We use compression on almost all of our zpools. We see very little if any I/O slowdown because of this, and you get free disk space. In fact, I believe read I/O gets a boost from this, since decompression is cheap compared to normal disk I/O.

Jon

Dave Johnson wrote:
you mean c9n ? ;)

does anyone actually *use* compression ? i'd like to see a poll on how many people are using (or would use) compression on production systems that are larger than your little department catch-all dumping ground server. i mean, unless you had some NDMP interface directly to ZFS, daily tape backups for any large system will likely be an excersize in futility unless the systems are largely just archive servers, at which point it's probably smarter to perform backups less often, coinciding with the workflow of migrating archive data to it. otherwise wouldn't the system just plain get pounded?

-=dave

----- Original Message ----- From: "roland" <[EMAIL PROTECTED]>
To: <zfs-discuss@opensolaris.org>
Sent: Tuesday, October 16, 2007 12:44 PM
Subject: Re: [zfs-discuss] HAMMER


and what about compression?

:D


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