaster Recovery Setup for Domain Controller with Additional Services

I'm setting up some new Windows 2012 servers to replace old ones currently on 2003. One of my concerns is to try and have a suitable DR plan to get them back up and running if we have a major failure. ...
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193 views

Bare-metal recovery on dissimilar hardware [Win/Linux]? [closed]

I'm planning a disaster recovery for our servers, and have been looking at this solution. I know of Clonezilla, but it does not entirely comply to the "different hardware" part. I could still ...
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1answer
108 views

Virtual installation vs bare metal for disaster recovery

I am part of an service company that has a server solution that hosts different field software to talk to industrial alarms and such. The original implementation didn't make use of any kind of ...
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792 views

Transparent geographical DR website failover

We've already got webservers that are loadbalanced. And even though outages shouldn't happen, they do, for a variety of reasons. (central switch failure, misconfigured ISP routers, backbone failures, ...
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4answers
529 views

How can I create a “fail whale” for my website?

I have a website that we load-balance across a few machines. The load-balancer (a Brocade ServerIron ADX) is on the local network. I know it has the capability to configure a "backup" ip address to ...
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1answer
72 views

Recovering Exchange 2010 from only one server

We've following setup: a) Physical server Hyper-V Exchange 2010 CAS 1 Exchange 2010 MBX 1 b) Physical server Hyper-V Exchange 2010 CAS 2 Exchange 2010 MBX 2 We do backups. But for the sake ...
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1answer
78 views

AWS ElasticCache - Cross Site - Disaster Recovery

I'm using AWS ElasticCache (MemCached) and can see how instances can be created at different data centers/sites. (eg: singapore A or B) There is no AWS Automatic Replication of ElasticCache from ...
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389 views

Exchange 2010 two nodes disaster recovery

I currently have one on-premises Exchange 2010 Std server sitting on a Windows 2008 R2 Entreprise. The server is backed-up on tape and now I've been asked to add an off-site replication for businness ...
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1k views

Out of band notification when UPS loses mains power?

We're currently looking into upgrading our UPS and possibly having a small petrol generator on site in the eventuality that the UPS battery is used long enough to drain it completely. Realistically, ...
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2answers
1k views

Accessing data on SAS drives if server fails

If my server goes down, how can i access the data on the SAS drives? I don't have another server to plug them into, and even then connecting the drive to a different controller (while keeping the ...
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3answers
1k views

Recovering with DDRescue Cannot Complete (write error: Read-only file system)

I'm trying to recover a corrupt VDI using vdfuse to mount the VDI and using dd_rescue to rescue the borked partition. dd_rescue seems to be working fine but once it reached about half of the ...
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0answers
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Exchange 2010 Database dirty shutdown

We experienced a power failure, after i bring the server up the Mailbox database is on a dirty shutdown state. I've ran eseutil /r E00 and got PS E:\BACKUPS_MDB_EXCHANGE\Mailbox Database ...
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1answer
76 views

Blackberry Outage: How can I PIN a large number of users?

We lost power due to the hurricane and need to notify BES users that services will be restored soon. How can I extract all BES users and send them a notification message? Also how do I alter the ...
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1answer
657 views

Drive cloning dd or rsync/sync via KVM

I've got a crash and the system won't boot correctly. I am getting errors like: ata3.00: status: { DRDY } ata3.00: status: { UNC } What would be the best way to save the main drive to make the ...
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264 views

Uptime concerns in case of AWS outage

I am running an Elastic Load Balancer backup by 2 instances in different Availability Zones in US East. I am using Multi-AZ RDS as well. Ideally this should ensure that if one AZ goes down, it should ...
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304 views

How to monitor how much data transfers between Exchange servers in DAG?

I recently installed a second Exchange Server (standard, 2010) to our organization as part of a Disaster Recovery solution. The two servers will soon be part of a DAG. Before placing the server at ...
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3answers
730 views

switching dns server providers

I'm trying to wrap my head around something that I thought I kinda understood, but clearly there's some piece missing. We're currently using Zerigo as our primary dns, with slave dns running on ...
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2answers
950 views

Active Directory Disaster Recovery in a Small Business

This is hypothetical question, but one I’m sure that someone must have encountered and/or given some thought to before. Situation: Consider this, a small business is running an Active Directory ...
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5k views

Active Directory disaster recovery with DPM

I have a sort of catch-22 question here. Suppose I'm using Microsoft System Center Data Protection Manager (2010 or 2012, it works the same way) to backup, amongst various other things, my Active ...
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3answers
5k views

If DNS Failover is not recommended, what is?

As a followup question to his very popular question: Why is DNS failover not recommended?, I think it was agreed that DNS failover is not 100% reliable due to caching. However the highest voted ...
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4answers
299 views

Virtualization for hardware resiliency?

Can anyone tell me if it is possible to pool several physical servers to run a resilient virtualization environment. Our servers are getting more and more critical to our clients and we want to do ...
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1answer
2k views

Recover data from SCSI hard disk

We've got an old server with SCSI hard disk. The server crashed last week and it isn't exactly known what hardware component is damaged. Since the server is due to be retired anyway we don't want to ...
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222 views

hosted failover(proxy?) service - does it exist?

We're in the planning phase to make our web application services redundant. Right now we've got our own physical servers at a colo, running a VMWare cluster connected to an EqualLogic SAN. It's a LAMP ...
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215 views

IIS recover from HD Copy

i'm here on a new server and want to recover the IIS Role, the old server is as a backup (rsync copy) on a second drive. Anyone know how to recover the IIS from a Directory? The Server is a Windows ...
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359 views

Clone a Red Hat RAID as part of a disaster recovery plan

I am looking for recommendations to clone a Red Hat mirrored raid to a single hard drive located in the same machine. The idea is if the servers hardware ever has an issue we have a similar hardware ...
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1answer
583 views

If my RAID card fails, how likely is it to corrupt the RAID?

My RAID card does not currently have a battery installed and its write mode is set to write-through. Data is rarely written to the RAID - large batches of data come in maybe every other week. Daily ...