DELL H700使用CacheCade的問題, 答案揭曉了....

per1-q1222

http://support.dell.com/support/edocs/software/svradmin/6.4/en/omss/ecache.htm?~file=/software/svradmin/6.4/en/omss/ecache.htm

CacheCade is used to improve random read performance of the Hard Disk Drive (HDD) based Virtual Disks. A solid-state drive (SSD) is a data storage device that uses solid-state memory to store persistent data. SSDs significantly increase the I/O performance (IOPS) and/or write speed in Mbps from a storage device. With Dell Storage Controllers, you can create a CacheCade using SSDs. The CacheCade is then used for better performance of the storage I/O operations. Use either Serial Attached SCSI (SAS) or Serial Advanced Technology Attachment (SATA)SSDs to create a CacheCade.

Create a CacheCade with SSDs in the following scenarios:

• Maximum application performance—Create a CacheCade using SSDs to achieve higher performance without wasted capacity.
• Maximum application performance and higher capacity—Create a CacheCade using SSDs to balance the capacity of the CacheCade with high performance SSDs.
• Higher capacity—If you do not have empty slots for additional HDDs, use SSDs and create a CacheCade. This reduces the number of HDDs required and increases application performance.
  

The CacheCade feature has the following restrictions:

• Only SSDs with the proper Dell identifiers can be used to create a CacheCade.
• If you create a CacheCade using SSDs, the SSD properties are still retained. At a later point of time, you can use the SSD to create virtual disks.
• A CacheCade can contain either SAS drives or SATA drives but not both.
• Each SSD in the CacheCade does not have to be of the same size. The CacheCade size is automatically calculated as follows:
  CacheCade size =capacity of the smallest SSD * the number of SSDs
  

The unused portion of SSD is wasted and can not be used as an additional CacheCade or an SSD-based virtual disk.

• The total amount of cache pool with a CacheCade is 512 GB. If you create a CacheCade which is larger than 512 GB, the storage controller still uses only 512 GB.
• The CacheCade is supported only on Dell PERC H700 and H800 controllers with 1 GB NVRAM and firmware version 7.2 or later.
• In a storage enclosure, the total number of logical devices including virtual disks and CacheCade(s) cannot exceed 64.
  

這根本整死人...
PFK塞到1GB NVC Cache..

per1-q1222

stonecold 发表于 2011-2-12 21:13
还有CTIO功能优化SSD， 请问具体设定是什么？ WT,DIO,NRA ???越多SSD就越明显？

WT&NRA&DIO,64KB....SSD愈多愈明顯...

stonecold

还有CTIO功能优化SSD， 请问具体设定是什么？ WT,DIO,NRA ???越多SSD就越明显？

thenero

哎蛋定把~~~

zjlove18

略高端   ...

五湖废人

我自横刀向天笑，笑完之后去睡觉= =~~