Re: allocating disk volumes on RAID5 array

4 AM To: [EMAIL PROTECTED] Subject: Re: allocating disk volumes on RAID5 array I'm curious if anyone feels that the new AIXDIRECTIO option in TSM 5.1 affects their opinions about how to utilize disk for storage pools. TSM 5.1 also has an Async I/O option (AIX). For more info, refer to <http

Re: allocating disk volumes on RAID5 array

dnesday, May 29, 2002 3:56 AM To: [EMAIL PROTECTED] Subject: Re: allocating disk volumes on RAID5 array > ... I rather NOT use RAID-5 for TSM disk pool volumes... Why pay the penalty for calc & writing parity when you don't expect to read it more than once?!? This data is so transient

Re: allocating disk volumes on RAID5 array

Sent by: "ADSM: Subject: Re: allocating disk volumes on RAID5 array Dist Stor

Re: allocating disk volumes on RAID5 array

gt; To: [EMAIL PROTECTED] cc: Subject: Re: allocating disk volumes on RAID5 array Zlatko, > Write rate for RAID 5 is (note) again > N times faster than single disk speed but decreases with penalty for > recalculation if parity (highly controller dependent) Often this calcula

Re: allocating disk volumes on RAID5 array

I'm curious if anyone feels that the new AIXDIRECTIO option in TSM 5.1 affects their opinions about how to utilize disk for storage pools. TSM 5.1 also has an Async I/O option (AIX). For more info, refer to , starting at about page 107. T

Re: allocating disk volumes on RAID5 array

nation under same address -> support -> raid level description. regards Juraj -Original Message- From: Zlatko Krastev [mailto:[EMAIL PROTECTED]] Sent: Wednesday, May 29, 2002 7:56 AM To: [EMAIL PROTECTED] Subject: Re: allocating disk volumes on RAID5 array Quick answer - only one

Re: allocating disk volumes on RAID5 array

Zlatko Krastev IT Consultant Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> Sent by:"ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject:allocating disk volumes on RAID5 array Since a RAID-5 arra

Re: allocating disk volumes on RAID5 array

ECTED]> Sent by:"ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject:Re: allocating disk volumes on RAID5 array Wanda has identified the critical choices; there is no single, right answer because the performance factors intersect at

Re: allocating disk volumes on RAID5 array

: Re: allocating disk volumes on RAID5 array I agree with Don, I prefer non-protected RAID-0 stripping for TSM disk pools. That is unless it a unique type of data that is not re-creatable such as backup logs. -- Joshua S. Bassi Sr. Solutions Architect @ rs-unix.com IBM Certified - AIX 4/5L, SAN

Re: allocating disk volumes on RAID5 array

HACMP Tivoli Certified Consultant- ADSM/TSM Cell (415) 215-0326 -Original Message- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]] On Behalf Of Don France Sent: Tuesday, May 28, 2002 5:31 PM To: [EMAIL PROTECTED] Subject: Re: allocating disk volumes on RAID5 array Wanda has identified

Re: allocating disk volumes on RAID5 array

:[EMAIL PROTECTED]]On Behalf Of Gerald Wichmann Sent: Tuesday, May 28, 2002 3:30 PM To: [EMAIL PROTECTED] Subject: Re: allocating disk volumes on RAID5 array That's more along the lines of what kind of info I'm digging for - but doesn't quite address how one goes about coming up with a

Re: allocating disk volumes on RAID5 array

sday, May 28, 2002 2:38 PM To: [EMAIL PROTECTED] Subject: Re: allocating disk volumes on RAID5 array Well yes, it does matter. Trouble is, there is no "right" answer. It's a performance thing. Assuming you have multiple clients backing up concurrently to your disk pool, TSM will sta

Re: allocating disk volumes on RAID5 array

=> On Tue, 28 May 2002 14:01:25 -0700, Gerald Wichmann <[EMAIL PROTECTED]> said: > Bottom line is I was just speculating out loud perhaps on whether there were > any pro's or con's to how many volumes and what size one would make the > volumes on a RAID5 array. Say you had a 100GB RAID5 array. Wo

Re: allocating disk volumes on RAID5 array

e it's all just going into a big array? Regards, Gerald Wichmann Senior Systems Development Engineer Zantaz, Inc. 925.598.3099 (w) -----Original Message- From: Gianluca Perilli [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 28, 2002 1:35 PM To: [EMAIL PROTECTED] Subject: Re: allocating disk volu

Re: allocating disk volumes on RAID5 array

bject: Re: allocating disk volumes on RAID5 array Dist Stor

Re: allocating disk volumes on RAID5 array

er Zantaz, Inc. 925.598.3099 (w) -Original Message- From: Gianluca Perilli [mailto:[EMAIL PROTECTED]] Sent: Tuesday, May 28, 2002 1:35 PM To: [EMAIL PROTECTED] Subject: Re: allocating disk volumes on RAID5 array Hi Gerald, I think you have to consider that if you use RAID5 logical drives, yo

Re: allocating disk volumes on RAID5 array

: "ADSM: Subject: allocating disk volumes on RAID5 array Dist Stor Ma

Re: allocating disk volumes on RAID5 array

You don't want to create one big RAID-5 disk. If you plan to have say 100GB disk pool, I would create say 10 RAID-5 disks - unless the number and size of disk you have means you need bigger Raid arrays. Also create filesystems on separate disks (UNIX system?) for disk pool vols. Reason is for b

allocating disk volumes on RAID5 array

Since a RAID-5 array shows up as one big filesystem, what's the best strategy for determining how many and of what size disk pool volumes to create for your primary disk storage pool? For the most part I don't think it really matters unlike allocating volumes on individual disks but perhaps I'm no