After playing with Head YOUTEK IG Extreme Pro almost 3 weeks, I’ve decided it’s time for me to get an extra stick for spare in case my 1st one broke as Head YOUTEK IG Extreme Pro is famous for eating strings.
It came to my attention someone has posted a 99.9% new IG Extreme Pro in a local tennis forum, so I contacted the seller directly and bought it without hesitation at almost 30% off the original price.
One of the most important reasons is because I do need an original Grip 3 IG Extreme Pro.
Originally I was thinking selling the original Grip 2 at the same tennis forum, and there was actually a NO Brain approached me asking for 50% off, then I found out it’s very easy to change the grip to a Grip 3 at a pro-shop, even better, I simply put an over grip on the of the Grip 2 solved the problem with $40.
After receiving the racket, I couldn’t be happier, as I found out it’s almost new, even newer than my 1st one, absolutely no scratch on the bumper that makes me wonder if the previous owner actually went to court and hit the balls.
Then it’s the perfect Grip 3, I can feel it’s even a bit smaller than my DIY Grip 3.
Anyway, I do hope the pair will last for a long long time, probably another 20 years just like my beloved POG. Well, it may not be a good news for local pro-shop though.
![IMG_5117 IMG_5117](http://www.modelcar.hk/wp-content/uploads/2011/10/IMG_5117.jpg)
I’ve asked Equallogic Support the following question today, it turns out I had wrong understanding about RAID10 before.
Client enviornment is running VMWare using EQL PS6000XV, 16 15K RPM disks (ie, 14 disks + 2 hot-spares)
In RAID10, there are 7 spindles as RAID10 only ultilizes half the disks, so there are only 7 spindles producing the atual IOPS.
In RAID50, all 14 spindles are used.
I/O pattern is mostly random (30% Read, 70% Write)
Does this mean in this case RAID50 is faster than RAID10 in terms of IOPS as there are 14 spindles in RAID50 compares to 7 spindles RAID10?
Reply from Equallogic’s US Support
The thing to remember here is that with RAID10 it will make two writes, one to each disk.
With RAID50, it will need to make the read/write/parity to all of the member disks in the raidset.
With Read/Write sequential IO, the difference would be minimal. With an environment as you described (virtual environment) where there are many small random I/Os, RAID10 will be quicker.
RAID10 will also be quicker if a drive fails whereas the performance with RAID5/50 is poor when the raidset is degraded and a rebuild is going on.
And of course, the space issue when considering RAID10 or RAID50 is a huge consideration
Then, I got an even better answer from a Dell storage expert in Hong Kong
![image00194 image00194](http://www.modelcar.hk/wp-content/uploads/2011/10/image00194.png)
Actually spindle in RAID10 is still 14, not 7; 7 is the capacity oriented view. We still consider using all disks during I/O.
But you may notice that above chart didn’t mention for Read performance? And yes, read performance for RAID 10 and RAID 50 or even RAID-5 will almost the same! The different will mainly focus on write.
RAID 50 is two RAID-5 and stripe, the RAID parity overhead will still exist across the disks; the more disks you have in the RAID group, the more overhead and performance penalty you have!
In RAID 10, every RAID group consists with two disks only, so overhead and performance penalty is minimum.
這次用了整個星期做研究﹐閱覽過無數網站﹐只挑最經典的和最好看的收。集中火力70年和71年這段﹐最後終于在美國和加拿大找齊了我所有的最喜愛款式。
最後發現各款的黑色還真難找﹐想不到老外對黑色的肌肉車特別情有獨鍾﹐另外郵費貴得完全不想提了。
大功告成﹗YEAH﹗
1/18 Highway61 (H50656) Dodge Challenger R/T Black 440 with Magnum 500 Wheels 1970
![1970 Challenger 1970 Challenger](http://www.modelcar.hk/wp-content/uploads/2011/10/1970-Challenger.jpg)
1/18 Highway61 (H50654) Dodge Challenger R/T 426 Hemi Black 1970 (Limited 600)
![1970-DODGE 1970-DODGE](http://www.modelcar.hk/wp-content/uploads/2011/10/1970-DODGE.jpg)
1/18 Highway61 (H50601) Dodge Challenger R/T SubLime Green 440 1970
![Dodge Challenger Dodge Challenger](http://www.modelcar.hk/wp-content/uploads/2011/10/Dodge-Challenger.jpg)
1/18 Highway61 (H50691) Dodge Challenger R/T Hemi Orange 440 1971 (Limited 504)
![1971 50691 1971 50691](http://www.modelcar.hk/wp-content/uploads/2011/10/1971-50691.jpg)
1/18 Highway61 (H50784) Dodge Challenger T/A M3 Panther Pink 340 1970 (Limited 500)
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1/18 GMP (GMP1803120) Plymouth SR70 GTX Black Bird Street Fighter 1970 (Limited 500)
![Blk Bird Blk Bird](http://www.modelcar.hk/wp-content/uploads/2011/10/Blk-Bird.jpg)