Questions tagged [disaster-recovery]

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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70 views

Windows 2019 backup: bare metal restore

I'm rehearsing a virtual machine bare metal restore. Backups are taken daily and saved on a secure external server. We are assuming a total disaster, so bad that no domain controller is available, so, ...
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Copy binary file from other system with builtin shell commands only

I accidentally just have removed critical shared library and no one dynamically linked executable can't be run now. For example, even /bin/ls shows error while loading shared libraries: libunwind.so....
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AWS DR Setup and runbook

I'm working on creating a DR setup and runbook based on AWS. I don't have any experience with creating DR setups so it would be really helpful if the experienced veterans can guide me through it. ...
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Zerto Failover - Win 2012/16 Servers Get Stuck on “Getting Devices Ready”

We are using Zerto to replicate our VMs to an offsite datacenter. During our failover tests the VMs have a tendency to "hang" from 15 minutes to several hours on "Getting Devices Ready." I have read ...
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Does Barman need ssh connection setup when installed on the same host as the PostgreSQL host?

I'm trying to configure Barman (pgbarman) to work alongside the PostgreSQL database on the same host, i don't want to install barman on a separated host, but I can't find any documentation about such ...
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Recovering lost VHDX / VM (deleted by Veeam)

Earlier this week a VM on one of our hypervisors experienced extended downtime (~24 hours) due to some Windows updates going wrong. I ultimately was able to fix the issue, and noticed yesterday that ...
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212 views

Data recovery failure from Azure Data Recovery Vault using MARS Agent with on-premises computer

Despite trying several times since last night, the recovery of a volume from an Azure Data Recovery Vault to a new location on the original source computer fails after approximately (but not exactly) ...
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moving raid 5 hard disks from ibm x3500 m1 to ibm x3650 m1

one of our server ibm x3500 m1 type 7977 dead yesterday. can we move its hard drive to access data on raid 5 logical drive on ibm x3650 m1 server with same serveRaid 8K raid controller? Usman
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Database accidentally deleted with a bash script [duplicate]

Edit: a follow-up question: Restore mongoDB by --repair and WiredTiger. My developer committed a huge mistake and we cannot find our Mongo database anywhere in the server. He logged into the server, ...
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477 views

BTRFS unmountable after cold reboot (total_rw_bytes is twice too big)

One of my users in research environment invoked out-of-memory on a server which mounts a 52TB btrfs partition. I had to power cycle the server. After the reboot my btrfs partition cannot be mounted in ...
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Azure VM Site Replication

I'm looking to set up site replication for our Azure VM's. My question is this, how often are the VM's backed up/replicated to the DR site? Is this replication automated or would I need to kick off ...
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What happens to data in a GCP project if all owners or the project itself is suspended?

I have realized recently that a personal domain on google apps for business got suspended (the free for life version that was available in beta). This actually happened like 6 months ago and I didn't ...
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837 views

Recover ZFS data

Context/Hardware: HP microserver gen8 1x1TB - standalone, 2x4TB Raid 1x16GB iLO SDCARD with Debian + OpenMediaVault Event: SDCARD failure restarted server and installed Ubuntu on 1TB drive ...
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btrfs recover: reliable or last-straw?

The chunk tree of a btrfs filesystem corrupted and I could not recreate it after hour-long reconstruction. As a last resort (besides restoring from backup) I could use btrfs restore -S -x -m -v to get ...
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Recovering VCS 2 node cluster in DR?

We are looking for a solution to recover the 2 node VCS Cluster at DR location for a DR Test. Prod: Hardware is Dell with 24 cores 64 GB RAM with Suse 11.4 Linux over SAN Boot & 4 NIC's of 1 Gig. ...
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Can I shadowcopy/backup the AD search index?

