search for: uberblock

...blocks to verify checksums and verify nothing leaked ... Assertion failed: dmu_read(os, smo->smo_object, offset, size, entry_map) == 0 (0x5 == 0x0), file ../../../uts/common/fs/zfs/space_map.c, line 319 Abort (core dumped) I''ve read Victor''s suggestion to invalidate the active uberblock, forcing ZFS to use an older uberblock and thereby recovering the pool. However I don''t know how to figure the offset to the uberblock. I have the following information from zdb. root at kestrel:/opt$ zdb -U -uuuv zones Uberblock magic = 0000000000bab10c version = 4...

Hello all, I found this dialog on the zfs-devel at zfsonlinux.org list, and I''d like someone to confirm-or-reject the discussed statement. Paraphrasing in my words and understanding: "Labels, including Uberblock rings, are fixed 256KB in size each, of which 128KB is the UB ring. Normally there is 1KB of data in one UB, which gives 128 TXGs to rollback to. When ashift=12 is used for 4k-sector disks, each UB is allocated a 4KB block, of which 3KB is padding. And now we only have 32 TXGs of ro...

ZFS documentation lists snapshot limits on any single file system in a pool at 2**48 snaps, and that seems to logically imply that a snap on a file system does not require an update to the pool?s currently active uberblock. That is to say, that if we take a snapshot of a file system in a pool, and then make any changes to that file system, the copy on write behavior induced by the changes will stop at some synchronization point below the uberblock (presumably at or below the DNODE that is the DSL directory for that...

Hi, my system (solaris b77) was physically destroyed and i loosed data saved in a zpool mirror. The only thing left is a dettached vdev from the pool. I''m aware that uberblock is gone and that i can''t import the pool. But i still hope their is a way or a tool (like tct http://www.porcupine.org/forensics/) i can go too recover at least partially some data) thanks in advance for any hints. bbr This message posted from opensolaris.org

Tuning should not be done in general and Best practices should be followed. So get very much acquainted with this first : http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide Then if you must, this could soothe or sting : http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide So drive carefully. -r

...ry spread in multiple subfolders) Today I found that not only zpool upgrade exist, but also zfs upgrade, most filesystems are still version 1 while some new are already version 3. Running zdb we also saw there is a mismatchs in version information, our storage pool is list as version 3 while the uberblock is at version 9, when we run zpool upgrade, it tells us all pools are upgraded to latest version. below the zdb output: zdb stor ????version=3 ????name=''stor'' ????state=0 ????txg=6559447 ????pool_guid=14464037545511218493 ????hostid=341941495 ????hostname=''files...

Has anyone worked with a x4500/x4540 and know if the internal raid controllers have a bbu? I''m concern that we won''t be able to turn off the write-cache on the internal hds and SSDs to prevent data corruption in case of a power failure. -- This message posted from opensolaris.org

...i should have enough online devices to mount and get my data off however no luck. I''m not really sure where to go at this point. Do i have to fake a c0t3d0 drive so it thinks all drives are there? Can somebody point me in the right direction? thanks, liam p.s. To help me find which uberblocks to modify to reset the tgx i wrote a little perl program which finds and prints out information in order to revert to an earlier tgx value. Its a little messy since i wrote it super late at night quickly - but maybe it will help somebody else out. http://liam821.com/findUberBlock.txt (its just a...

Hello, I''ve looked around Google and the zfs-discuss archives but have not been able to find a good answer to this question (and the related questions that follow it): How well does ZFS handle unexpected power failures? (e.g. environmental power failures, power supply dying, etc.) Does it consistently gracefully recover? Should having a UPS be considered a (strong) recommendation or

...> complicated RFE would be to detect this as a self-consistent > version of > the same pool, and have a way to change the GUID on import. > > If you export the pool before you poweroff the host, and then want to > import one of the two pools, the version with the most recent > uberblock > will "win". If they both have the same uberblock (i.e. are really the > identical mirror), the results are non-deterministic. Depending > on the > order in which devices are discovered, you may end up with one pool or > the other, or some combination of both. ah .. th...

