Comments on: USPV Review http://blog.nigelpoulton.com/uspv-review/#utm_source=feed&utm_medium=feed&utm_campaign=feed with nigel poulton Tue, 20 Dec 2011 19:37:54 +0000 http://wordpress.org/?v=2.8.6 hourly 1 By: Nigel (mackem) http://blog.nigelpoulton.com/uspv-review/comment-page-1/#comment-191 Nigel (mackem) Fri, 25 May 2007 11:54:50 +0000 http://blogs.rupturedmonkey.com/?p=89#comment-191 Lies, damned lies, and statistics ;-) Lies, damned lies, and statistics ;-)

]]> By: stephen2615 http://blog.nigelpoulton.com/uspv-review/comment-page-1/#comment-190 stephen2615 Thu, 24 May 2007 07:58:53 +0000 http://blogs.rupturedmonkey.com/?p=89#comment-190 3.5 million IOPS versus 144,000.  The former being purely cache only and the latter is what you can expect with 1152 disks using about 125 IOPS each.  At least HP admit to something like that second figure with the XP series.   This leads me to how you can have purely cache only transactions in something as big as a USP.   Would you rip out all the disks and use the 256 GB of cache to attempt a transaction?Heck, I am happy with 144,000 IOPS and anything other than that is a bonus.  So if you can shove in 2000 odd disks into a DMX 3, thats 250,000 IOPS.  Wow, thats impressive.I did stats many years ago at university as part of my computer science degree.  Stats are there purely to come up with outrageous figures.  Thats why all businesses and governments love them so much.  No one really believes outrageous claims other than CIO's who spend too much time reading executive briefs in those crumby IT specialist magazines. 3.5 million IOPS versus 144,000.  The former being purely cache only and the latter is what you can expect with 1152 disks using about 125 IOPS each.  At least HP admit to something like that second figure with the XP series.   This leads me to how you can have purely cache only transactions in something as big as a USP.   Would you rip out all the disks and use the 256 GB of cache to attempt a transaction?Heck, I am happy with 144,000 IOPS and anything other than that is a bonus.  So if you can shove in 2000 odd disks into a DMX 3, thats 250,000 IOPS.  Wow, thats impressive.I did stats many years ago at university as part of my computer science degree.  Stats are there purely to come up with outrageous figures.  Thats why all businesses and governments love them so much.  No one really believes outrageous claims other than CIO’s who spend too much time reading executive briefs in those crumby IT specialist magazines.

]]> By: akro http://blog.nigelpoulton.com/uspv-review/comment-page-1/#comment-189 akro Mon, 21 May 2007 13:25:45 +0000 http://blogs.rupturedmonkey.com/?p=89#comment-189 It would be awesome if they took some of the technology from the EVA and threw it into the Hitachi boxes.  I just want to stripe across hundreds of marketing groups, and resize on the fly.  I always wondered what would happen if you though a bunch of EVA controllers in front of a high end array.  From first glance it would seam possible. It would be awesome if they took some of the technology from the EVA and threw it into the Hitachi boxes.  I just want to stripe across hundreds of marketing groups, and resize on the fly.  I always wondered what would happen if you though a bunch of EVA controllers in front of a high end array.  From first glance it would seam possible.

]]> By: Nigel http://blog.nigelpoulton.com/uspv-review/comment-page-1/#comment-188 Nigel Fri, 18 May 2007 15:08:52 +0000 http://blogs.rupturedmonkey.com/?p=89#comment-188 <p>akro, thanks for your comment.</p> <p>It was while whizzing through the marketing bumf when I saw the reference to wider backend striping.  It definietely mentioned hundreds of disks (wider than the AG interleaving you mentioned).  Im wondering though if it was just in relation to Dynamic Provisioing pools?  I will be taking a closer look at the improvements as soon as I get a chance!</p> akro, thanks for your comment.

It was while whizzing through the marketing bumf when I saw the reference to wider backend striping.  It definietely mentioned hundreds of disks (wider than the AG interleaving you mentioned).  Im wondering though if it was just in relation to Dynamic Provisioing pools?  I will be taking a closer look at the improvements as soon as I get a chance!

]]> By: Storagezilla http://blog.nigelpoulton.com/uspv-review/comment-page-1/#comment-187 Storagezilla Tue, 15 May 2007 23:55:24 +0000 http://blogs.rupturedmonkey.com/?p=89#comment-187 There will be no debunking from EMC since it has been shipping virtual provisioning/automatic volume management since 06 in DART 5.5. It's pretty nifty for NAS volumes since it can both expand and shrink the storage pool for the FS. http://www.emc.com/techlib/pdf/H2121_cel_VP_TN_ldv.pdf One wonders if with the rise of TP we end up seeing more snaps used for backups. Block level replication also becomes a hell of a lot more interesting too. There will be no debunking from EMC since it has been shipping virtual provisioning/automatic volume management since 06 in DART 5.5. It’s pretty nifty for NAS volumes since it can both expand and shrink the storage pool for the FS.

http://www.emc.com/techlib/pdf/H2121_cel_VP_TN_ldv.pdf

One wonders if with the rise of TP we end up seeing more snaps used for backups. Block level replication also becomes a hell of a lot more interesting too.

]]> By: akro http://blog.nigelpoulton.com/uspv-review/comment-page-1/#comment-186 akro Tue, 15 May 2007 21:26:54 +0000 http://blogs.rupturedmonkey.com/?p=89#comment-186 I didn't see any new announcements about wider stripe widths but the HDS\XP have supported Group interleving for about a year.  Essentially you take 2 or 4 paity groups and your ldev is interleaved across them.  Not striped, think of it is a block level luse across multple DKA\PG. I didn’t see any new announcements about wider stripe widths but the HDS\XP have supported Group interleving for about a year.  Essentially you take 2 or 4 paity groups and your ldev is interleaved across them.  Not striped, think of it is a block level luse across multple DKA\PG.

]]> By: Chris M Evans http://blog.nigelpoulton.com/uspv-review/comment-page-1/#comment-185 Chris M Evans Tue, 15 May 2007 21:20:16 +0000 http://blogs.rupturedmonkey.com/?p=89#comment-185 Just posted a few comments myself.  All a little disappointing.  I'd like to know more about Dynamic Provisioning, however as I did some of the early beta testing on features of Iceberg (if you don't know, see STK or IBM RVA) I know thin provisioning can be a poison chalice.  Just posted a few comments myself.  All a little disappointing.  I’d like to know more about Dynamic Provisioning, however as I did some of the early beta testing on features of Iceberg (if you don’t know, see STK or IBM RVA) I know thin provisioning can be a poison chalice. 

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