Hi, On 23/11/2007, Jan Catrysse <[EMAIL PROTECTED]> wrote: > > From: Bill Moran [mailto:[EMAIL PROTECTED] > > Sent: Thursday, November 22, 2007 9:57 PM > > To: Jan Catrysse > > Cc: email@example.com > > Subject: Re: RAID1 synchronisation - howto OR not necessary? > > > > "Jan Catrysse" <[EMAIL PROTECTED]> wrote: > > > [...] > This is what I found in a 3Ware manual: > Verification can provide early warning of a disk drive problem or failure. [...] Yes, it deals with drives failing silently. It's possible that data on a disk can get corrupted. You don't see the error until you read the block the next time. AFAIK the data contained in the bad block is delivered to the CPU/RAM and can cause some damage there. The problem I see with this setup is that you can't know which block is the one that is okay. You need some additional feature like a checksum for each block to check which one is correct. This isn't supported by all file systems, so you can only see that there is a difference between two blocks which sould normally be identical.
I doubt that cheep RAID-Controllers have this capability, so you have to stick to some software solution. Does FreeBSD take care about something like this, I mean for software RAIDs? Regards Christian _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"