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Phone-home capabilities. Your disk array may be smart enough to pick up the phone and call its manufacturer s support center when it detects that it has a problem. Many of these features have additional costs associated with them, and not all are available from all vendors.
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Software RAID
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Software RAID moves the disk management functions off of the disk array, allowing more flexibility in the choice of disk hardware. However, since the functions are performed on the host computer, additional load is added to that system. If parity RAID is involved, then significant CPU overhead will result. Regardless of the method employed, though, there will be some additional I/O, CPU, and memory load on the server. Disk management is often packaged with logical volume management for additional features. Just as the output of Hardware RAID operations is a LUN, as mentioned, the output of Software RAID operations is a volume. A volume is the object on which filesystems are written, or on which databases write their data. As we discussed earlier in the section entitled Six Independent Layers of Data Storage and Management, the filesystem and database don t care how a volume is organized. The following are advantages of Software RAID: Flexibility. You can mix and match vendor disk hardware. You can combine LUNs when one fills up. Your purchases are not locked to a single disk vendor who can charge what he wants for his disks; instead, you can shop around for the least expensive disks that meet your requirements. Removal of hardware limitations. You can mirror and stripe disks from different arrays into logical volumes, and resize and rearrange LUNs without restriction. Costs scale better. When buying additional disks, you are not limited to potentially expensive Hardware RAID capable hardware. Any disks, even JBODs, will do. Therefore, as a system s storage capacity grows, the additional storage hardware you need to purchase is much less expensive; it need not include the Hardware RAID intelligence. The biggest downside to Software RAID is reduced performance, but this does not occur in all cases. If you must do parity RAID, then it is probably best to do so with Hardware RAID. Writing in software-based RAID-5 is generally too slow for most high-volume, insert- or update-intensive production environments. When Software RAID-1 is used, the performance is generally fine for most applications.
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The other downside worth mentioning is that in order to bring Software RAID to a new operating system, its code must be ported. This can delay the availability of such products on emerging operating systems or prevent their availability altogether.
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Logical Volume Management
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Software RAID is often just one feature of logical volume management (LVM) software. LVM offers many other features besides Software RAID. While each LVM product is different, here are some of the more useful features: Online reconfiguration. This feature includes the ability to add and remove mirrors, to expand and, in some cases, shrink a volume or filesystem, and rearrange the disk layout of data, and to do so without interrupting user service. Removal of OS-imposed limitations. For example, in Sun s Solaris operating system, a disk cannot be divided into more than seven slices. A good LVM would remove that restriction, allowing whatever slicing is desired. Hooks into system management tools. When the LVM detects failures or performance issues in monitored devices, the information should be automatically shared with system monitoring tools. The LVM might even offer suggestions on how to better layout data for improved performance. Hot sparing. If one disk fails, a dedicated spare disk can be automatically moved into its place, transparent to the users. Some commercial examples of LVMs are VERITAS Software s Volume Manager, which runs on Solaris, HP-UX, AIX, Windows, and Linux, and Sun s Solstice Disk Suite.
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