>Preface: yes, shrink will be cool. But we've been running highly available, >mission critical datacenters for more than 50 years without shrink being >widely available.
Agreed, and shrink IS cool, I used it to migrate VxVM volumes from direct attached storage to slightly smaller SAN LUNS on a solaris sparc box. It sure is nice to add the new storage to the volume and mirror as opposed to copying to a new filesystem. It will be cool when SSDs are released for my fully loaded x4540s, if I can migrate enough users off and shrink the pool perhaps I can drop a couple of SATA disks and then add the SSDs, all on the fly. Perhaps Steve Martin said it best, "Let's get real small!". Thanks, Jordan On Wed, Aug 5, 2009 at 12:47 PM, Richard Elling <richard.ell...@gmail.com>wrote: > Preface: yes, shrink will be cool. But we've been running highly > available, > mission critical datacenters for more than 50 years without shrink being > widely available. > > On Aug 5, 2009, at 9:17 AM, Martin wrote: > >> You are the 2nd customer I've ever heard of to use shrink. >>> >> >> This attitude seems to be a common theme in ZFS discussions: "No >> enterprise uses shrink, only grow." >> >> Maybe. The enterprise I work for requires that every change be reversible >> and repeatable. Every change requires a backout plan and that plan better >> be fast and nondisruptive. >> > > Do it exactly the same way you do it for UFS. You've been using UFS > for years without shrink, right? Surely you have procedures in place :-) > > Who are these enterprise admins who can honestly state that they have no >> requirement to reverse operations? >> > > Backout plans are not always simple reversals. A well managed site will > have procedures for rolling upgrades. > > Who runs a 24x7 storage system and will look you in the eye and state, >> "The storage decisions (parity count, number of devices in a stripe, etc.) >> that I make today will be valid until the end of time and will NEVER need >> nondisruptive adjustment. Every storage decision I made in 1993 when we >> first installed RAID is still correct and has needed no changes despite >> changes in our business models." >> >> My experience is that this attitude about enterprise storage borders on >> insane. >> >> Something does not compute. >> > > There is more than one way to skin a cat. > -- richard > > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >
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