On 2012-12-11 16:44, Jim Klimov wrote:
For single-break-per-row tests based on hypotheses from P parities,
D data disks and R broken rows, we need to checksum P*(D^R) userdata
recombinations in order to determine that we can't recover the block.
A small maths correction: the formula above refle
On 2012-12-02 05:42, Jim Klimov wrote:
My plan is to dig out the needed sectors of the broken block from
each of the 6 disks and try any and all reasonable recombinations
of redundancy and data sectors to try and match the checksum - this
should be my definite answer on whether ZFS (of that oi151
On 2012-12-10 07:35, Timothy Coalson wrote:
The corrupted area looks like a series of "0xFC 0x42" bytes about
half a kilobyte long, followed by zero bytes to the end of sector.
Start of this area is not aligned to a multiple of 512 bytes.
Just a guess, but that might be how the sect
On Sun, Dec 9, 2012 at 1:27 PM, Jim Klimov wrote:
> In two of three cases, some of the sectors (in the range which
> mismatches the parity data) are not only clearly invalid, like
> being filled with long stretches of zeroes with other sectors
> being uniformly-looking binary data (results of com
more below...
On 2012-12-06 03:06, Jim Klimov wrote:
It also happens that on disks 1,2,3 the first row's sectors (d0, d2, d3)
are botched - ranges from 0x9C0 to 0xFFF (end of 4KB sector) are zeroes.
The neighboring blocks, located a few sectors away from this one, also
have compressed data and
more below...
On 2012-12-05 23:16, Timothy Coalson wrote:
On Tue, Dec 4, 2012 at 10:52 PM, Jim Klimov mailto:jimkli...@cos.ru>> wrote:
On 2012-12-03 18:23, Jim Klimov wrote:
On 2012-12-02 05:42, Jim Klimov wrote:
>> 4) Where are the redundancy algorithms specified? Is there
On 2012-12-05 05:52, Jim Klimov wrote:
For undersized allocations, i.e. of compressed data, it is possible
to see P-sizes not divisible by 4 (disks) in 4KB sectors, however,
some sectors do apparently get wasted because the A-size in the DVA
is divisible by 6*4KB. With columnar allocation of disk
On Tue, Dec 4, 2012 at 10:52 PM, Jim Klimov wrote:
> On 2012-12-03 18:23, Jim Klimov wrote:
>
>> On 2012-12-02 05:42, Jim Klimov wrote:
>>
>>>
>>> >> 4) Where are the redundancy algorithms specified? Is there any simple
> >> tool that would recombine a given algo-N redundancy sector with
> >>
On 2012-12-03 18:23, Jim Klimov wrote:
On 2012-12-02 05:42, Jim Klimov wrote:
So... here are some applied questions:
Well, I am ready to reply a few of my own questions now :)
Continuing the desecration of my deceased files' resting grounds...
2) Do I understand correctly that for the offs
On 2012-12-02 05:42, Jim Klimov wrote:
So... here are some applied questions:
Well, I am ready to reply a few of my own questions now :)
I've staged an experiment by taking a 128Kb block from that file
and appending it to a new file in a test dataset, where I changed
the compression settings b
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