8、设计使用年限:50年
9、建筑耐火等级:一级
10、屋面防水等级:‖级
11、结构类型:钢框架混凝土核心筒结构。地下部分为剪力墙结构,其中柱为劲性柱,电梯井和楼梯间墙体也为劲性结构,楼梯为混凝土现浇楼梯;地上部分为:电梯井和楼梯间墙体为劲性结构,楼梯为混凝土现浇楼梯;地下模板采用多层板模板体系,地上部分采用大模板体系。楼板为钢筋桁架楼承板体系在本方案不予叙述。
励志故事(3)
如何ZFS的重复数据删除的主内存大小 November 2011 2011年11月
by Dominic Kay 多米尼克凯
How to determine if enabling ZFS deduplication, which removes redundant data from ZFS file systems, will save you disk space without reducing performance.如何确定如果启用ZFS的重复数据删除,从ZFS文件系统中删除冗余数据,将节省您的磁盘空间,而不降低性能。 What Is ZFS Deduplication?什么是ZFS重复数据删除?
In Oracle Solaris 11, you can use the deduplication ( dedup ) property to remove redundant data from your ZFS file systems.在Oracle Solaris 11中,您可以使用重复数据删除dedup dedup)财产从您的ZFS文件系统中删除冗余数据。 If a file system has the dedup property enabled, duplicate data blocks are removed as they are written to disk.如果文件系统已经启用的dedup财产,重复的数据块被删除,因为它们被写入磁盘。 The result is that only unique data is stored on disk and common components are shared between files, as shown in Figure 1.其结果是唯一的数据存储在磁盘上常见的组件之间共享文件,如图1所示。
Figure 1. 图1。 Only Unique Data Is Stored on Disk 唯一的数据存储在磁盘上
In some cases, this can result in tremendous savings in disk space usage and cost.在某些情况下,这可能会导致巨大的节省磁盘空间使用情况和成本。 Deduplication is easily enabled for a file system, for example:重复数据删除技术是很容易启用文件系统,例如:
# zfs set dedup=on mypool/myfs #ZFS dedup = mypool / myfs
Deduplication can result in considerable storage space savings for certain types of data, such as virtual machine images.重复数据删除可以导致某些类型的数据,如虚拟机映像,节省大量的存储空间。 Other types of data, such as text, might more efficiently be stored using data compression, which is also available in ZFS.其他类型的数据,如文本,可能会更有效地使用数据压缩,这也是在ZFS存储。
Before starting to use deduplication, there are two issues that need to be investigated:在开始使用重复数据删除之前,有两个问题,需要进行调查:
Is it worth using deduplication on this particular data?是否值得使用这个特定的数据的重复数据删除吗?
Does the server have enough memory installed to undertake deduplication?服务器是否有足够的内存,安装进行重复数据删除呢?
Guidance on these two issues is given below.下面给出这两个问题上的指导。
Is it Worth Using Deduplication on this Particular Data?是否值得使用这个特定的数据的重复数据删除吗?
To determine if your data would benefit from deduplication space savings, use the ZFS debugging tool, zdb .要确定如果您的数据将受益于重复数据删除节省空间,使用ZFS的调试zdb , ZDB。 If your data is not "dedup-able," there is no point in enabling dedup .如果你的数据是不是“dedup能够”有没有使点dedup 。
Deduplication is performed using checksums.重复数据删除是使用校验。 If a block has the same checksum as a block that is already written to the pool, it is considered to be a duplicate and, thus, just a pointer to the already stored block is written to disk.如果一个块具有相同的校验作为一个已经写入池中的块,它被认为是重复的,因此,只是一个指针到已存储的块写入磁盘。
Therefore, the process of trying to deduplicate data that cannot be deduplicated simply wastes CPU resources.因此,试图重复数据删除,不能重复数据删除的过程中,只是浪费CPU资源。 Deduplication in ZFS is in-band.在ZFS中的重复数据删除是在波段。 The deduplication occurs when you write to the disk.当您写入到磁盘的重复数据删除。 This is when the (unnecessary) CPU load will be incurred.这是(不必要的)CPU负载时将发生。