sslug-teknik team mailing list archive

[LOL@xxxxxxxxxxxxxxx]

On Tue, 5 Aug 2003 08:40:51 +0200
LOL@xxxxxxxxxxxxxxx wrote:

>> --[KLIP]---
>>
>> >Har du prøvet at køre software RAID i stedet?
>>
>> Jeg glemte åbenbart at skrive, at jeg kører med software raid.

>Altså Linus Software RAID ?
>I så fald skal du måle på /dev/md*
>F.eks. /dev/md2

Ja, linux software raid.
Hmmm, jeg har kørt med:

bonnie++ /home/scratch -u root

Ok, inden nogen siger at det er forkert rækkefølge vil jeg lige sige at det
er frit fra hukommelsen.

hvor /dev/md0 er mountet på /home/scratch
Mener du, at jeg får en forkert måling når jeg "måler" på directories
istedet for devices ?


Lige mine måleresultater igen til orientering:
|-------------------+--------+-------+-------+-------+-------+-------+-------+-------|
|Tested device      |Char    |CPU    |Block  |CPU    |Char   |CPU    |Block  |CPU    |
|transfer in KB/s,  |write   |load   |write  |load   |read   |load   |read   |load   |
|load in %          |        |       |       |       |       |       |       |       |
|-------------------+--------+-------+-------+-------+-------+-------+-------+-------|
|Hda7               |   17129|     95|  26056|      9|  17102|     86|  38483|      4|
|-------------------+--------+-------+-------+-------+-------+-------+-------+-------|
|Hde7               |   16799|     94|  39806|     14|  17593|     89|  44300|      6|
|-------------------+--------+-------+-------+-------+-------+-------+-------+-------|
|Hdg7               |   17374|     96|  40673|     14|  17875|     91|  45432|      5|
|-------------------+--------+-------+-------+-------+-------+-------+-------+-------|
|Raid0 (hde20 +     |   17143|     95|  44183|     16|  17950|     92|  45590|      7|
|hdg10)             |        |       |       |       |       |       |       |       |
|-------------------+--------+-------+-------+-------+-------+-------+-------+-------|
|Raid5 (hda6 + hde6 |   15525|     85|  36373|     13|  17667|     91|  55898|     10|
|+ hdg6)            |        |       |       |       |       |       |       |       |
|-------------------+--------+-------+-------+-------+-------+-------+-------+-------|




The next table is an example of how one hard disk parameter can influence
performance. The setup is the same, except now the hard disks IO has 32 bit
mode enabled (previous test used the default of 16 bit IO)
|---------------------+---------+------+-------+------+-------+------+-------+------|
|With 32 bit IO       |Char     |CPU   |Block  |CPU   |Char   |CPU   |Block  |CPU   |
|enabled (hdparm -c1) |write    |load  |write  |load  |read   |load  |read   |load  |
|---------------------+---------+------+-------+------+-------+------+-------+------|
|Hda7                 |    17576|    96|  29927|    10|  17191|    86|  39357|     5|
|---------------------+---------+------+-------+------+-------+------+-------+------|
|Hde7                 |    17588|    96|  41898|    15|  18353|    92|  45663|     5|
|---------------------+---------+------+-------+------+-------+------+-------+------|
|Hdg7                 |    17594|    96|  41985|    15|  17187|    86|  45957|     4|
|---------------------+---------+------+-------+------+-------+------+-------+------|
|Raid0 (hde20 + hdg10)|    17586|    96|  47989|    17|  18592|    94|  46019|     6|
|---------------------+---------+------+-------+------+-------+------+-------+------|
|Raid5 (hda6 + hde6 + |    15727|    87|  40422|    15|  18388|    93|  67075|    11|
|hdg6)                |         |      |       |      |       |      |       |      |
|---------------------+---------+------+-------+------+-------+------+-------+------|



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