Ghost Chili. Pure Capsaicin. Gary D Williams This person is a verified professional. Verify your account to enable IT peers to see that you are a professional. I dont see that used in day to day setups at all. I think you may need to understand that the 2 terms have slightly different meanings Single Raid controller with mirrored disc's of the OS partition.
Mike This person is a verified professional. By definition, everyone using RAID 1 is using mirroring. Two terms for the same thing. You see it commonly in software RAID setups, but not intentionally, it just happens. Actually its not Then another hardware was used to duplex the whole LUN setup. This topic has been locked by an administrator and is no longer open for commenting. If this factor is very low, constant data cloning becomes an inefficient process.
Many vendors have accepted this approach which allows the hardware to take advantage of intelligent software routines. Operating systems do not differentiate between hardware and software mirroring methods; they read from or write into a device via the device's controller unit. Intelligent controllers can then decide the most efficient method through which to read or write the data. It is important to note that on mirrored disks read operations are typically faster and write operations slower than non- mirrored disks.
Another known technique is called Lazy Writes. In order to optimize the read performance some drivers conduct a process commonly known as sector mapping. This process is based on the idea that the less likely a disk write places both heads in similar locations on two mirrored disk, the more efficient the read operation. There is a top number of retries associated with the ECC which prevents the endless -dead loop- read attempts to a disk; instead, it seeks to collect the correct data from the mirrored device.
HOT FIX process involves copying the error-free data into the original disk and then marking its bad sectors. In order to recover the bad sectors, low-level formats are required. For most practical purposes, this conservative approach preserves system resources and guarantees data integrity. Different drivers choose various warning methods when a serious error occurs. Some drivers display a message on the system console. Others, may take a less verbose approach by activating a hardware switch, such as LED signals.
Disk mirroring has become a fact of life in fault-tolerant networked environ- ments. There are many popular software and hardware approaches to this issue.
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