kalau kernel Linux sudah mampu memanfaatkan kemampuan maksimal SSD, mestinya SSD masih membantu bila digunakan sebagai cache
http://lwn.net/Articles/408428/ On Mon, Dec 13, 2010 at 11:58 AM, dikshie <[email protected]> wrote: > http://dx.doi.org/10.1145/1519065.1519081 > ----------- > Recently, flash-based solid-state drives (SSDs) have become standard > options for laptop and desktop storage, but their impact on enterprise > server storage has not been studied. Provisioning server storage is > challenging. It requires optimizing for the performance, capacity, > power and reliability needs of the expected workload, all while > minimizing financial costs. In this paper we analyze a number of > workload traces from servers in both large and small data centers, to > decide whether and how SSDs should be used to support each. We analyze > both complete replacement of disks by SSDs, as well as use of SSDs as > an intermediate tier between disks and DRAM. We describe an automated > tool that, given device models and a block-level trace of a workload, > determines the least-cost storage configuration that will support the > workload's performance, capacity, and fault-tolerance requirements. We > found that replacing disks by SSDs is not a costeffective option for > any of our workloads, due to the low capacity per dollar of SSDs. > Depending on the workload, the capacity per dollar of SSDs needs to > increase by a factor of 3-3000 for an SSD-based solution to break even > with a diskbased solution. Thus, without a large increase in SSD > capacity per dollar, only the smallest volumes, such as system boot > volumes, can be cost-effectively migrated to SSDs. The benefit of > using SSDs as an intermediate caching tier is also limited: fewer than > 10% of our workloads can reduce provisioning costs by using an SSD > tier at today's capacity per dollar, and fewer than 20% can do so at > any SSD capacity per dollar. Although SSDs are much more > energy-efficient than enterprise disks, the energy savings are > outweighed by the hardware costs, and comparable energy savings are > achievable with low-power SATA disks. > ------------- > > -- > Right or wrong my list. Unsubscribe option is currently unavailable. > Indeed, it's available upon request .. but: cepek dulu donk! > > -- Right or wrong my list. Unsubscribe option is currently unavailable. Indeed, it's available upon request .. but: cepek dulu donk!
