On 1/13/07, roland <[EMAIL PROTECTED]> wrote:
i have come across an interesting article at :
http://www.anandtech.com/IT/showdoc.aspx?i=2859&p=5
it`s about sata vs. sas/scsi realiability , telling that typical desktop sata
drives
".....on average experience an Unrecoverable Error every 12.5 terabytes written or
read (EUR of 1 in 1014 bits)."
since the 1TB drive is out very soon, this really makes me afraid of data
integrity on my backup disks, so the question is:
will zfs help detect/prevent such single-bit errors ?
zfs will detect a single bit error, if you are using raid either
raidz or mirroring it will fix the error.
i`m somewhat sure, that it will help if i use raid1 setup with ZFS - it`s self
healing will detect those single-bit-errors and correct this - but what about
single disk setup ?
if you aren't using mirroring or raidz the error will be detected but
won't be repaired. with the possible exception of metablocks that hold
information about the files and disk structures there are multiple
copy of these, and they can be used should the error occur in one of
those blocks.
can zfs protect my data from such single-bit-errors with a single drive ?
nope.. but it can tell you that it has occurred.
James Dickens
uadmin.blogspot.com
regards
roland
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