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тАО03-30-2006 08:06 AM
тАО03-30-2006 08:06 AM
Looking for some help. I am running DP 5.1 Cell HP-UX 11i 2 HBA connected to McData Switches zoned to see the Adic i2000 LTO3. I am only getting about 100gig per hour. Same as my network backups I am missing something. Help appreciated.
Thanks
Solved! Go to Solution.
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тАО03-30-2006 07:27 PM
тАО03-30-2006 07:27 PM
Re: SAN backups performance
Just select the system performance tab and try it out. That will tell you what data rates your are getting from your disks and therefore the maximum you can back up.
If you suspect the drive (which is less likely) then you can use the device performance tab and try writing test data to a tape. That will tell you the performance of the server, HBA, driver, cabling and drive/media - which ought to be 80MB/S+ (300 GB/hr) for an LTO3.
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тАО03-31-2006 01:01 AM
тАО03-31-2006 01:01 AM
Re: SAN backups performance
Also:
Are you sure you are feeding your backup system enough data to fully utilize the drives? i.e. it is possible you are streaming 4 save streams (filesystems/paths) to just 1 LTO drive inside your ADIC... or if you onlyhave 1 LTO drive - then 100GB / hour is pretty decent already.
HTH.
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тАО03-31-2006 01:14 AM
тАО03-31-2006 01:14 AM
Re: SAN backups performance
I am running 1 drive in this test backup. Tried mulitple file systems and one file systems range from 50 to 400 gig being backed up. I ran a backup over the network and got 138gig an hour to one drive. SAN should be faster then LAN in my opion.
Thanks for the info.
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тАО03-31-2006 01:22 AM
тАО03-31-2006 01:22 AM
Re: SAN backups performance
Peace and Clean Air/Earth.
Can you elaborate how you did your network based backup please? You mentioned you were able to get better network backup throughput than your SAN(locally) based backup to your LTO. Was your network backup from disks - to your desitnation backup server and on to your LTO3 drive on your backup server? Or is it to a disk on another server?
IIRC, LTO3 has an average throughput (uncompressed) of about 30 MB/sec -- which should be around 108GB/hour assuming everything is perfect.. This closely matches your observed throughput of 100GB / hour. So I think you do not have a problem. Also have you checked if your backup software has compression enabled (bot onthe software and in the hardware)? -- This can additionally bump up your throughput in some cases.
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тАО03-31-2006 01:49 AM
тАО03-31-2006 01:49 AM
Re: SAN backups performance
Data Protector 5.1 cell manager (Zeus) is HP-UX 11i L1000, 2 HBA 2gig A6795A to McData switch. I am using Adic i2000 with 3 LTO 3 drives Fiber to McData switch. Zoned so Zeus can see drives and robotics. Backup that I got 138gig hour was a different server called Sally using Zeus's drives. Sally's disk is fiber attached SAN disk. It backed up about 150gig.
Also LTO 2 is closer to 30mb/sec. LTO3 is more closer to 80mb/sec. Native.
For network base backups my through put is very good. but I should not be getting the same through put for SAN backups am I missing something?
Thanks for you info
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тАО03-31-2006 01:57 AM
тАО03-31-2006 01:57 AM
Re: SAN backups performance
I set up another server Dudley through the SAN zoned for the Adic i2000 same as I did for Zeus. So this is using it own devices going over the SAN to backup its fiber attached devices through put same as network or little worse.
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тАО03-31-2006 02:33 AM
тАО03-31-2006 02:33 AM
Re: SAN backups performance
Well I think that is still normal... via network your only overhead is network (if it's a pure GigE link to your backup server - you can have throughputs of as high as 60-70 Mbytes/sec. -- IF sally and dudley's filesystems can support it). On Zeus - it probably is using compression both on software and the drive so it can possibly push the stream better to the LTO device -- or possibly using/streaming to more than one LTO drive.
When you backup Sally and Dudley locally (SAN based) - are their HBAs common for both the disks and the LTO drive(s)? If it is - then I can already see that overhead.. The same HBA being used to suck data out of your disks and the same HBA used to push it to tape. Our SAN backup architecture is such that our robots and library have their own SAN and their own HBA(s)...
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тАО03-31-2006 02:45 AM
тАО03-31-2006 02:45 AM
Re: SAN backups performance
I would just think that a server connected to a SAN and library connected to a SAN basically local connection would get alot better though put.
Past experience I used a MSL6060 LTO2 drives over the SAN getting close to 220 gig an hour. I expect at least that from LTO3.
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тАО03-31-2006 02:55 AM
тАО03-31-2006 02:55 AM
Re: SAN backups performance
1.) Check your SAN configuration for errors or configuration efficiencies.
2.) Get HP's help
3.) Get ADIC's help
4.) Get HP and ADIC together if you can.