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https://issues.apache.org/jira/browse/TS-745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13631084#comment-13631084
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Leif Hedstrom commented on TS-745:
----------------------------------
We had a long, heated discussion about this, so capturing some of this in this
email.
First, we all agree that this should be a "Tiered Cache", and not specific to
SSD. So code and configs etc. should properly reflect that.
Secondly, I obviously dislike the idea of storing some disk configs in
storage.config, and some in records.config. I understand making this change is
a big deal for Taobao, so I'm offering a compromise:
1) We add support for storage.config, with a new tag similar to the tag
TS-1728. Maybe something like
{code}
/dev/sda tier=1
/dev/sdb tier=1
/dev/sdc tier=2
/dev/sdd tier=2
{code}
Where tier=1 is "SSD" (or whatever fast storage device you have, what currently
gets configured in records.config) and tier=2 is all other disks (what's
currently in storage.config).
2) In addition, we keep the records.config setting in mgmt/RecordsConfig.cc,
and make it "populate" the tier=1 disks. This option will not be documented, or
added to records.config.default.in. It's purely there to allow Taobao to merge
with upstream and not having to maintain a fork. Long term, I'd imagine this
config goes away, as we refactor all the configuraitons into a unified
"VirtualHost" conceptual config.
James and I (and hopefully John too) will continue reviewing this complicated
piece of code in the next week or two. The goal is to land this for v3.3.3,
which is Mid-May. We do need to make sure this also doesn't conflict with
TS-1728, which also should be landed for v3.3.3.
Feedback please.
> Support ssd
> -----------
>
> Key: TS-745
> URL: https://issues.apache.org/jira/browse/TS-745
> Project: Traffic Server
> Issue Type: New Feature
> Components: Cache
> Reporter: mohan_zl
> Assignee: weijin
> Fix For: 3.3.4
>
> Attachments: ts-745.diff, TS-ssd-2.patch, TS-ssd.patch
>
>
> A patch for supporting, not work well for a long time with --enable-debug
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