Server-based SSD definition


A server-based SSD is a solid state drive that may be manufactured in a PCI Express form factor. It could also be a SATA or SAS drive that plugs into the standard SATA/SAS interface, allowing it to be installed directly into a server.

Server-based SSDs can function as a cache in the server or as persistent storage, allowing the SSD server to have essentially an extremely fast scratch disk for very frequently accessed data. Putting this high performance storage directly in the server reduces latency because the server doesn’t have to access data on an external storage array. Because of this, server-based SSDs are high performance direct-attached storage. These SSD server drives are typically NAND flash-based.

Server-based SSDs are most often used for frequently accessed data in a database. Some examples of this are database indexes or whole databases. These best-use cases can reduce data access latency by as much as 90%. Both server vendors as well as some storage vendors offer server-based SSDs.

SSD technology helps reduce server sprawl

Solid-state drives are still more expensive than spinning disks, but SSD technology can improve I/O performance, reducing the number of servers and storage arrays you need.
The more you spend, the more you save. That's what some IT managers find when, in their effort to improve I/O performance,... Last year the reference website Answers.com began to experience I/O performance bottlenecks on its database servers, which were Hewlett-Packard Co. BladeSystem ProLiant Server Blades. Answers.com runs the MySQL databased and configures each cluster with a master database server, plus a farm of read-only, synchronized database slaves that handle the bulk of queries.
As the site grew and received more updates, it became difficult for these slaves to serve incoming requests quickly -- and handle the replication updates coming from the master -- and response times were taking a hit.

Tackling I/O issues with SSD technology


Usually, the solution to I/O problems is to connect servers to storage arrays configured with lots and lots of spinning hard-disk drives, "but that's not very economical to house and maintain and to pay for in terms of power consumption," said Dan Marriott, the director of production operations at Answers.com.
Nor could the firm simply add more nodes to its clusters.
"We can't buy unlimited servers; we have realistic hardware budgets," Marriott said.
Instead, Answers.com tried to put SSD technology in the slave servers. The company moved the database copy from internal disk drives to a 320 GB HP StorageWorks IO Accelerator, a NAND flash-based storage adapter that HP OEMs from Fusion-io, and replication recovery time decreased from 6 hours to 12.5 minutes, Marriott said.
ROI from SSD technology. In addition, the flash drive boosted the number of complex queries the servers could perform from 350 per second to 3,500 per second, and it improved application response time by 30%. That in turn allowed Answers.com to reduce the number of servers in each database read cluster from 20 down to five, for a net cost savings.
Even though the IO Accelerator cards cost about twice as much as an individual server, "we got immediate [return on investment]," Marriott said. Using approximate numbers, given a typical database cluster with 20 $5,000 servers, the company equipped five servers with a $10,000 flash drive, for a cost of $50,000, and repurposed the remaining 15 servers for a savings of $75,000.
"Deploying these Fusion-io cards actually saved us $25,000 in Capex for each of our database clusters, right off the bat," Marriott said.
Beyond that, Answers.com enjoys improved operational savings from the reduced number of servers, including admin time, space in its racks, power and cooling, and fewer points of failure, Marriott said.
"Less hardware equals less failure," he said.
Installing the card and its driver is "trivial," Marriott said. "It's the simplest thing; you just add the mezzanine card, which takes about 60 seconds. Then you reboot the server, install the driver, format the drive, then you copy your data across, and away you go."

SSD technology en masse


Of course, using Flash to improve performance is nothing new, but the use of SSDs in the enterprise is on the rise, said Jeff Janukowicz, IDC's research manager for SSDs. It's still an early market, but IDC expects that between now and 2014, shipments of enterprise SSDs will grow by 75%, he said.
IDC attributes SSD's growth in the enterprise to two factors: decreasing cost and the rise of multicore processors. Over the past decade, the price of NAND memory decreased by 50% per year, Janukowicz said. On a dollar-per-gigabyte basis, SSDs still cost about 28 times that of traditional hard disk drives, but IDC expects that number to continue to drop.
"We don't anticipate that SSD will ever be cheaper than hard disk drives, but that's not really necessary," Janukowicz said. "It's more about leveraging SSDs for what they can bring to the system."
At the same time, faster microprocessors have an increased thirst for fast storage subsystems.
"Moore's Law and recent advancements in processor power have put pressure on storage subsystems to keep the processor filled with data," Janukowicz said.
Fusion-io's SSD-on-PCIe adapter card is but one variation on the enterprise SSD theme. SSD is often integrated into traditional storage arrays, such as EMC's FAST, as a high-speed storage tier. On the device side, STEC, Pliant Technologies and other companies create serial-attached SCSCI (or SAS) drives based on SSD, and traditional hard disk drive manufacturers such as Seagate have also gotten in on the act. Finally, Violin Memory Inc. and Texas Memory Systems Inc. are among the companies that offer entire storage arrays created from SSD.
The real challenge is identifying which applications can make effective use of SSD technology, Janukowicz said. Workloads that are good candidates for SSDs include databases, online transaction processing, streaming video on demand and even virtual desktop infrastructure.
"In general, any workload that is I/O-intensive, those are the ones that will benefit the most," Janukowicz said.
Write-intensive applications, meanwhile, may or may not benefit from SSDs, Marriott said. But generally speaking, "if you're seeing performance problems because of I/O limits, there's a pretty good chance that Fusion-io or other enterprise-grade SSDs can be a game changer."
DÒNG THỜI GIAN