We have a 1TB+ search index in our Server 2012 Active Directory (6.1) domain. This is located on a NAS, so rebuilding it takes "forever". For DR purposes, is there a way to correctly back up the ...
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Tried to recover a Ext4 Superblock to a CEPH disk

We have a server with Proxmox installed with Debian, it's an dedicated server (sda). The VM's are being backed up every night on a CEPH disk (sdb). After an reboot of the dedicated, the ext4 drive ...
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Possibility to recover from majority of C:\windows being deleted

So I have an interesting and somewhat fun scenario. A developer was working on some scripts that have worked in the past when run by him which deleted files in the working directory, but supposedly ...
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1answer
55 views

Can I restore a SQL Server instance from file backups only?

Our windows 2016 server failed to restart after a windows update yesterday. In order to avoid the update that crashed it issue (whatever it was), I'm in the process of rebuilding it clean. So I've ...
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326 views

Recover a failing node on Percona 5.5.41-37.0-55

I have a 3 node percona cluster of where 1 of the nodes has, because of a server crash, InnoDB log sequence problems. 180425 17:32:53 InnoDB: Error: page 151555 log sequence number 12431827692 ...
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51 views

Recovering software raid after a hardware raid array was created on the disks

I had a server with 4 x 500GB SSDs in a software RAID10 array. I moved these drives to a new machine that had an HP P410i Hardware RAID controller. I didn't want to use the hardware raid controller, ...
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58 views

Azure Site recovery

Planning for ASR and migrating all our servers to Azure in distant future from VMware. Issue is that we do not have any VPN capable device in the network and have read that it is necessary. Can ...
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195 views

What would cause mysqlcheck to incorrectly report a table as undamaged?

We are administering a MySQL server for one of our customers that has >100 databases with about 50 tables each, many of them InnoDB tables. The server crashed and I'm trying to find the culprit. When ...
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Synology: How to restore data from an accidentally deleted volumeX (BTRFS)?

The Synology in question has a RAID6 configured via mdadm which features a BTRFS filesystem mounted to /volume1. This path was mounted into a Debian chroot. The unmount was configured in the chroot ...
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428 views

Simulate power loss with force unmount?

I want to test disaster recovery of RDBMs after power loss under high load. My idea is to mount data directory under new mountpoint and then execute umount -f during the load and investigate outcome /...
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Cannot login to restored domain controller unless NIC removed

We have four DCs (Windows 2008 R2) running on VMware, backed up with Veeam. Currently doing some DR testing. If I restore a DC (full VM) from backup (obviously isolated from our production ...
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603 views

Is it compulsory to pick only a region pair as Azure DR region?

Certain Azure VM types (like some in G & M series that I require) are not available in the Azure region pair (US East, US West). Will there be any constraints on functionality if I choose an ...
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888 views

Mysql server crashes without lefting any log behind

I've a mysql server (v5.6) running on ubuntu server 10 x64. It's always up and running with a medium traffic, but every while it crashes & restarts without lefting any log message behind, after ...
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306 views

Cloudberry bare metal recovery network share access

I am doing a test backup and restore with cloudberry and running into an issue. My server is a Windows server 2016 version, running on vmware esxi. I have used Cloudberry to backup to a share folder ...
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649 views

create bootable ISO from USB flash drive recovery media with imgburn or other tool

I need clean my HDD and partitions but first did a recovery usb drive with the recovery tool, the recovery is one of Thinkpad E431 and was done right. I cant rely only on a fragile usb drive to keep ...
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132 views

Build mirroring on top of SQL2008R2 SQL cluster

On our SharePoint 2010 farm, we are using SQL 2008 R2. Currently, a SQL cluster (with 2 SQL server sitting at same data center) is built to provide auto-failover. However, it has no DR ability. We ...
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658 views

How to do a snapshot of a Datastore on esxi vmware - datastore snapshot as fast recovery backup

I have a server with hundreads of vms and the snapshot is very useful to me, on incidents i can restore a vm to a point on time in no time, but i have many datastores where operational data is stored ...
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226 views

Can Azure Backup and ASR protect the same workload?

