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Dell PowerVault 124T LTO3 and Performance Tuning

Updated: 22 May 2010 | 1 comment
Matt Walker's picture
Matt Walker
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All,
 
Enviroment
Backup Exec 11D (7170)
Windows 2003 Standard - 64bit
Dell PowerEdge 1950
Intex Xeon 5110 1.6GHz
4GB Ram
(2) 10K 73GB Drives on a Raid 1 (PERC 5/i raid)
Adaptec 39320A SCSI Controller
Dell PowerVault 124T LTO3 autoloader
 
Has anyone figured out what the optimal tunings are for the drive settings (Block Size, Buffer Size, Buffer count, read/write single block mode, etc.)??
 
I'm currently using a block size of 64K (I can choose from 512 to 64K), Buffer Size 1024K (32K - 1024K are my choices), Buffer count 32. Write single block mode and Write SCSI pass-through mode are currently selected.
 
Backing up the local backup server (drive is directly connected - only thing on SCSI bus) (6,967,428,634 bytes total). I'm only getting around 980MB/min. It will start off high, but as the job gets close to finishing, I've noticed that it slows down considerably.
 
I don't expect the rated performance, but am wondering do I have things as hot-rodded up as can be?
 
Thanks,
 
Matt
 
 
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Christiane Petersen's picture
24
May
2007
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Christiane Petersen
Symantec Employee

Matt,
 
From a Symantec perspective, we recommend you use the "default" setting for the Block Size, Buffer Size, Buffer count, however, you could try contacting your hardware vendor for further performance "tweaking".  Regarding the "Write SCSI pass-though mode", I  would recommend you deselect it if you do not have the Backup Exec Shared Storage Option (SSO) installed. 
 
Regards,
 
Christiane

Technical Support

Symantec.com

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