Disk reliability (Was: Node cloning)
xyzzy at speakeasy.org
Fri Apr 6 13:14:33 PDT 2001
On Fri, 6 Apr 2001, Josip Loncaric wrote:
> BTW, the nonrecoverable error rate of 7200rpm IDE drives is typically
> rated at 1 part in 10^13, so you have a decent chance of finding
> problems in a 1-2 TB disk farm (which contains about 10^13 bits).
When a drive block goes bad, the drive automatically remaps it to a spare
block. If you find bad blocks on a modern hard disk, something is wrong with
> > BTW you can "mkswap -c" to mark bad blocks in swap. I don't know why
> > you'd find a bad block in swap less acceptable than a bad block in the
> > filesystem.
> As far as I know, "mkswap -c" only checks and reports the count of bad
> blocks, just in case you'd like to be told. The man page does not say
> anything about *mapping* them out. My understanding is that swap gets
Sure it does, from mkswap(8):
The old setup wastes most of this bitmap page, because zero bits denote
bad blocks or blocks past the end of the swap space, and a simple
integer suffices to indicate the size of the swap space, while the bad
blocks, if any, can simply be listed.
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