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 ([EMAIL PROTECTED]) Office 262.521.5627
________________________________ From: ADSM: Dist Stor Manager on behalf of Joni Moyer Sent: Wed 8/17/2005 08:23 To: [email protected] 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 [EMAIL PROTECTED] ******************************** "Stapleton, Mark" <[EMAIL PROTECTED] ERBEE.COM> To Sent by: "ADSM: [email protected] Dist Stor cc Manager" <[EMAIL PROTECTED] Subject .EDU> Re: AW: [ADSM-L] Migration Speed Has Plummeted 08/17/2005 09:15 AM Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED] .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 ([EMAIL PROTECTED]) Office 262.521.5627 ________________________________ From: ADSM: Dist Stor Manager on behalf of Joni Moyer Sent: Wed 8/17/2005 08:02 To: [email protected] 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 [EMAIL PROTECTED] ******************************** "Michael Garnebode" <Michael.Garnebod To [EMAIL PROTECTED]> [email protected] Sent by: "ADSM: cc Dist Stor Manager" Subject <[EMAIL PROTECTED] AW: [ADSM-L] Migration Speed Has .EDU> Plummeted 08/17/2005 08:24 AM Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED] .EDU> 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:[EMAIL PROTECTED] Im Auftrag von Joni Moyer Gesendet: Mittwoch, 17. August 2005 14:19 An: [email protected] 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 [EMAIL PROTECTED] ******************************** "David E Ehresman" <[EMAIL PROTECTED] To LLE.EDU> [email protected] Sent by: "ADSM: cc Dist Stor Manager" Subject <[EMAIL PROTECTED] Re: Migration Speed Has Plummeted .EDU> 08/17/2005 08:09 AM Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED] .EDU> >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
