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Individual Progress
Q.
- So what is disk mirroring, and what does it have to do with
backing up?
A.
- Disk mirroring replaces all writes to a single logical
device to multiple devices with distributing read operations. This
produces redundancy of data in the event of failure.
This is colsely
related to online backup systems since multiple copies of data are
stored on diferent devices.
Q.
- Why is there a need for doing this over the network, wouldn't
this be easier localy?
A.
- Yes, this can be much easly done on a local machine. There
already exist several different disk mirroring packages which are
local disk mirroring sustems. One product called Online:DiskSuite is
developed and supported by Sun
Microsystems, Inc. The problem with local disk mirroring is
inability of self recovery after major hardware failure, CPU failure
for example. Self recovery is posible if mirrored disks are attached
to different CPU's. The same holds true if this system is used as a
backup system.
Let us know what you think
about this projact.
