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Support ashift=13 for 8KB SSD block sizes 

New SSDs are now available which use an internal 8k block size.
To make sure ZFS can get the maximum performance out of these
devices we're increasing the maximum ashift to 13 (8KB).

This value is still small enough that we can fit 16 uberblocks
in the vdev ring label.  However, I don't want to increase this
any futher or it will limit the ability the safely roll back a
pool to recover it.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #565
This commit is contained in:
Richard Yao 2012-02-13 10:38:58 -05:00 committed by Brian Behlendorf
parent d2e032ca9c
commit b41c9906dc
2 changed files with 2 additions and 2 deletions
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2
lib/libzfs/libzfs_pool.c
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@ -443,7 +443,7 @@ zpool_valid_proplist(libzfs_handle_t *hdl, const char *poolname,
goto error; goto error;
} }
if (intval != 0 && (intval < 9 || intval > 12)) { if (intval != 0 && (intval < 9 || intval > 13)) {
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
"property '%s' number %d is invalid."), "property '%s' number %d is invalid."),
propname, intval); propname, intval);

2
module/zcommon/zpool_prop.c
View File

@ -89,7 +89,7 @@ zpool_prop_init(void)
/* readonly onetime number properties */ /* readonly onetime number properties */
zprop_register_number(ZPOOL_PROP_ASHIFT, "ashift", 0, PROP_ONETIME, zprop_register_number(ZPOOL_PROP_ASHIFT, "ashift", 0, PROP_ONETIME,
ZFS_TYPE_POOL, "<ashift, 9-12, or 0=default>", "ASHIFT"); ZFS_TYPE_POOL, "<ashift, 9-13, or 0=default>", "ASHIFT");
/* default number properties */ /* default number properties */
zprop_register_number(ZPOOL_PROP_VERSION, "version", SPA_VERSION, zprop_register_number(ZPOOL_PROP_VERSION, "version", SPA_VERSION,