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.
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