Topic Last Modified: 2010-12-10

This section describes the database disk activity for the Microsoft Lync Server 2010 databases.

Front End Pool Databases

The following table lists the peak and average disk activity for the Front End pool databases, with 80,000 users in the pool.

Front End Pool Database Usage

Database Peak usage in bytes per read and write Average usage in bytes per read and write Peak usage in reads and writes per second Average usage in reads and writes per second

Back End data drive

Read: 65,536 bytes/read

Write: 193,634.45 bytes/write

Read: 972.12 bytes/read

Write: 3104.62 bytes/write

1.27 reads/second

3,553.79 writes/second

0 reads/second

143.91 writes/second

RTC log

Read: 61,440 bytes/read

Write: 5,632 bytes/write

Read: 2106.05 bytes/read

Write: 896.71 bytes/write

1.20 reads/second

161.41 writes/second

0 reads/second

45.34 writes/second

RTCdyn log

Read: 61,440 bytes/read

Write: 10,011.6 bytes/write

Read 284.86 bytes/read

Write: 4038.77 bytes/write

1.93 reads/second

499.3 writes/second

0 reads/second

330.93 writes/second

Tempdb data and log (see note following table)

Read: 65,536 bytes/read

Write: 62,863.64 bytes/write

Read: 21,267.43 bytes/read

Write: 59,383.11 bytes/write

15.73 reads/second

166.89 writes/second

0.31 reads/second

65.26 writes/second

RtcAb log (during nightly maintenance)

Read: 0

Write: 58,868.66 bytes/write

Read: 0

Write: 27,530.26 bytes/write

0 reads/second

586.97 writes/second

1.27 reads/second

43.77 writes/second
Note:
For optimal performance, you should divide tempdb into multiple data files of equal size. These multiple files do not necessarily have to be on different disks or spindles unless you are also encountering I/O bottlenecks as well. The general recommendation is to have one file per CPU because only one thread is active per CPU at one time. For details about best practices, see http://go.microsoft.com/fwlink/?LinkId=205442.

Content Collaboration Database Usage

Category Peak usage in bytes per read and write, 10,000 provisioned users Average usage in bytes per read and write, 10,000 provisioned users Average disk reads and writes per second, 10,000 provisioned users

Overall I/O rate for content collaboration

Read: 65,408 bytes/read

Write: 158,067 bytes/write

Read: 1354 bytes/read

Write: 13,902 bytes/write

0.17 reads/second

5.914 writes/second

Monitoring Server and Archiving Server Databases

Monitoring Server has separate databases for call detail records (CDRs) and Quality of Experience (QoE) data. With 240,000 users, the average database growth rate is 0.9 GB/hour for the CDR database, and 0.8 GB/hour for the QoE database. These numbers assume the Lync Server 2010 user model, where 50% of users are unified communications (UC) enabled.

For an Archiving Server supporting 240,000 users, the average database growth rate is 1.4GB/hour.

The following table lists the peak and average disk activity for the Monitoring Server and Archiving Server databases.

Category Average bytes per read and bytes per write (240,000 users) Peak bytes per read and bytes per write (240,000 users) Disk reads and writes per second (240,000 users)

Collocated Monitoring and Archiving databases

Data drive (CDR data file, QoE data file, and Archiving data file):

  • 8445 bytes/read

  • 68,823 bytes/write

Log drive (CDR log file and Archiving log file)

  • 0 bytes/read

  • 2951 bytes/write

Log drive (QoE log file)

  • 0 bytes/read

  • 5378 bytes/write

Data drive (CDR data file, QoE data file, and Archiving data file):

  • 60,000 bytes/read

  • 646,323 bytes/write

Log drive (CDR log file and Archiving log file)

  • 0 bytes/read

  • 4200 bytes/write

Log drive (QoE log file)

  • 0 bytes/read

  • 6700 bytes/write

Data drive (CDR data file, QoE data file, and Archiving data file):

  • 14.67 reads/second

  • 709 writes/second

Log drive (CDR log file and Archiving log file)

  • 0 reads/second

  • 678 writes/second

Log drive (QoE log file)

  • 0 reads/second

  • 141 writes/second

Archiving database

Data drive:

  • 1462 bytes/read

  • 74,160 bytes/write

Log drive

  • 0 bytes/read

  • 1770 bytes/write

Data drive:

  • 14,336 bytes/read

  • 1,000,000 bytes/write

Log drive

  • 0 bytes/read

  • 3184 bytes/write

Data drive:

  • 0.01 reads/second

  • 172 writes/second

Log drive

  • 0 reads/second

  • 736 writes/second

Monitoring database

Data drive (CDR data file and QoE data file):

  • 18,271 bytes/read

  • 47,384 bytes/write

Log drive (CDR log file)

  • 0 bytes/read

  • 3402 bytes/write

Log drive (QoE log file)

  • 0 bytes/read

  • 5871 bytes/write

Data drive (CDR data file and QoE data file):

  • 65,405 bytes/read

  • 1,722,052 bytes/write

Log drive (CDR log file)

  • 0 bytes/read

  • 4982 bytes/write

Log drive (QoE log file)

  • 0 bytes/read

  • 8892 bytes/write

Data drive (CDR data file and QoE data file):

  • 145 reads/second

  • 443 writes/second

Log drive (CDR log file)

  • 0 reads/second

  • 367 writes/second

Log drive (QoE log file)

  • 0 reads/second

  • 118 writes/second

The following table shows the disk usage for the archiving of content collaboration.

Content Collaboration Archiving Database Usage

Category Peak usage in bytes per read and write, 10,000 provisioned users Average usage in bytes per read and write, 10,000 provisioned users Average disk reads and writes per second, 10,000 provisioned users

Content collaboration archiving

Read: 65,425 bytes/read

Write: 106,389 bytes/write

Read: 1073 bytes/read

Write: 6843 bytes/write

0.161 reads/second

25.491 writes/second