EXPERT RESPONSE
There are a lot of unknowns so it would be inappropriate to make a specific recommendation without more details of your environment. For example, I'm not clear if your clients are accessing 1.5 MByte-sized files, or if each user is doing 1.5Mbit/second I/O to the TGA files. Likewise, it's not clear if multiple users are accessing the same files or if they are working on unique files at any given time. How many SATA disk drives do you have configured in the RAID-5 setup, and do you have 2 TB usable storage or 2 TB total storage. For example, if you have eight 250 GB SATA disk drives (2 TB raw or total storage) that could work out to only 1.75 TB of RAID-5 storage (e.g. 7+1) or less if a hot spare disk drive were configured.
So, if you are doing lots of large writes and updates, you may want to look at not using RAID-5 given its parity overhead impact on performance. You might consider RAID-0+1 as well as look at migrating to higher performance SAS disk drives. While a NAS server may be a good fit, if you are using your Linux server for file serving that would accomplish the same purpose. However, take a look to see if you have adequate network bandwidth to your clients. iSCSI could be a good fit. However, if your users are accessing a shared volume, than NAS could be a good fit. On the other hand, iSCSI storage with SAS disk drives attached to your Linux server would be a good solution as well.
Do you know:
How to minimize I/O latency?
How to implement SAS storage?
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