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0
votes
1answer
27 views

Clone a VirtualBox VDI to make a second DRBD node

A primary node has been built up in a VirtualBox (guest RHEL 6 + DRBD). In order to get a second node with the same configuration, a VirtualBox cloning operation seems ideal easiness declare the ...
1
vote
0answers
13 views

Are there any tools/APIs to check consistency of a windows cluster?

Things to be checked: Directory structures (recursive, with any attributes and properties) Configuration (equiv and partial conf, format specific or generic, with regex) Registry (presence of keys, ...
10
votes
1answer
119 views

Why does yum index get corrupted?

Occasionally yum's cache gets corrupted and we see errors like this: error: db3 error(-30974) from dbenv->failchk: DB_RUNRECOVERY: Fatal error, run database recovery error: cannot open Packages ...
2
votes
1answer
250 views

OpenStack EC2 Ubuntu cloud image — SSH host keys were changed after emegency reboot

Recently one of our servers was hanged due to IPMI BMC failure. It is CentOS 6.3 OpenStack compute host serving KVM vitual machines with qcow2 backend. There was running a VM based on EC2 Ubintu ...
2
votes
3answers
115 views

zfs on a single device: what happens when a file is corrupted?

It is written everywhere that ZFS is helpful even if you only have one physical device, because it will tell you about data corruption due to bit decay and such. However, can it actually address such ...
1
vote
4answers
233 views

file-system incremental backup - ideally with no downtime for the web site

I am trying to design a web site with backup in mind. Large media elements would be stored on the file system and a daily backup would be done both for the DB and the file-system (which would hold the ...
2
votes
1answer
275 views

Is an SQL Server (Express 2008 R2) database operational during backup? How about consistency?

I am expecting to have a long backup on a certain database and I was wondering if the application can access (read only? read/write?) it while it is being backed up. If read/write access would be ...
4
votes
2answers
658 views

Guaranteeing ACID properties for InnoDB databases

What steps must one take to ensure that an otherwise defaultly-configured InnoDB server is truly ACID compliant? The InnoDB configuration page mentions that the hardware itself must be configured to ...
1
vote
3answers
233 views

Is NFS capable of preserving order of operations?

I have a diskless host 'A', that has a directory NFS mounted on server 'B'. A process on A writes to two files F1 and F2 in that directory, and a process on B monitors these files for changes. Assume ...