On Dec 7, 2010, at 9:49 PM, Edward Ned Harvey 
<opensolarisisdeadlongliveopensola...@nedharvey.com> wrote:

>> From: Ross Walker [mailto:rswwal...@gmail.com]
>> 
>> Well besides databases there are VM datastores, busy email servers, busy
>> ldap servers, busy web servers, and I'm sure the list goes on and on.
>> 
>> I'm sure it is much harder to list servers that are truly sequential in IO
> then
>> random. This is especially true when you have thousands of users hitting
> it.
> 
> Depends on the purpose of your server.  For example, I have a ZFS server
> whose sole purpose is to receive a backup data stream from another machine,
> and then write it to tape.  This is a highly sequential operation, and I use
> raidz.
> 
> Some people have video streaming servers.  And http/ftp servers with large
> files.  And a fileserver which is the destination for laptop whole-disk
> backups.  And a repository that stores iso files and rpm's used for OS
> installs on other machines.  And data capture from lab equipment.  And
> packet sniffer / compliance email/data logger.
> 
> and I'm sure the list goes on and on.  ;-)

Ok, single stream backup servers are one type, but as soon as you have multiple 
streams, even for large files, then IOPS trumps throughput to a degree, of 
course if throughput is very bad then that's no good either.

Know your workload is key, or have enough $$ to implement RAID10 everywhere.

-Ross

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