Wednesday Jan 06, 2010

ZFS resliver performance improved!

I'm not being lucky with the Western Digital 1Tb disks in my home server.

That is to say I'm extremely pleased I have ZFS as both have now failed and in doing so corrupted data which ZFS has detected (although the users detected the problem first as the performance of the drive became so poor).One of the biggest irritations about replacing drives, apart from having to shut the system down as I don't have hot swap hardware is waiting for the pool to resliver. Previously this has taken in excess of 24 hours to do.

However yesterday's resilver was after I had upgraded to build 130 which has some improvements to the resilver code:

: pearson FSS 1 $; zpool status tank
  pool: tank
 state: ONLINE
status: The pool is formatted using an older on-disk format.  The pool can
        still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'.  Once this is done, the
        pool will no longer be accessible on older software versions.
 scrub: resilver completed after 6h28m with 0 errors on Wed Jan  6 02:04:17 2010

        NAME           STATE     READ WRITE CKSUM
        tank           ONLINE       0     0     0
          mirror-0     ONLINE       0     0     0
            c21t0d0s7  ONLINE       0     0     0
            c20t1d0s7  ONLINE       0     0     0
          mirror-1     ONLINE       0     0     0
            c21t1d0    ONLINE       0     0     0  225G resilvered
            c20t0d0    ONLINE       0     0     0

errors: No known data errors
: pearson FSS 2 $; 
Only 6 ½ hours for 225G which while not close to the theoretical maximum is way better than 24 hours and the system was usable while this was going on.

Sunday May 11, 2008

May Flyer

Once again we, Molesey BBT, rode the South Western Road Club's May ride. This year is was called the “May Flyer” the route was identical to last year but the weather was not. Today was glorious sunshine. We started off as a group but one immediately, that is within 10 yards of the start, punctured and the rest of us pushed on. By the time I got over Coombe Bottom all the other BBT riders were no where to be seen. One rider I know from the trips to Italy and France was with me and a few others I did not know. We pushed on.

After about 22 miles we were caught by three riders who had started 3 or 6 minutes behind us and so were clearly going faster than us. I decided to try and catch a wheel and see how far I could hold it for. One of the riders had blistering speed on the “flatter” sections the second I later discovered was doing the ride on the big ring and could clearly have left us all standing. The third seemed like a very good all rounder.

I managed to stay with them until the return climb up Coombe Bottom where the “all rounder” was dropped but the rider on the big ring disappeared. I was only 10 yards off the other rider at the top but He was on a mission and the drop from there to the finish suited his style being able do a fast pace.

My GPS told me I completed the ride in 4:54 for the 86.24miles giving 17.6mph.

Finally on the way home I got to be bicycle repair man to a random Lady whose chain had come off. The whole day was 104 miles and my legs certainly feel that I have had a good workout. I do really need to find out what the problem is with my right foot which became extremely painful during the ride. I was wearing my Sidi shoes. I'll try the Carnacs for a few weeks to see if that makes it better.

Friday Jun 08, 2007

South Western Road Club May Cyclosportif - results

I got the results through for the South Western Road Club Cycle sportif, which is not a race but since they publish times you can see how well you did compared to others. I came in ninth, (fifth for my age group) which I find amazing:

9 05:03 Gerhard Chris E 05:03 GOLD

I've now forgotten the rain and how horrible the day was.

Sunday May 13, 2007

South Western Road Club May Cyclosportif

This years South Western Road Club Randonee has been renamed a Cyclosportif. I'm not sure why as this years event was practically indistinguishable from last, except that it ended in Ripley where there is hall and that it rained for the entire ride.

A group of us from Molesey BBT left together at 09:09 but almost immediately we were split up with just two of use off the front and we did not stay together for long. By the time I reached Albury I was on my own but feeling good catching riders from earlier groups. Then in Wonersh I was passed by three riders and managed to grab a wheel. This could have ended in tears as they were pushing on and just outside Godalming the rider just in front of me went down on a left hand bend. How I missed him and his bike and managed to stay upright I don't know. He and his bike were fine. It certainly did not stop them pushing along however he was more circumspect on the bends from then on.

I managed to stay with them until the halfway check near Amberley but while we were getting our cards signed the faller managed to escape of the front so there where then just three of us. However it was clear to me that I was never going to be able to stay the distance with them. Then one of them punctured and I was alone briefly before I joined up with another group. Then we passed the faller who had also punctured, there were lots of riders puncturing. I must have past at least 10, each one making me think it was only a matter of time before I joined them. I did not see them pass me but they may have when I stopped to tighten the screws that hold my water bottle cage on which had worked loose.

>By the time I reached the third checkpoint I was leading a small group and on leaving I was on my own. I wanted to be alone as I climbed Coombe Bottom so no one would know just how slow someone could go up a hill. I failed. Got caught.

Managed to ride the last few miles to Ripley as a pair and since it was down hill it did not feel quite as slow as it could have. Also the rain had eased a bit. I finished at 14:13 approximately which is a disappointing time 5 hours 2 minutes to do 90miles. I have plenty of excuses though.

Not really sure how far it was by the end as once again my speedometer stopped working for part of the ride. I measured the distance as 83 miles and have 104 for the day with an average of 18mph when I finished and 17.8mph when I got home.

I was completely soaked but overall I enjoyed it.


This is the old blog of Chris Gerhard. It has mostly moved to


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