Hi, If I add an entire disk to a new pool by doing "zpool create", is this reversible? I.e. if there was data on that disk (e.g. it was the sole disk in a zpool in another system) can I get this back or is zpool create destructive? Joubert This message posted from opensolaris.org

...there is no way to backup raw disks before starting more experiments, that''s why I''m writting here. I''ve two ideas: 1. Because it happend on system crash or something, we can expect that this is caused by the last change. If so, we could try corrupting most recent uberblock, so ZFS will pick up previous uberblock. 2. Instead of pancing in space_map_add(), we could try to space_map_remove() the offensive entry, eg: - VERIFY(ss == NULL); + if (ss != NULL) { + space_map_remove(sm, ss->ss_start, ss->ss_end); + goto again; + } Both of those ideas can make thi...

OK, I am a butt-head and accidentally destroyed my last snapshot of a replicated ZFS dataset. The dataset is NOT mounted and other than a resilver going on, there is no I/O going on to this dataset. Is there any way to roll back and get my latest snapshot back? from zpool history -i: 2012-06-18.10:34:00 zfs destroy xxx at 1339668001 2012-06-18.10:34:00 [internal destroy txg:2213852] dataset =

...ATE_ACTIVE" poolstatus="ZPOOL_STATUS_VERSION_OLDER" ... Somebody is trying to tell me something, but I''m not receiving. All four disks (there were only ever four in the array, since creation until the present) appear present, are readable (via dd if=...), have sane looking uberblock arrays, and give more or less sane looking answers to "zdb -l /dev/dsk/..."; the whole output of the latter is a bit much to paste here but I can if somebody thinks it would be useful. zdb with no arguments also enumerates the pool in the list and looks saneish. Other zdb commands appar...

I would like to pick the brains of the ZFS experts on this list: What would you do next to try and recover this zfs pool? I have a ZFS RAIDZ1 pool named bank0 that I cannot import. It was composed of 4 1.5 TiB disks. One disk is totally dead. Another had SMART errors, but using GNU ddrescue I was able to copy all the data off successfully. I have copied all 3 remaining disks as images using

I have three zpools on a server and want to add a mirrored pair of ssd''s for the ZIL. Can the same pair of SSDs be used for the ZIL of all three zpools or is it one ZIL SLOG device per zpool? -- This message posted from opensolaris.org

I have a lot of people whispering "zfs" in my virtual ear these days, and at the same time I have an irrational attachment to xfs based entirely on its lack of the 32000 subdirectory limit. I''m not afraid of ext4''s newness, since really a lot of that stuff has been in Lustre for years. So a-benchmarking I went. Results at the bottom:

We''re currently designing a ZFS fileserver environment with iSCSI based storage (for failover, cost, ease of expansion, and so on). As part of this we would like to use multipathing for extra reliability, and I am not sure how we want to configure it. Our iSCSI backend only supports multiple sessions per target, not multiple connections per session (and my understanding is that the

...Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* + * Copyright (c) 2012 by Delphix. All rights reserved. + * Copyright (c) 2013 by Saso Kiselkov. All rights reserved. + */ + +/* * The zfs plug-in routines for GRUB are: * * zfs_mount() - locates a valid uberblock of the root pool and reads @@ -69,7 +75,18 @@ decomp_entry_t decomp_table[ZIO_COMPRESS {"on", lzjb_decompress}, /* ZIO_COMPRESS_ON */ {"off", 0}, /* ZIO_COMPRESS_OFF */ {"lzjb", lzjb_decompress}, /* ZIO_COMPRESS_LZJB */ - {"empty", 0} /* ZIO_COMPRE...

...y checksums. The document does not state anything about it, so I guess the labels are only protected by 4-way redundancy - that''s it?.. 4) As I asked today in thread "How many rollback TXGs in a ring for 4k drives?", there was an understanding by our Linux-ZFS comrades that each uberblock takes up some amount of disk blocks, with minimal allocation based on ashift value; thus on ashift=12 pools there are only 32 rollback TXGs. The PDF spec (section 1.3 overview) states that each UB entry size is 1KB as part of the label structure; does this mean that for ashift=12 pools there are 1...