Tinker, what you basically try to describe as Fletcher is kind of how
ZFS is working. The Fletcher on the other hand is simple checksumming
algorithm. Please read something about ZFS design to know more about
it.
Now, what I did for RAID1 to become RAID1C is just to divide data area
of RAID1 to dat
Sorry for the spam - this is my last post before your next response.
My best understanding is that within your RAID1C, Fletcher could work as
a "CRC32 on steroids", because it would not only detect error when
reading sectors/blocks that are broken because they contain
inadvertently moved data,
Wait, so you say the input for your CRC32 checksum is "metadata>".
So every sector/block in your model contains a CRC32 checksum of that,
and on every fread() you check that.
Does the SR metadata contain the sector index number, so that if the
sector index number would have changed inadverten
Just to illustrate the case. This is just how I got that it works,
please pardon the amateur level on algorithm details here.
With the Fletcher checksumming, say that you have the Fletcher checksum
in a tree structure of two levels: One at the disk root, one for every
100MB of data on the disk
Hi Karel,
Glad to talk to you.
Why the extra IO expense?
About the Fletcher vs not Fletcher thing, can you please explain to me
what happens in a setup where I have one single disk with one single
RAID partition on it using your disciple, and..
1) I write a sector/block on some position X
I don't know about fletcher, but I'm working on crc32 based
checksumming for soft raid1. The basic implementation is ready but I'm
not satisfied with write performance in some cases: small files, lots
of collisions in chksumming blocks etc. Worst case I see 6-7x slower
performance here in compariso
On 2015-12-02 02:27, Chris Cappuccio wrote:
Tinker [ti...@openmailbox.org] wrote:
Hi!
I heard someone was working with implementing Fletcher checksums in
softraid.
Do you know any updates on this?
Karel Gardas was working on an implementation of RAID1C for softraid
Last I remember, it need
Tinker [ti...@openmailbox.org] wrote:
> Hi!
>
> I heard someone was working with implementing Fletcher checksums in
> softraid.
>
> Do you know any updates on this?
>
Karel Gardas was working on an implementation of RAID1C for softraid
Last I remember, it needs to be pulled out into smaller pi
Hi!
I heard someone was working with implementing Fletcher checksums in
softraid.
Do you know any updates on this?
Fletcher checksums are how OpenBSD would guarantee that the data you
read from disk actually has integrity. What makes Fletcher checksums
different from traditional checksumm
Hi!
I heard someone was working with implementing Fletcher checksums in
softraid.
Do you know any updates on this?
Fletcher checksums are how OpenBSD would guarantee that the data you
read from disk actually has integrity. What makes it different from
traditional checksumming is that it n
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