TSM for OS/390 poll
I am getting ready to reorganize my TSM on OS/390 configuration and was wondering how everyone else does it ? For those folks running TSM on OS/390: 1. Do you MIRROR your DB ? If not, why not ? 2. Is/was there a noticable difference/benefit when you first MIRRORed the DB ? Or did you start out MIRRORed ? 3. How big is your DB ? Mine is currently 17GB and complaining about being over 85% utilized 4. What if any pitfalls/negatives to MIRRORed DBs ? === Zoltan Forray Virginia Commonwealth University University Computing Center e-mail: [EMAIL PROTECTED] voice: 804-828-4807
Re: TSM for OS/390 poll
I am getting ready to reorganize my TSM on OS/390 configuration and was wondering how everyone else does it ? For those folks running TSM on OS/390: 1. Do you MIRROR your DB ? If not, why not ? No. We are comfortable with the reliability of the mainframe DASD and it's own recovery. 2. Is/was there a noticable difference/benefit when you first MIRRORed the DB ? Or did you start out MIRRORed ? Never mirrored. 3. How big is your DB ? Mine is currently 17GB and complaining about being over 85% utilized Our TSM DB is 37.5gb 73% utilization. 4. What if any pitfalls/negatives to MIRRORed DBs ? I can't answer that question as we were never mirrored. === Zoltan Forray Virginia Commonwealth University University Computing Center e-mail: [EMAIL PROTECTED] voice: 804-828-4807
Re: TSM for OS/390 poll
Maybe I should have clarified my intent. The reason I am looking into mirroring is for PERFORMANCE, not necessarily recovery. When I went to my first ADSM class, they talked about mirroring for performance (although for the life of me, I could not understand how having to perform 2-write operations versus 1, would speed anything up. Yes, I realize the read part should be faster since numerous read operations could be spread over the 2-mirrors ). We too are completely raided. DASD/hardware issues are not the concern. Brian L. Nick [EMAIL PROTECTED] Sent by: ADSM: Dist Stor Manager [EMAIL PROTECTED] 08/28/2001 02:09 PM Please respond to ADSM: Dist Stor Manager To: [EMAIL PROTECTED] cc: Subject:Re: TSM for OS/390 poll I am getting ready to reorganize my TSM on OS/390 configuration and was wondering how everyone else does it ? For those folks running TSM on OS/390: 1. Do you MIRROR your DB ? If not, why not ? No. We are comfortable with the reliability of the mainframe DASD and it's own recovery. 2. Is/was there a noticable difference/benefit when you first MIRRORed the DB ? Or did you start out MIRRORed ? Never mirrored. 3. How big is your DB ? Mine is currently 17GB and complaining about being over 85% utilized Our TSM DB is 37.5gb 73% utilization. 4. What if any pitfalls/negatives to MIRRORed DBs ? I can't answer that question as we were never mirrored. === Zoltan Forray Virginia Commonwealth University University Computing Center e-mail: [EMAIL PROTECTED] voice: 804-828-4807
AW: TSM for OS/390 poll
We have a 16 GB at 65% filled. No mirroring, but we got a large performance hit after using the MVS stripping feature (every VSAM dataset spread over 16 volumes). The performance gain was about 30% for some large sql selects With regards Stefan Holzwarth -Ursprüngliche Nachricht- Von: Zoltan Forray/AC/VCU [mailto:[EMAIL PROTECTED]] Gesendet am: Dienstag, 28. August 2001 19:57 An: [EMAIL PROTECTED] Betreff: TSM for OS/390 poll I am getting ready to reorganize my TSM on OS/390 configuration and was wondering how everyone else does it ? For those folks running TSM on OS/390: 1. Do you MIRROR your DB ? If not, why not ? 2. Is/was there a noticable difference/benefit when you first MIRRORed the DB ? Or did you start out MIRRORed ? 3. How big is your DB ? Mine is currently 17GB and complaining about being over 85% utilized 4. What if any pitfalls/negatives to MIRRORed DBs ? === Zoltan Forray Virginia Commonwealth University University Computing Center e-mail: [EMAIL PROTECTED] voice: 804-828-4807
