choosing a file system

[LALOT Dominique]

2009/1/5 Patrick Boutilier <boutilpj at ednet.ns.ca>

> David Lang wrote:
>
>> On Sat, 3 Jan 2009, Rob Mueller wrote:
>>
>>  But the new Solid-State-Disks seem very promising. They are claimed to
>>>> give 30x the throughput of a 15k rpm disk. If IO improves by 30 times
>>>> that should make all these optimizations unnecessary.
>>>> As my boss used to tell me ... Good hardware always compensates for
>>>> not-so-good software.
>>>>
>>> What we've found is that the meta-data (eg mailbox.db, seen db's, quota
>>> files, cyrus.* files) use WAY more IO than the email data, but only use
>>> 1/20th the space.
>>>
>>> By separating the meta data onto RAID1 10k/15k RPM drives, and the email
>>> data onto RAID5/6 7.2k RPM drives, you can get a good balance of
>>> space/speed.
>>>
>>
>> how do you move the cyrus* files onto other drives?
>>
>
> metapartition_files and metapartition-default imapd.conf options in
> cyrus-imapd 2.3.x


So, then, may be we can easily store pure email data on an NFS appliance,
keeping metadata on traditionnal filesystem, which can be synced using low
level tools

Dom



>
>
>
>
>> David Lang
>> ----
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>>
>
>
> ----
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> Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki
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>



-- 
Dominique LALOT
Ingénieur Systèmes et Réseaux
http://annuaire.univmed.fr/showuser?uid=lalot
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