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Operating Systems Solaris [Q] zpool mirror; read from preferred vdev(s) Post 302796385 by pressy on Friday 19th of April 2013 12:07:56 PM
Old 04-19-2013
Sun [Q] zpool mirror; read from preferred vdev(s)

Hallo,

Using a zpool mirror; is there a way to set something like a primary storage / preferred vdevs / read-first devices like it was in disksuite using "metaparam -r [roundrobin | geometric | first]" or the "vxvol rdpol [prefer | round | select | siteread]" to define a preferred plex in VxVM? Will ZFS always use round-robin?

In our example we want to use a brand-new fast storage with hot-data tiering (ssd-caching) mirrored/combined to an older/slower one... with round-robin we could assume that every second read will be slower?

Will the write acknowledgement be commited after both writes so we will have no advantage from the faster storage?

Thanks in advance

- pressy
 

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ZFSLOADER(8)						    BSD System Manager's Manual 					      ZFSLOADER(8)

NAME
zfsloader -- kernel bootstrapping final stage DESCRIPTION
zfsloader is an extended variant of loader(8) with added support for booting from ZFS. This document describes only differences from loader(8). ZFS FEATURES
zfsloader supports the following format for specifying ZFS filesystems which can be used wherever loader(8) refers to a device specification: zfs:pool/filesystem: where pool/filesystem is a ZFS filesystem name as described in zfs(8). If /etc/fstab does not have an entry for the root filesystem and vfs.root.mountfrom is not set, but currdev refers to a ZFS filesystem, then zfsloader will instruct kernel to use that filesystem as the root filesystem. ZFS COMMAND EXTENSIONS
lsdev [-v] Lists ZFS pools in addition to disks and partitions. Adding -v shows more ZFS pool details in a format that resembles zpool status output. lszfs filesystem A ZFS extended command that can be used to explore the ZFS filesystem hierarchy in a pool. Lists the immediate children of the filesystem. The filesystem hierarchy is rooted at a filesystem with the same name as the pool. FILES
/boot/zfsloader zfsloader itself. EXAMPLES
Set the default device used for loading a kernel from a ZFS filesystem: set currdev=zfs:tank/ROOT/knowngood: SEE ALSO
gptzfsboot(8), loader(8), zfs(8), zfsboot(8), zfsloader(8), zpool(8) HISTORY
The zfsloader first appeared in FreeBSD 7.3. AUTHORS
This manual page was written by Andriy Gapon <avg@FreeBSD.org>. BSD
September 15, 2014 BSD
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