[jira] [Commented] (TS-667) Ability to keep traffic server from initializing the wrong disks when using RAW disk mode.

["Leif Hedstrom (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TS-667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13102328#comment-13102328 ] 

Leif Hedstrom commented on TS-667:
----------------------------------

This is still a good idea, however, John Plevyak pointed out an "easy" workaround, at least on Linux, where there are multiple ways to find the raw device. In my case, I can use either of

/dev/sdd
/dev/disk/by-id/ata-Maxtor_6B300S0_B612SBPH
/dev/disk/by-path/pci-0000:06:00.0-scsi-1:0:0:0


The first one of course is problematic, because it can change at any time if the kernel so decides. But the last two ought to uniquely identify the disk (or a partition within the disk, at least in the case of by-id).

> Ability to keep traffic server from initializing the wrong disks when using RAW disk mode.
> ------------------------------------------------------------------------------------------
>
>                 Key: TS-667
>                 URL: https://issues.apache.org/jira/browse/TS-667
>             Project: Traffic Server
>          Issue Type: Improvement
>          Components: Cache, Configuration
>            Reporter: David Robinson
>            Priority: Minor
>              Labels: features
>             Fix For: 3.1.2
>
>
> When disk devices are configured in storage.config for RAW mode they are automatically initialized when traffic server first starts up. If disk device names change later due to adding/removing disks or kernel changes trafficserver will overwrite disks that the user may not want to be cache disks. This leads to data loss on the affected disks.
> Maybe a feature could be added similar to squid's -z where cache disks must be explicitly initialized before they can be used. Or a configuration variable that changes trafficserver's initialization behavior. 
> (6:49:06 PM) zwoop: so, maybe have a few settings for the config
> (6:49:06 PM) zwoop: 0 - Let it reinitialize cache as it likes
> (6:49:06 PM) zwoop: 1 - Only initialize cache explicitly
> (6:49:06 PM) zwoop: 2 - Only initialize cache explicitly, and refuse to start up if we detect a cache disk with bad header

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