Microsoft has intensively worked on Exchange Server 2010 for reducing IOPS per user for optimizing database performance and thereby, reduction in storage cost. IOPS per user has been reduced by 90% from Exchange Server 2003 and 70% from Exchange Server 2007.
JBOD allows you to achieve the same performance with reduced storage cost by using JBOD. The main advantages of using JBOD are that you can fully utilize the disk space,
unlike in other RAID levels where space is limited to the smallest disk
with the array. For example, if disk array consists of 3 disks (320GB,
500GB and 250GB), the total space assigned to the operating system would
be 1070 TB. Other benefit of JBOD is that basic SATA disks are inexpensive in comparison with SSCI and SAS drives.
Does JBOD provide any redundancy?
You should always remember that
JBOD does not offer any redundancy unlike RAIDs. JBOD is just the usage
of inexpensive disks (SAS or SATA disk). JBOD solution is only
recommended in an environment having minimum 3 mailbox server nodes with
3 database copies per database (as shown below). Use RAID if your
organization has only Exchange 2010 Mailbox server with no redundancy or
two Exchange 2010 Mailbox servers in a DAG.
How can we validate JBOD storage?
I always recommend readers to use
Exchange 2010 Mailbox Calculator (Storage Design tab) to see which JBOD
best suits your requirements.
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