Re: choosing a file system

["LALOT Dominique" <dom.lalot@xxxxxxxxx>]

2009/1/5 Patrick Boutilier <boutilpj@xxxxxxxxxxx>

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