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RAID µð½ºÅ©´Â ÆÄÀÏ ±×µéÀÚ½ÅÀÌ »èÁ¦µÇ°Å³ª Ÿ¶ôµÉ ¶§¶óµµ RAID µð½ºÅ© Á¦¾î±â°¡ 2°³ÀÇ ºñÄ¡±â µð½ºÅ©¸¦ µ¿ÀÏÇÑ À¯ÁöÇϱ⠶§¹®¿¡, ¿©±â¿¡¼ µ½Áö ¾Ê´Â´Ù. À̰ÍÀº â ü°è º¹±¸°¡ ÂüÀ¸·Î ¾ÆÁÖ °æÆíÇÒ ¼ö ÀÖ´Â °÷ ÀÌ´Ù. ³ª´Â ÀÌÀü ³¯Â¥¿Í ½Ã°£¿¡ ü°è¸¦ º¹±¸Çؼ ÇØ°áµÈ ½É°¢ÇÑ ¹®Á¦À̶ó°í º¸ÀÎ ¸î ½Ã°£À» º¸³½´Ù. ü°è º¹±¸´Â ºÒ¸®°¡ ÀÖ´õ¶óµµ, ÀÛµ¿ÇÑ´Ù Àüü µå¶óÀÌºê ºñ·Ï ´ç½ÅÀÌ ´ÜÁö 1°³ÀÇ ÆÄÀÏÀ» Àç±âÇÒ Çʿ䰡 ÀÖ´õ¶óµµ, °ú°Å¿¡´Â ¼±Á¤ÇÑ ½Ã°£¿¡ º¹±ÍÇÑ´Ù.

±×·¯³ª ü°è º¹±¸°¡ ÇØ°áÃ¥ÀÌ ¾Æ´Ñ °æ¿ì¿¡, ¹é¾÷ ÀÀ´äÀº ÀÌ´Ù.
DVD¿Í ÀÎÅÍ³Ý ¹é¾÷Àº »ç¿ëÀÚ µ¥ÀÌÅ͸¦ º¹±¸Çϱâ À§ÇÏ¿© ÀÌ¿ëµÉ ¼ö Àִ°¡, ±×·¯³ª ü°èÀÇ ³ª¸ÓÁö ¸ðµÎ ´Â ¾î¶³±î¿ä? I started a full backup once, but quit when the backup wizard pointed out that I would need 19 DVDs. Enter ¡°RAID Backup¡± with a third identical disk drive. At some reasonable interval (every day, every week, every month) I can disconnect the power to one of the two mirrored disks and connect the third disk. The disconnected disk is instantly a complete backup of everything, and the newly-connected disk will soon be overwritten and re-mirrored to the remaining good disk in the RAID 1 pair. Voila - complete backup in about five minutes for a one-time cost of about $80. It does actually take about 2 hours and 15 minutes to re-mirror, but the system is usable, if slower, while that takes place. And the third disk, with no power, is safe from any mischief.
I wasn¡¯t entirely sure that the Intel software would be totally cool with what I wanted to do, but I tried it last night and today. The system has three identical 320 Mb Western Digital hard disk. Steps in the experiment:
- Disk Drives A and B were mirrored, drive C was powered up as a spare but had never been used.
- I shut down the computer, disconnected power on B, rebooted the computer. The Bios complained that the RAID 1 pair was ¡°degraded¡± and gave me a chance to deal with it in the Bios, but I declined and let the bootup proceed.
- The computer booted normally, and the Intel monitor software presented a pop-up balloon that said the RAID 1 disk was degraded but could be repaired.
- I clicked on the balloon and followed the instructions to restore disk C to mirror the good disk in the RAID pair, disk A. Two and a quarter hours later, A & C were a mirrored RAID pair and B was a complete backup. Job done.
- As an experiment, however, I shut down again and disconnected all EXCEPT disk B, then rebooted. Again the Bios complained and the on-line software did too, but the system functioned normally on just the ¡°backup¡± disk. As far as I could tell, all files were accessible. The RAID software, apparently confused, also created a second RAID array at this point, consisting of Disk B and a ¡°missing¡± disk. Duh.
- I rebooted with only A & C connected, and everything worked once again, no complaints.
- Then I connected B as well, rebooted, and got some complaints about a degraded pair in the second RAID array (disk B), but the system ran normally and all files on all disks seemed to be accessible, including the files on disk B.
- Finally, I disconnected disk C, leaving A & B connected, and rebooted once again. The Bios and the Intel application software both complained about degraded RAID arrays. But it allowed me to delete the second RAID array, consisting of only disk B. That done, it allowed me to re-mirror B to the good disk in the original RAID pair, disk A, even though disk B contained lots of valid data. I was concerned that it might not let me destroy data, and I think there were at least four warnings that data would be destroyed on disk B if I proceeded, but it finally let me do it. Now disk C is again the full backup and the system is back to a RAID array of disks A & B.
From now on the procedure will be much simpler: Shut down, disconnect B or C (whichever was connected), reconnect the disk that was disconnected, reboot, and tell the Intel application to restore the RAID array. The biggest hassle is moving the computer to a position where I can open the side panel and disconnect / reconnect drives. I can handle it.
Before these little experiments, the system¡¯s Windows Experience Index was 5.4, limited by the disk subscore of 5.4. I ran the tests several times. Since the experiments, the Windows Experience Index is 5.5, limited by both the processor and gaming graphics, with the disk subscore improving to 5.7. Why did the disk subscore go up from 5.4 to 5.7, using exactly the same disks? Only Microsoft knows.
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