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SQL Server Storage best practices
Server storage is one of the most important things for SQL Server performance. Chances to utilize a lot of RAM and powerful CPUs when storage system is slow are extremely small.
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One of the main properties of storage is IO or Throughput. So what is IO ? IO can also be called IOPs or IOs/sec. It determines how many operations per second can be done with current storage. If measured in MS/sec it determines how much data can be written and/or read.
You can following performance monitor counters to figure out the numbers in your system.
Performance Monitor: Logical Disk
Disk Read Bytes / Sec
Disk Write Bytes / Sec
Disk Read / Sec
Disk Writes / Sec
Latency is the time taken between request for the data and return of the data. It is measured in milliseconds (ms).
Performance Monitor: Logical Disk
Avg. Disk Sec / read
Avg. Disk Sec / write
More on healthy latency values later
Storage capacity determines how much data you can store.
Measured in GB/TaB
If you`re using some kind of RAID you should keep it in mind when calculating storage capacity cause you`ll get much less storage in RAID 10 comparing to RAID 5, on the flip side RAID 10 will be way much faster and more reliable.
Below is some storage specific terminology.
JBOD – Just a Bunch of Disks
SAME – Stripe and Mirror Everything
RAID – Redundant Array of Inexpensive Disks
DAS Direct Attached Storage
NAS Network Attached Storage
SAN Storage Area Network
CAS Content Addressable Storage
Traditional Spindle throughput
Below reefers to HDDs itself.
10K RPM – 100 -130 IOPs at ‘full stroke’
15K RPM – 150-180 IOPs at ‘full stroke’
Can achieve 2x or more when ‘short stroking’ the disks (using less than 20% capacity of the physical spindle)
These are for random 8K I/O
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Between 90MB/sec and 125MB/sec for a single drive
If true sequential, any block size over 8K will give you these numbers
Depends on drive form factor, 3.5” drives slightly faster than 2.5”
Approximate latency: 3-5ms
- Number of drives matter
- More drives typically yield better speed, do not confuse physical drives and LUNs (logical drives)
- True for both SAN and DAS
- … Less so for SSD, but still relevant (especially for NAND)
- If designing for performance, make sure the topology can handle it
- Understand the path to the drives
Best Practice: Validate and compare configurations prior to deployment
Random or sequential ?
Knowing if your workload is random or sequential in nature can be a hard question to answer. Depends a lot on application design. SQL Server Access Methods can give some insights. High values of Readahead pages/sec indicates a lot of sequential activity. High values of index seeks / sec indicates a lot of random activity.
Transaction log is for example always sequential
Best Practice: Isolate transaction log on dedicated drives(LUNs)
Configuring disks in Windows
- Use Disk Alignment at 1024KB
- Use GPT if MBR not large enough
- Format partitions at 64KB allocation unit size
- One partition per LUN
- Only use Dynamic Disks when there is a need to stripe LUNs using Windows striping (i.e. Analysis Services workload)
- Diskpar.exe, DiskPart.exe and DmDiag.exe
- Format.exe, fsutil.exe
- Disk Manager
|80/20||Random||8K||#cores/Files||Typical OLTP data files|
Typical IO workloads
OLTP (Online Transaction Processing)
Typically, heavy on 8KB random read / writes
Some amount of read-ahead
Size varies – multiples of 8K (see read-ahead slide)
Many “mixed” workloads observed in customer deployments
Rule of Thumb: Optimize for Random I/O (spindle count)
RDW (Relational Data Warehousing)
Typical 64-512KB reads (table and range scan)
128-256KB writes (bulk load)
Rule of Thumb: Optimize for high aggregate throughput I/O
Up to 64KB random reads, Avg. Blocks often around 32KB
Highly random and often fragmented data
Rule of Thumb: Optimize for Random, 32KB blocks
I/O patterns generally random in nature
Writes to data files through periodic checkpoint operations
Random in nature with heavy bursts of writes
Can issue a large amount of outstanding I/O
Steady writes to transaction log
Many ”OLTP” deployments consist of ”mixed” workload with some amount of online reporting
Will result in larger block I/O that is sequential in nature to happen concurrent with small block (~8K) I/O
Can make sizing more challenging
If you have any storage specific questions or want to discuss the topic in more details please don`t hesitate to leave a comment.