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From "Olivier Grisel (JIRA)" <j...@apache.org>
Subject [jira] Commented: (WHIRR-189) Hadoop on EC2 should use all available local storage
Date Tue, 04 Jan 2011 12:45:46 GMT

    [ https://issues.apache.org/jira/browse/WHIRR-189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12977263#action_12977263
] 

Olivier Grisel commented on WHIRR-189:
--------------------------------------

FYI the local drive that has the most space on the m1.small instances is not mounted on  /
but on  /media/ephemeral0

[ec2-user@ip-10-203-86-244 ec2-user]$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/xvda1            7.9G  1.8G  6.1G  23% /
tmpfs                 840M     0  840M   0% /dev/shm
/dev/xvda2            147G  6.4G  133G   5% /media/ephemeral0
[ec2-user@ip-10-203-86-244 ec2-user]$ sudo /sbin/hdparm -tT /dev/xvda2

Both drives have the same (read) speed though:

/dev/xvda1:
 Timing cached reads:   3966 MB in  2.05 seconds = 1939.33 MB/sec
 Timing buffered disk reads:  372 MB in  3.02 seconds = 123.23 MB/sec

/dev/xvda2:
 Timing cached reads:   4442 MB in  2.00 seconds = 2222.59 MB/sec
 Timing buffered disk reads:  376 MB in  3.00 seconds = 125.19 MB/sec
[ec2-user@ip-10-203-86-244 ec2-user]$ sudo /sbin/hdparm -tT /dev/xvda1



> Hadoop on EC2 should use all available local storage
> ----------------------------------------------------
>
>                 Key: WHIRR-189
>                 URL: https://issues.apache.org/jira/browse/WHIRR-189
>             Project: Whirr
>          Issue Type: Improvement
>          Components: service/hadoop
>            Reporter: Tom White
>             Fix For: 0.3.0
>
>


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