Re:Still a single point of failure
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Basics of RAID
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· Score: 1
There is another 'single' point of failure - the power supply. You may think that having a RAID cache, which is battery backed up may prevent this, but what about the HDD cache - every disk has write cache turned on by default - it's how disks get good performance. So, if there is a power failure, data in the HDD cache will never make it to the disk and since the RAID cache gets an acknowledgement from the HDD cache - the 8MB disk cache data disappears!
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There is another 'single' point of failure - the power supply. You may think that having a RAID cache, which is battery backed up may prevent this, but what about the HDD cache - every disk has write cache turned on by default - it's how disks get good performance.
So, if there is a power failure, data in the HDD cache will never make it to the disk and since the RAID cache gets an acknowledgement from the HDD cache - the 8MB disk cache data disappears!