I plan to use both Azure Site Recovery for high availability & DR of on-prem workloads replicated on Azure & Azure Backup for safety & recoverability of data related to the same set of ...
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2k views

MongoDB Active-Active Multiple Datacenters

I am looking for a method to configure MongoDB servers across 2 different datacenters where they remain in an active-active configuration. Site A is the normal Production environment that customers ...
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1answer
1k views

How do I configure a stretch cluster without shared storage between two sites?

I am trying to redesign our IT infrastructure and seeking help in implementing DR solution for our company. I see that as 2 data centers in active-passive mode with the data replication. Currently ...
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375 views

Recovering MySQL data from files on Windows

I had a server fail (disk failure, old server; no raid) at the weekend and am unable to recover the MySQL databases from the backup. After exhausting all the usual recovery options, I've performed a ...
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82 views

Postgresql HA PITR

I've had success in the past with MySQL's delayed replication feature which allows you to stop replication, inspect the bin log to find a bad query and SLAVE UNTIL just before said query and skip over ...
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777 views

Microsoft Azure Backup On-Premise Server Failure

I am running Microsoft Azure Backup, on-premise, and on the same machine that host my Hyper-V machines. I am backing up all my VM's on the machine both locally and in Azure Recovery Services (online)....
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How long will it take to create a new EBS volume from a 1TB snapshot?

I am taking periodic snapshots of a 1TB EBS (Amazon Web Services Elastic Block Store) volume as backup. In the case of the whole AZ (Availability Zone) becoming unavailable, my Disaster Recovery plan ...
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1answer
3k views

Is it possible to look up distances between AWS data centers?

My company is negotiating with a customer who has requirements for a minimum distance between data centers. Namely they require redundant storage in data centers more than 3 km apart. Is it possible ...
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Repairing corrupt Windows Server 2012 R2 Hyper-V VM using the host of an exact same OS

There's a Windows Server 2012 R2 Essentials machine which had an SSD failure. It hosts a Hyper-V VM of exactly the same type OS. The system never got to the state that it wouldn't boot, but we were ...
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Database server vs NAS for data files

Regarding costs and maintenance speed/simplicity in case of hardwar failures, does it make any sense to keep SQL data files on a NAS server, separate from the SQL Server instance? Our app stores large ...
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3k views

Keep the same IP and host name for new domain controller as crashed one

Because of some disaster I have lost my primary domain controller and thanks god that I had secondary domain controller so I could provide the service to the computer and save my data. After that I ...
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675 views

Can't get my RAID array out of degraded mode

I've got a 4-drive RAID 10 array that has just had a drive failure. I ignorantly have never practiced how to recover from a failure (I'm a programmer, just keeping this server as a hobbyist) so I'm ...
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How do you securely shred a file from a RAID 6?

I'm looking for a way to delete a file from a RAID 6 implementation in a secure fashion (shredding). Do I need to delete the file from the RAID, disassemble the RAID, wipe the free space of each drive,...
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78 views

Single Domain Controller FSMO holder DR

We are looking at the topic of DR at the moment and I would like your expert help in the creation of a DR plan in the event that our PDC somehow goes kaput! Info: Our PDC holds all FSMO roles We have ...
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253 views

Allowed production maintenance during business hours [closed]

I recently came into managing a small startup. As most small startups, I would think, we have been doing what we wanted in production virtually when we thought it was okay. People are careful and ...
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Disaster Recovery for VMWare ESX

We need to formulate a plan for disaster recovery a VMWare installation. The components are two ESX hosts and a NAS unit. We're wondering what everyone here uses for their farm? We have a few ideas ...
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2TB NTFS Partition Works in linux, Causes windows to hang

I have a ESXi server containing a large virtual disk (1.8TB) on RAID 0, and the server suffered from a power outage. The drive was a storage drive for a Windows Server 2012 R2 file server, which is ...
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Azure regional pairing for G series VMs

Currently G series VMs are only supported by US East 2 and US West Azure regions - both of which are not DR pairs. How can Disaster Recovery for G series VMs in the US, be handled?

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