In Reply to: Sorry folks....unplanned downtime posted by Rod M on May 11, 2007 at 06:20:31:
Just curious.... what is the capacity of each RAID disk? How many in the array? Thanks for bringing AA back up before the planned migration.Just a bit of techie trivia:
RAID 5 uses distributed parity data across the disks and can survive a single disk failure. Although you can tolerate one bad disk in a RAID 5 group, your data is vulnerable while that disk is bad.... In other words, if a second disk should go bad before the first bad disk is replaced (or automatically hot swapped if you have a hot spare in the array) and rebuilt, you're toast.
And with HUGE capacity disks, it can take the RAID array FOREVER to rebuild the replacement disk in the RAID group.... all the while your data is vulnerable until the replacement disk is rebuilt. This is the price you pay with HUGE capacity disks in the RAID group.
To help solve this problem, RAID 6 is becoming more popular. RAID 6 can sustain two disk failures in the RAID group and not lose data. It uses a second distributed parity scheme across the disks.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RAID Array ? - AbeCollins 07:40:24 05/11/07 (16)
- Re: RAID Array ? - Rod M 08:49:45 05/11/07 (15)
- As disk densities go up... - Nicholas Renter 10:55:22 05/11/07 (1)
- Re: As disk densities go up... - Rod M 16:57:50 05/11/07 (0)
- As another computer geek - E-Stat 09:39:34 05/11/07 (6)
- You lost me, but maybe not. ;-) - AbeCollins 12:08:15 05/11/07 (1)
- Sure it is - E-Stat 12:36:23 05/11/07 (0)
- Re: As another computer geek - Rod M 10:07:42 05/11/07 (3)
- You could easily go RAID 10 - E-Stat 10:39:56 05/11/07 (2)
- Re: You could easily go RAID 10 - Rod M 18:13:20 05/11/07 (1)
- Sure they do - E-Stat 21:17:54 05/11/07 (0)
- Re: RAID Array ? - AbeCollins 09:37:49 05/11/07 (5)
- Re: RAID Array ? - Rod M 10:03:18 05/11/07 (4)
- Update the firmware - nickwh 15:13:27 05/12/07 (0)
- A RAID recommendation - David W. Robinson 12:27:00 05/11/07 (1)
- Re: A RAID recommendation - Rod M 14:53:43 05/11/07 (0)
- Look to the RAID controller - J.Mac 10:32:06 05/11/07 (0)