Đôi Bờ

SD Records 729

LỜI BÀI HÁT
Lyrics:

KraziNoyze:
Ai biết trước được chữ ngờ
Chuyện đời đâu có đẹp được như thơ
Qua một đêm tất cả thành hoài niệm, mà giật mình, cứ ngỡ…
Vẫn còn tay trong tay, nồng say, môi hôn bỏng cháy
Yêu thương đong đầy, mong đêm mong ngày, mỏi mòn… vẫn không thấy
Thoáng cái, tỉnh dậy, một ngày đẹp trời
Tất cả như lúc chưa bắt đầu, đời vẫn êm trôi
Lại quay về thực tại như vừa trải qua giấc mơ đẹp tuyệt vời
Ngày mới lại tới, người mới lại đến, buồn vui đan xen…
Kiếm cái cớ để gặp ba thằng anh em nơi quán quen
Ngồi tán phét, ngắm gái đẹp, lại chửi đời khi chán ghét
Ko biết đội nào vào bán kết, thằng nào vừa bị bắn chết
Lại cười như điên tới khi câu chuyện rơi vào tầm nhạt toẹt
Lại chìm trong lặng im
Thằng có gái nhắn tin, Thằng dí mặt vào màn hình
Thằng thì mơ màng khúc nhạc tình
Thằng men, thằng khói
SK hút nốt điếu thuốc cuối
Hết thuốc rồi, để tao đi...

BlakRay:
Yeah I got friends, some homies I held dear
We used to tag along, good old time hanging out
freak asses sipping beers, being weird
I do remember that feeling, I guess you love it too, same here.
But I disconnected with some and lost a few others through years
They say parting's the hardest word, but I guess reminding's even harder
You get the flashback with all those memories, and the feeling you been trying to harbor
The one who always stay moved away
The one who always crack a joke send no more words, I hope he's safe
the one who had a big dream buried it and gone,
Now I guess she's out there, in some place, I hope she's safe
And I gotta part way with another brother soon, I hope he would be safe
I know it's life,
People gotta move on, but let's cherish the moment
even though we parted way, trust me
for errtime we have a chance to sit together, it's like we can take back a long lost century

DSK:
Ánh đèn vàng, đêm chạng vạng
5, 7 thằng vịn vai bá cổ vẫn lang thang
Rít 1 hơi, rít thật sâu, chuyền tay
Homie tao chia điếu thuốc này cùng với mày
Bao năm không gặp ai ngờ đường đời lại cắt nhau thêm lần nữa
Cùng ăn tối, đêm vào club, bước ra đường là khi bóng người đã dần thưa
Trên con đường vắng
Ai cũng nghĩ chúng mình làm chủ thế giới này
Chòm sao hả? Bọn tao chỉ cần phải ngước lên và với tay
Trong nhóm bọn tao, có những thằng lông bông, ham vui đấm đá
Có những thằng chuyển sang kinh doanh giờ thì khấm khá
Có thằng ku kia giờ làm bác sĩ, dù chưa bao giờ nó nghĩ rằng sẽ học ngành y
Thằng con nhà giàu tưởng ổn nhất thì phá sản, cái công ty vừa thanh lý
Vài thằng dính vào vũng lầy ma túy, phá thân thể
Còn tao theo đuổi đam mê, thì giờ vẫn thế
Dòng đời xô đẩy mỗi thằng một hướng
Cùng 1 gốc, nhưng lớn lên thì mỗi thằng 1 môi trường
Mỗi thằng 1 suy tư, có thằng định di cư
Nhưng đêm nay cứ vui đi
Còn bia ko? Cứ khui đi
Hết thuốc à? Hút thuốc gì? Tao đi mua

DJ Jin:
Thank you
Good night
&
Farewell
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