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Full Discussion: How to know exactly which physical partion contains data?
Operating Systems AIX How to know exactly which physical partion contains data? Post 302929647 by bobochacha29 on Tuesday 23rd of December 2014 11:11:16 PM
Old 12-24-2014
Sorry for replying so late. It took me a few days to check the data I/O to do the migrate, and a few days more to check the result after the migration.

Quote:
This - the splitting you intend - makes sense only in a specific kind of situation, so please describe your hdisk-devices a bit better. What are they (single SCSI-disks, RAID-sets, LUNs from SAN, ...) and how do you access them?
They are SCSI Disk Drive.

Quote:
Further, please tell us which kind of data the FS holds. You already said "mostly writing log files", but a little more detail would help: many small files, a few very large files, do the files change often or are they mostly appended? How often are files deleted and recreated (like in log rotation)? How many processes write (typically) concurrently to the FS. It might be that you can gain a lot with different OS tuning parameters without even having to change the disk layout.
Yes, many small files and these small files are compressed to a tar file after each day. Depending on which kinds of log, these tar files are deleted after 1 week, 1 month or 1 years ...

This i's what I've done for the last few days. I used "lvmstat" to collect the information of I/O stat of each lp/pp of fslv00.
Code:
Log_part  mirror#  iocnt   Kb_read   Kb_wrtn      Kbps
       1       1  993851   1208612   3869488      3.01
       1       2  892710    595072   3869440      2.65
       2       1  494569   1453116   2206252      2.17
       3       1  484349   1480348   2106752      2.13
      94       1  480105   1716412   2667692      2.60
       4       1  441866   1397696   2095044      2.07
       2       2  401524    746264   2206260      1.75
      94       2  395993    994520   2667688      2.17
      66       1  394574   1960732   2910004      2.89
       3       2  385884    783876   2106748      1.71
      66       2  378052   1193540   2909996      2.43
      93       1  363708   1538244   2186696      2.21
       4       2  360660    762820   2095048      1.69
      27       1  359079   1828708   2038160      2.29
      11       1  312996   1613992   2138716      2.22
      93       2  290093    866932   2186692      1.81
      27       2  283805    916232   2038156      1.75
      28       1  281631   1596708   1727532      1.97
       9       1  267060   1564664   1815164      2.00
      11       2  266783   1002556   2138700      1.86
       5       1  264425   1067524   1360380      1.44
      10       1  257942   1689472   1991040      2.18
      25       1  236913   1244748   1377272      1.55
      15       1  231909   1622516   1983764      2.14
      13       1  229836   1634964   2080424      2.20
      28       2  221740    777552   1727532      1.48
      12       1  219561   1570800   1824384      2.01

Then I used this information to split the lp/pps to the disks, tried to make it balance.

And this is the result
Code:
Disk    Busy%     KBPS     TPS KB-Read KB-Writ  PgspIn        0  % Noncomp  40
hdisk5   51.5     1.4K   97.5     0.0     1.4K  PgspOut       0  % Client   40
hdisk4   54.0     1.4K   96.5     0.0     1.4K  PageIn        0
hdisk1   47.5   282.5    81.5     0.0   282.5   PageOut     378  PAGING SPACE
hdisk3   41.0   282.5    81.5     0.0   282.5   Sios        381  Size,MB   28672
cd0       0.0     0.0     0.0     0.0     0.0                    % Used      0
hdisk0    0.0     0.0     0.0     0.0     0.0   NFS (calls/sec)  % Free    100

It seems that the "Busy%" is balance , but the "KB-Writ" is not balance as expected.


I've made the change to 5 servers. The last server remaining is also the most abnormal one
Code:
Disk    Busy%     KBPS     TPS KB-Read KB-Writ  PgspIn        0  % Noncomp  52
hdisk4   18.5     1.6K   40.5     0.0     1.6K  PgspOut       0  % Client   52
hdisk5   22.0     1.6K   40.5     0.0     1.6K  PageIn        0
hdisk0   84.5   573.4   122.5     2.0   571.4   PageOut     489  PAGING SPACE
hdisk3   82.0   571.4   122.0     0.0   571.4   Sios        505  Size,MB   28672
hdisk1    0.0     0.0     0.0     0.0     0.0                    % Used      0
hdisk2    0.0     0.0     0.0     0.0     0.0   NFS (calls/sec)  % Free    100

You can see that, however the "KB-Writ" of hdisk4 and hdisk5 is higher than these of hdisk0 and hdisk3, the "Busy%" of hdisk0 and hdisk3 is higher than these of hdisk4 and hdisk5.

It's so complicated.
Last edited by rbatte1; 12-29-2014 at 06:05 AM.. Reason: Change CODE tags to QUOTE tags for text quoted from bakunin. - RBATTE1 corrected some spelling.
 

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