RAID – Redundant Array of Inexpensive Discs – technology thanks to which the reliability and efficiency of disk storage increases compared to traditional single-disk solutions.
They all have their strengths and weaknesses sides. Applied by depending on the needs and budget of the users.
Unfortunately, these solutions are not fully reliable. For example RAID5 will ensure the continuity of work and the possibility of rebuilding in event of failure of one from all drives, but when two are damaged, unfortunately not.
It should also be remembered that apart from damage to the drives or controllers themselves, there may be problems with the consistency of the data itself resulting from logical failures.
NAS servers (Network Attached Storage) and SAN (Storage Area Network) are devices commonly referred to in the IT industry as home or business clouds.
These servers have recently become more and more popular, mainly due to the supervision we can exercise over them and being aware that we do not send private data to public clouds.
The most popular devices are are versions with space for two hard drives with RAID level 1 i.e. the so-called mirror.
The cause of data loss, which we deal with most often in such configurations, is the use of two twin drives bought both in the same place and time which results in damage to both media in a short period of time due to the possible manufacturing defects.
When choosing a two-drive configuration based on RAID 1, always buy drives at a different time or place, or a different model or manufacturer. We minimize in this way the risk of manufacturing defects.