Forum Discussion

NBU2010's avatar
NBU2010
Level 6
10 years ago

Slow Performance Issue - Solaris 11

Hello Forum,

Solaris 11 MASTER/MEDIA.

NBU - 7.6.0.1

Backup Type  :  BCV SAN based. ( FS mounted on Media Server and taken on tape).

No. Of Drives per Media server : 8

STU Multiplexing : 3

Media Multiplexing : 3

Media server Memory : 393216 MB

Media Server Swap :

swapfile             dev    swaplo   blocks     free
/dev/zvol/dsk/rpool/swap 285,2        8K     4.0G     4.0G
 

NUMBER DATA BUFFER : 1048576
SIZE DATA BUFFER : 64

Try to achieve a throughput of 1 GB per stream, unable to get through.

Pls. suggest config changes/settings/parameters to be set to achieve the same.

 

Thanks in Advance

7.6
Backing Up
Backup and Recovery
NetBackup
Solaris
  • Nicolai's avatar
    Nicolai
    10 years ago

    Swap values around and retry the operation:

    NUMBER_DATA_BUFFERS = 512

    SIZE_DATA_BUFFERS = 262144

    Also try running GEN_DATA to see how fast the infrastructure can carry data. A file system may not be the best candidate

    Documentation: How to use the GEN_DATA file list directives with NetBackup for UNIX/Linux Clients for Performance Tuning

    http://www.symantec.com/docs/TECH75213

     

  • NBU2010's avatar
    NBU2010
    Level 6
    10 years ago

    Pls. also inform the procedure to create netbackup project in solaris 11 and doing shared memmory changes for faster backups.

     

  • Michael_G_Ander's avatar
    Michael_G_Ander
    Level 6
    10 years ago

    Have you checked what block size is best for your tape drives ? normally 256KB (262144) or higher for the newer tape drive like LTO. Your number of buffers looks very high to me.

    Also check that the storage under the mounted file system can deliver 3 GByte/sec and check what the native speed of the tape drives. For example LTO5 is 140 MB/sec so with mpx of 3 you will get around 46 MB/sec per stream.

    There is a technote about suggested kernel settings for Solaris

    Think you will max get 8 times the tape drives native speed (Staying with the LTO5 example this is 8*140 MB/sec = 1120 MB/sec or 1 GB/sec)

     

  • Nicolai's avatar
    Nicolai
    Moderator
    10 years ago

    Swap values around and retry the operation:

    NUMBER_DATA_BUFFERS = 512

    SIZE_DATA_BUFFERS = 262144

    Also try running GEN_DATA to see how fast the infrastructure can carry data. A file system may not be the best candidate

    Documentation: How to use the GEN_DATA file list directives with NetBackup for UNIX/Linux Clients for Performance Tuning

    http://www.symantec.com/docs/TECH75213

     

  • NBU2010's avatar
    NBU2010
    Level 6
    10 years ago

    Hi All,

    Tried various options by swapping the values in NUMBER and SIZE, but the average speed what i get is around 45 Mbps.

    This i am testing it on IBM flash storage and LTO6 tape drives.

     

  • revarooo's avatar
    revarooo
    Level 6
    10 years ago

    To what type of tape drive?

    45Mbps is not bad - have you had better than this?

    Did you try Nicolai's suggestion:

    Also try running GEN_DATA to see how fast the infrastructure can carry data. A file system may not be the best candidate