Re: Are linux-fs's drive-fault-tolerant by concept?

Chuck Ebbert (76306.1226@compuserve.com)
Sun, 20 Apr 2003 11:06:20 -0400


Alan Cox wrote:

> Buy IDE disks in pairs use md1, and remember to continually send the
> hosed ones back to the vendor/shop (and if they keep appearing DOA to
> your local trading standards/fair trading type bodies).

I buy three drives at a time so I have a matching spare, because AFAIC
you shouldn't be doing RAID on unmatched drives.

Using RAID1 is especially important when using software instead
of hardware for fault-tolerance because the software is more likely to
have bugs just because of the 'culture' of hardware vs. software
developers, and the RAID5 algorithm is very hard to get right anyway,
especially in failure/rebuild mode. Even on a hardware controller
RAID5 is still inherently less reliable.

(...and what's all this about unreliable drives, anyway? Every drive
I have bought since 1987 still works.)
------
Chuck
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/