You are in: Articles / Operating Systems / Avoiding disaster recovery pitfalls in VMware and Linux

Avoiding disaster recovery pitfalls in VMware and Linux

(Richard Jones, TechTarget) Last year, at several seminars on advanced enterprise virtualization, I asked attendees about their virtualization deployments. Most had deployed VMware with the Virtual Machine File System (VMFS) as the storage file system, but few had deployed virtual machines (VMs) with raw device mapping (RDM) for storage access.

When creating storage for a VM, VMware's cluster file system, VMFS, is the default and follows the simple path, creating virtual disks inside a VMFS logical volume on a logical unit number (LUN). Then when you install a Linux OS, you can use the default. While the simple default settings for creating VMs may speed deployment and appear to reduce management overhead, these default settings pose problems. The central issue is that these settings target the simplest case without regard for particular system requirements. Defaults are often designed for a product evaluation, where ease and speed are the objectives. But particularly when it comes to disaster recovery (DR) and backup, consider the possible long-term effects of these default settings. Let's consider some enterprise scenarios to illustrate how default settings can be a bad move in virtual deployments.

Serverless backup and raw disk maps
As more modern applications are stored, it takes more time to back up or restore an application's data. But this opposes business disaster recovery demands of shorter recovery time objectives (RTOs). Compounding the situation is the ability of modern servers with more processor cores and memory to host higher VM consolidation ratios that can tax limited host backup/restore I/O bandwidth. All three factors have resulted in backup and recovery times that are unacceptable today compared with just a few years ago.

The solution is to move the backup and restore process away from VMs and to a storage area network (SAN) with serverless backup products such as VMware Consolidated Backup (VCB). Serverless backup requires RDMs to SAN LUNs to allow the backup server direct access to the LUN. But if a VM was created with defaults, you must re-create virtual disks and move data into RDM-configured storage to support a serverless backup architecture. This necessitates a major departure from default configurations for virtual environments.

Rating: 12345
Leave a comment

Note: all fields marked with (*) are required
Comments (0)
Close send to email window

Verification code

Already a member?
Blacklist monitoring alerts
sign up Signup for our real-time monitoring service and receive email notifications each time one of your IPs gets blacklisted.
Free Signup
Mail Server Operating System Poll

What OS do you use for your email server?
disabled next

How many mailboxes do you currently manage?
previous next

Would you like to comment upon the choosing of this particular OS?

DNS Tools
Get IP status, owner and location, obtain its corresponding hostname or check specific ports.
Ping Statistics
Reverse DNS Lookup
Whois Info (IP owner)
GeoIP Information
Check Port
Open Relay Test
Test if your mail server is an open relay for spammers.
Blacklist Checker
Check if your IP is listed in DNS based email blacklists (DNSBL)