It all depends really on the usage. If you're using a database and IOPS is important, you'll see a significant increase. If you're running a backup storage array, capacity/$ is important.
SAS/SCSI hard drives at 15000rpm are of course a bit faster than 7200rpm SATA/SAS/SCSI drives but if your network is a bottle neck, it doesn't really matter whether you put in 5400rpm drives or SSD's. Also with RAID (or RAID-like systems like ZFS) and a lot of hard drives, the bottle neck really shifts towards the controllers and/or the bus it's connected to. So you should analyze why the decision was made to use SATA disks (usually price) and whether the cost of SAS drives (300% increase in costs, 50% increase in speed, 300% decrease in potential capacity) is really worth it. Benchmark your system and the disks you're looking at and see whether it's worth it. IMHO: for most uses not, attaching/enabling caches or getting more memory could increase your responses significantly for way less. -- This message posted from opensolaris.org _______________________________________________ opensolaris-discuss mailing list [email protected]
