Linked by Thom Holwerda on Mon 18th Jan 2010 16:57 UTC, submitted by wanker90210
Hardware, Embedded Systems ACM's latest journal had an interesting article about RAID which suggested it might be time for triple parity raid. "How much longer will current RAID techniques persevere? The RAID levels were codified in the late 1980s; double-parity RAID, known as RAID-6, is the current standard for high-availability, space-efficient storage. The incredible growth of hard-drive capacities, however, could impose serious limitations on the reliability even of RAID-6 systems. Recent trends in hard drives show that triple-parity RAID must soon become pervasive."
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RE[4]: RAID Z
by garyd on Tue 19th Jan 2010 17:05 UTC in reply to "RE[3]: RAID Z"
garyd
Member since:
2008-10-22

As I said in another post, if I can take a soft-RAID5 array (E.g. on-board controllers) that was built under Windows and move it to Linux and back, its standard.


Yes, but that's only if you use a file system that both operating systems can read and the controller is recognized by both operating systems. It's only possible because the controller abstracts the array in to a logical volume that the PC can see -- not because it's a "standard" RAID configuration. The user land portion of the operating systems doesn't care about anything but the file system. The OS kernel and drivers take care of the hardware abstraction layer so if both platforms don't have drivers for your controller's chipset or can't read the file system format then you're out of luck. I don't see how any of this makes portability between operating systems easier merely because you chose a RAID. I could use fibre channel or iSCSI to mount a volume on either OS, too, but that's also accomplished via drivers and file system support as the OS still doesn't care anything about how the disks are organized by the storage manager.

Reply Parent Score: 1

RE[5]: RAID Z
by gilboa on Tue 19th Jan 2010 17:48 in reply to "RE[4]: RAID Z"
gilboa Member since:
2005-07-06

... We're past that stage.
I already admitted that using the word "standard" in the context of RAID was a mistake.

Can we move along?

Reply Parent Score: 2

RE[6]: RAID Z
by garyd on Tue 19th Jan 2010 18:28 in reply to "RE[5]: RAID Z"
garyd Member since:
2008-10-22

Can we move along?


By all means. It would be helpful if there were an option here to see a threaded view of conversations.

Reply Parent Score: 1