![]() ![]() OS – Pick – Linux / FreeBSD / OpenSolaris.4 x Intel 1000 PCIx Lan cards (bond them together).2 x RAID PCIe / PCIx RAID hardware controller.Server chassis with redundant power supplies.Here is another example from one of our DR site server (this box mirrors our 30+ production server files and database): This will give the best performance for database server. ![]() #Softraid overhead cpu software#set up 4 mirror pairs, 2 on each hardware RAID controller, and use software RAID0 to put it all together. Sometime you need to use both hardware and software RAID to get the best of both worlds. There is an old saying in IT – no one ever got fired for picking RAID controllers. There is no vendor lock in with software RAID solution. With software RAID you can swap the drives to a different server and read the data. You can not do something like this with hardware RAID cards. Software RAID allows you to mix different drive and sizes. A good backup can save from RAID hardware incompatibility problems. ![]() However, sometime finding out exact hardware RAID requirements can be a nightmare. My personal experience – recovering from software RAID is easy. This make sure you gets back your data when one of your RAID card dies out. Combine them together to protect your data. Another option is to use two or three RAID cards. Use tapes and other servers that can hold copies of the data, but don’t allow much interaction with it. The entire RAID array can fail taking down all your data (yes hardware RAID card do dies). With today’s faster CPUs, software RAID outperforms hardware RAID. The performance of a software-based array is dependent on the server CPU performance and load. +Do you want the highest performance possible? +Do you run a mission critical cluster or setup? +Perfect for home and small business users. Use tools such as rsync, rsnapshot, tar, dump, restore and others to make daily backups. Daily scheduled and off site backups of your system are highly recommended. Hardware RAID with BBU may offers faster rebuilds as compare to software based solution.īoth software and hardware RAID cannot protect you against human errors or system failures or viruses. Hardware RAID with BBU may offers higher write throughput. Vendor lock in (open formats): See above. You can move, mix and match different sizes with open source software RAID. It means more people can fix problems as compare to a closed source hardware firmware. #Softraid overhead cpu drivers#*BSD / OpenSolaris and Linux RAID software drivers are open source. However, LILO and FreeBSD loader can get around this problem too. This can result into unexpected errors and data loss. It is hard to make fail over with software RAID if /boot fails while booting the server. Many RAID controller supports disk hot swapping.Ī hard disk is physically installed in the array which stays inactive until an active drive fails, when the system automatically replaces the failed drive with the spare, rebuilding the array with the spare hard disk included. It means replacing hard disk without shutting down the server. The more hard drives means more CPU cycle will go to software RAID instead of your Apache / Postfix or MySQL server. The software RAID must use server’s CPU and RAM for RAID software. The performance of a software-based array is dependent on the server CPU performance and current load. However, performance goes down when you use parity-based arrays and/or several arrays at the same time. With the software based RAID0 and RAID1 performance is negligible. With BBU pending writes are not lost on a power failure. Hardware RAID can run in write-back mode if it has a BBU installed. The software RAID works on partition level and it can sometime increase complexity if you mix different partitions and hardware RAID. Software RAID is part of OS, so no need to spend extract money. Comparison: Hardware vs Software RAID Feature In this post I will document my experience with both software and hardware RAID. But the real question is whether you should use a hardware RAID solution or a software RAID solution. A RAID can be deployed using both software and hardware. It is used to improve disk I/O (performance) and reliability of your server or workstation. Posted By Irfad - Software Vs Hardware RAIDĪ redundant array of inexpensive disks (RAID) allows high levels of storage reliability. ![]()
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