Dear developer,
There is a slip of the pen in last letter.
To avoid you misunderstand what I describe.
Here is my correction..
在 2011年5月6日下午2:39，doki74216@xxxxxxxxx <doki74216@xxxxxxxxx> 寫道：
> Dear Ceph,
> I am trying changing the weight of OSDs.
> My testing environment is one MON , one MDS and two OSDs(named OSD9 and OSD10).
> There are 4 disk foe each server host.
^^^^ not foe, I correct is as "for"
> In each OSD host, I running one cosd process per disk.
> Therefore, there are 4 cosd processes in OSD9 and OSD10 separetly.
^^^^^ not 4 , I correct it as "3". There
are one disk for OS system and 3 disk for osd.
> I named the cosd processes as osd24 osd25 and osd26 in OSD9.
> I also named the cosd processes as osd27 osd28 and osd29 in OSD10.
>
> My testing steps as shown below, if there is any wrong please correct
> me as far as possible. Thank you.
>
> 1) I want to compare the size of the folder whose weight is changed
> before and after.
> So I record the size of the folder before the weight of osd is changed .
> I excute"du /mnt/ext4/osd24/current/"
> ...
> ...
> "du /mnt/ext4/osd29/current/"
> 2) I edit the /tmp/crushmap.txt. Here is the txt.
> ====================================
> domain dom8 {
> id -9 # do not change unnecessarily
> alg uniform # do not change bucket size (3) unnecessarily
> hash 0 # rjenkins1
> item device24 weight 1.000 pos 0
> item device25 weight 1.000 pos 1
> item device26 weight 1.000 pos 2
> }
> domain dom9 {
> id -10 # do not change unnecessarily
> alg uniform # do not change bucket size (3) unnecessarily
> hash 0 # rjenkins1
> item device27 weight 1.000 pos 0
> item device28 weight 1.000 pos 1
> item device29 weight 3.000 pos 2
> ^^^^^^^^
> I replace 1.000 with 3.000 .
> ======================================
> 3) I execute "crushtool -c /tmp/crushmap.txt -o /tmp/crushmap_new"and"
> ceph osd setcrushmap -i /tmp/crushmap_new"
> 4) I thought the crushmap has already changed.
> If I write data, the data will more prbable placed in osd29 . right?
> When I excute" time dd if=/dev/zero
> of=/mnt/ceph/reweight_64k_64M_1.dbf bs=64k count=1024 oflag=dsync"
> I check the folder size by excuting "/mnt/ext4/osd24/current/"....
> "/mnt/ext4/osd29/current/".
> I found that the folder size is not growed in accordance with the
> wight I edit (osd24 osd25 osd26 osd27 osd28 weight=>1.000, osd29
> weight=>3.000).
> Here is the increasing folder size.
> In OSD9
> ? osd24 4124 kB
> ? osd25 28748 kB
> ? osd26 34064 kB
> In OSD10
> ? osd27 4124 kB
> ? osd28 28748 kB
> ? osd29 34060 kB
> ^^^^^^^^^^^^^^^^^^
> Why the folder size is not growed in accordance with
> the wight I edit ?
>
>
> If I want to change the weight of osd . Are the steps I mentioned above correct?
> Do you have any good idea or advice to our test? I really want to know
> how to change the weight of osd and how to verify it.
> Thank you very much...^^
>
> Stefanie Chen
>
Please helping me to solve this problem.
I appreciate it.
Stefanie Chen
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