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Re: AW: [ADSM-L] Migration Speed Has Plummeted
2005-08-17 09:46:34
Thanks for the info. Mark!
Would anyone happen to know of any good papers on SATA disk and the
ramifications/performance issues with it? Thanks again!
********************************
Joni Moyer
Highmark
Storage Systems
Work:(717)302-6603
Fax:(717)302-5974
joni.moyer AT highmark DOT com
********************************
"Stapleton, Mark"
<mark.stapleton@B
ERBEE.COM> To
Sent by: "ADSM: ADSM-L AT VM.MARIST DOT EDU
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Manager"
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.EDU> Re: AW: [ADSM-L] Migration Speed
Has Plummeted
08/17/2005 09:40
AM
Please respond to
"ADSM: Dist Stor
Manager"
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You can use SATA disk in a random-access pool, but you're going to get
performance hits because of the very nature of the disk.
--
Mark Stapleton (stapleton AT berbee DOT com)
Office 262.521.5627
________________________________
From: ADSM: Dist Stor Manager on behalf of Joni Moyer
Sent: Wed 8/17/2005 08:23
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: AW: [ADSM-L] Migration Speed Has Plummeted
Hi Mark,
If it's strength is within sequential access, is there anything that I can
do with the SATA disk at this point in time? Are there parameter changes
or different configuration usage that I can do in order to still utilize
the SATA disk as the disk storage pool? Or am I out of luck? Thanks
again!
********************************
Joni Moyer
Highmark
Storage Systems
Work:(717)302-6603
Fax:(717)302-5974
joni.moyer AT highmark DOT com
********************************
"Stapleton, Mark"
<mark.stapleton@B
ERBEE.COM> To
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Dist Stor cc
Manager"
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.EDU> Re: AW: [ADSM-L] Migration Speed
Has Plummeted
08/17/2005 09:15
AM
Please respond to
"ADSM: Dist Stor
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.EDU>
Remember that SATA disk has relatively crummy performance when you use
random access to it; SATA's strength lies in sequential access.
--
Mark Stapleton (stapleton AT berbee DOT com)
Office 262.521.5627
________________________________
From: ADSM: Dist Stor Manager on behalf of Joni Moyer
Sent: Wed 8/17/2005 08:02
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: AW: [ADSM-L] Migration Speed Has Plummeted
Hi Michael,
I've looked at my storage pools and they are defined with caching turned
off. This is EMC SATA disk that I have just defined, so I am wondering if
that is my bottleneck at this point. Thanks for the suggestion!
********************************
Joni Moyer
Highmark
Storage Systems
Work:(717)302-6603
Fax:(717)302-5974
joni.moyer AT highmark DOT com
********************************
"Michael
Garnebode"
<Michael.Garnebod To
e AT T-SYSTEMS DOT COM> ADSM-L AT VM.MARIST DOT EDU
Sent by: "ADSM: cc
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<[email protected] AW: [ADSM-L] Migration Speed Has
.EDU> Plummeted
08/17/2005 08:24
AM
Please respond to
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Hi Joni,
Have a look to your storagepool definition with "q stg f=d"
Migration Processes: 4
Next Storage Pool: WP_AZV01
Reclaim Storage Pool:
Maximum Size Threshold: 500 M
Access: Read/Write
Description: dp_azv01
Overflow Location:
Cache Migrated Files?: Yes
Collocate?:
Reclamation Threshold:
Maximum Scratch Volumes Allowed:
Delay Period for Volume Reuse:
You can update your storagepool definition with "upd stg"
regards
Michael
-----Ursprüngliche Nachricht-----
Von: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] Im Auftrag von
Joni Moyer
Gesendet: Mittwoch, 17. August 2005 14:19
An: ADSM-L AT VM.MARIST DOT EDU
Betreff: Re: [ADSM-L] Migration Speed Has Plummeted
Hello Everyone!
How do you know if caching is turned on? How/where can you turn it off? I
am having lousy migration speed perfomance as well. What can I look
at/change? I have an AIX 5.2 server at TSM 5.2.4.0 with LTO2 tape drives
attached. Thanks!
********************************
Joni Moyer
Highmark
Storage Systems
Work:(717)302-6603
Fax:(717)302-5974
joni.moyer AT highmark DOT com
********************************
"David E
Ehresman"
<deehre01@LOUISVI To
LLE.EDU> ADSM-L AT VM.MARIST DOT EDU
Sent by: "ADSM: cc
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.EDU>
08/17/2005 08:09
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Please respond to
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>We back up around 220 Gb of data to the disk pool overnight, then migrate
>(with caching on) to cartridge in the morning.
>
I assume you mean TSM storage pool caching rather than 3390 caching. If
so, I'd turn off caching for a day and see if that makes a difference. It
is my understanding that TSM caching, while optimizing restore times, can
cause performance problems in other TSM areas.
David
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