Greg Byshenk wrote:

On Sun, Aug 20, 2006 at 07:51:29PM +0200, Miroslav Lachman wrote:

Greg Byshenk wrote:

[...]

This happened four times (with the same errors that have been discussed
here), running 6.1 STABLE as of June 22.  Before attempting to RMA the
drives, I tried an updated kernel, 6.1 STABLE as of July 19.  Strangely
enough, the problems disappeared.


So, while I have not checked everything that has changed, it _might_ be
worth trying 6.1 STABLE...

I have problems with 6.1-RELEASE same as with 6.1-STABLE from August 2. I can try newer STABLE, but as I see on cvsweb, there are not much changes in ATA driver sources, only new chipsets added.


It is only an idea, based on something that worked for me.  And, as I
said, my situation is not exactly the same as the others.

It is strange to me, that I can see significant changes of read/write speed. (I am running nonstop tests with writing disk full of files, delete them, and start again + generating graphs) Speed vary from 2.5MB/s to 11MB/s by jumps. Not continuous from the lowest to the highest. Writing is for example 3MB/s for 20 hours, then jump to 10MB/s and after some time (6 - 20 hours) jump down to about 3MB/s. After some days of testing, disk disappear, system reboots itself, resynchronize gmirror and work for next few days till the next disk lose. Also earlier synchronization was done after 1:30 hour (at about 30MB/s), now synchronization run at lower speeds - from 2.5MB/s to 15MB/s, so the whole synchronization is done after more then 5 hours (the longest was 20 hours to synchronize 250GB HDDs)


I don't know what more can I test, what more could be done to solve these problems. :(


You are using gmirror, which I am not, so the situations are not
analogous, since my situation was with h/w RAID.  And I have no direct
experience with gmirror (I use gvinum on a couple of secondary systems,
but those are SCSI based).

Does the output of 'systat -vm' tell you anything of interest?  That is,
are the disks running at or close to 100%, are the CPUs fully loaded, or
anything else...?

There is nothing interesting in systat / gstat / top or anything else.
System is almost idle, just running test script for disk writing. Speed problems is not dependent on gmirror. I deactivated gmirror on second machine and run test on normaly mounted filesystems with same low speeds ;(

This is systat from gmirrored system running test:

    4 users    Load  0.01  0.02  0.00                  Aug 20 21:06

Mem:KB    REAL            VIRTUAL                     VN PAGER  SWAP PAGER
        Tot   Share      Tot    Share    Free         in  out     in  out
Act  124144    9580   897616    27168   43016 count
All 1016728   75888364464876   210508         pages
                                                                 Interrupts
Proc:r  p  d  s  w    Csw  Trp  Sys  Int  Sof  Flt        cow    4144 total
7 75 979 4 155 288 27 161484 wire 1: atkb 191292 act 14: ata 0.4%Sys 0.0%Intr 0.0%User 0.0%Nice 99.6%Idl 624272 inact 11 16: bge | | | | | | | | | | 41360 cache 133 19: ata 1656 free 2000 cpu0: time daefr 2000 cpu1: time
Namei         Name-cache    Dir-cache                     prcfr
    Calls     hits    %     hits    %                     react
        6        6  100                                   pdwake
                                          zfod       1354 pdpgs
Disks   ad4   ad6                         ozfod           intrn
KB/t    125   126                         %slo-z   113888 buf
tps      34    33                    1407 tfree        17 dirtybuf
MB/s   4.13  4.10                                   69977 desiredvnodes
% busy   54    48                                   20661 numvnodes
                                                    17286 freevnodes

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