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Illumos 5027 - zfs large block support

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5027 zfs large block support
Reviewed by: Alek Pinchuk <pinchuk.alek@gmail.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Josef 'Jeff' Sipek <josef.sipek@nexenta.com>
Reviewed by: Richard Elling <richard.elling@richardelling.com>
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Approved by: Dan McDonald <danmcd@omniti.com>

References:
  https://www.illumos.org/issues/5027
  https://github.com/illumos/illumos-gate/commit/b515258

Porting Notes:

* Included in this patch is a tiny ISP2() cleanup in zio_init() from
Illumos 5255.

* Unlike the upstream Illumos commit this patch does not impose an
arbitrary 128K block size limit on volumes.  Volumes, like filesystems,
are limited by the zfs_max_recordsize=1M module option.

* By default the maximum record size is limited to 1M by the module
option zfs_max_recordsize.  This value may be safely increased up to
16M which is the largest block size supported by the on-disk format.
At the moment, 1M blocks clearly offer a significant performance
improvement but the benefits of going beyond this for the majority
of workloads are less clear.

* The illumos version of this patch increased DMU_MAX_ACCESS to 32M.
This was determined not to be large enough when using 16M blocks
because the zfs_make_xattrdir() function will fail (EFBIG) when
assigning a TX.  This was immediately observed under Linux because
all newly created files must have a security xattr created and
that was failing.  Therefore, we've set DMU_MAX_ACCESS to 64M.

* On 32-bit platforms a hard limit of 1M is set for blocks due
to the limited virtual address space.  We should be able to relax
this one the ABD patches are merged.

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #354
This commit is contained in:
Matthew Ahrens
2014-11-03 12:15:08 -08:00
committed by Brian Behlendorf
parent 3df293404a
commit f1512ee61e
55 changed files with 613 additions and 155 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cmd/zfs/zfs_main.c
+8 -3
View File
@@ -258,9 +258,9 @@ get_usage(zfs_help_t idx)
case HELP_ROLLBACK:
return (gettext("\trollback [-rRf] <snapshot>\n"));
case HELP_SEND:
return (gettext("\tsend [-DnPpRrve] [-[iI] snapshot] "
return (gettext("\tsend [-DnPpRvLe] [-[iI] snapshot] "
"<snapshot>\n"
"\tsend [-e] [-i snapshot|bookmark] "
"\tsend [-Le] [-i snapshot|bookmark] "
"<filesystem|volume|snapshot>\n"));
case HELP_SET:
return (gettext("\tset <property=value> "
@@ -3683,7 +3683,7 @@ zfs_do_send(int argc, char **argv)
boolean_t extraverbose = B_FALSE;
/* check options */
while ((c = getopt(argc, argv, ":i:I:RDpvnPe")) != -1) {
while ((c = getopt(argc, argv, ":i:I:RDpvnPLe")) != -1) {
switch (c) {
case 'i':
if (fromname)
@@ -3718,6 +3718,9 @@ zfs_do_send(int argc, char **argv)
case 'n':
flags.dryrun = B_TRUE;
break;
case 'L':
flags.largeblock = B_TRUE;
break;
case 'e':
flags.embed_data = B_TRUE;
break;
@@ -3774,6 +3777,8 @@ zfs_do_send(int argc, char **argv)
if (zhp == NULL)
return (1);
if (flags.largeblock)
lzc_flags |= LZC_SEND_FLAG_LARGE_BLOCK;
if (flags.embed_data)
lzc_flags |= LZC_SEND_FLAG_EMBED_DATA;