Try this at home only if you
understand the implications (one dead drive means one dead PC).
RAID 1
Usually referred to simply as mirroring, RAID 1 is designed to protect a single drive
against failure. Two drives are configured to appear as one array. All data written to the
primary drive is also written to the mirror drive, as shown in Figure 10-4. If the primary
drive should fail at any point, the secondary drive will take over and become the primary.
Depending on the type of RAID controller involved, failover could be nearly transparent,
require a reboot with no reconfiguration, or require a reboot with administrator intervention.
RAID 1 always consists of two distinct drives??”no more, no less. Because there is
only a single drive, there is a ceiling to the speed capabilities of this RAID level. However,
speed is not important??”data protection is.
CHAPTER 10 n HARDWARE CONSIDERATIONS 249
Figure 10-4. RAID 1 offers pretty solid protection against data loss, but is not so fast or
efficient when it comes to maximizing space usage.
RAID 5
When dealing with RAID 0, there is clearly no protection against drive failure.
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