search for: metaslabs

...is_log: 0 DTL: 262 create_txg: 51740 Uberblock: magic = 0000000000bab10c version = 22 txg = 464265 guid_sum = 6102932533008274672 timestamp = 1289468487 UTC = Thu Nov 11 10:41:27 2010 All DDTs are empty Metaslabs: vdev 0 metaslabs 101 offset spacemap free --------------- ------------------- --------------- ------------- metaslab 0 offset 0 spacemap 26 free 0 segments...

...ded by HDS arrays. Is there any effort to minimize the number of provisioned disk blocks that get writes so as to not negate any space benefits that thin provisioning may give? Background & more detailed questions: In Jeff Bonwick''s blog[1], he talks about free space management and metaslabs. Of particular interest is the statement: "ZFS divides the space on each virtual device into a few hundred regions called metaslabs." 1. http://blogs.sun.com/bonwick/entry/space_maps In Hu Yoshida''s (CTO, Hitachi Data Systems) blog[2] there is a discussion of thin provisioning...

Running a zpool scrub on our production pool is showing a scrub rate of about 400K/s. (When this pool was first set up we saw rates in the MB/s range during a scrub). Both zpool iostat and an iostat -Xn show lots of idle disk times, no above average service times, no abnormally high busy percentages. Load on the box is .59. 8 x 3GHz, 32GB ram, 96 spindles arranged into raidz zdevs on OI 147.

I was wondering if it''s planned to give some control over the metaslab allocation into the hands of the user. What I have in mind is an attribute on a ZFS filesystem that acts as modifier to the allocator. Scenarios for this would be directly controlling performance characteristics, e.g. having system and application files being allocated on the inner side of the platter while pushing

...est that: 1. in sync phase when for the first time we did not found block we need ( for example 128k ), pool schould remember this for some time ( 5 minutes ) and stop asking for this kind of blocks. 2. We should be more careful with unloading space maps. At the end of sync phase space maps for metaslabs without active flag are unloaded. On my fragmented pool spacemap with 800MB space available ( from 2GB ) is unloaded because there was no 128K blocks. This message posted from opensolaris.org

Author: billm Repository: /hg/zfs-crypto/gate Revision: 33640e100342f4a847c599f1a1671dda6faf4e05 Log message: 6410698 ZFS metadata needs to be more highly replicated (ditto blocks) 6410700 zdb should support reading raw blocks out of storage pool 6410709 ztest: spa config can change before pool export Files: update: usr/src/cmd/mdb/common/modules/zfs/zfs.c update: usr/src/cmd/zdb/zdb.c update:

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 zpool and zfs report different free space because zfs takes into account an internal reservation of 32MB or 1/64 of the capacity of the pool, what is bigger. So in a 2TB Harddisk, the reservation would be 32 gigabytes. Seems a bit excessive to me... - -- Jesus Cea Avion _/_/ _/_/_/ _/_/_/ jcea at jcea.es -

...blocks. The result is that it can take several minutes for an spa_sync() to complete, even if I''m only writing a single 128KB block. Using DTrace, I can see that space_map_alloc() frequently returns -1 for 128KB blocks. From my understanding of the ZFS code, that means that one or more metaslabs has no 128KB blocks available. Because of that, it seems to be spending a lot of time going through different space maps which aren''t able to all be cached in RAM at the same time, thus causing bad performance as it has to read from the disks. The on-disk space map size seems to be about...

Hi there! I am new to the list, and to OpenSolaris, as well as ZPS. I am creating a zpool/zfs to use on my NAS server, and basically I want some redundancy for my files/media. What I am looking to do, is get a bunch of 2TB drives, and mount them mirrored, and in a zpool so that I don''t have to worry about running out of room. (I know, pretty typical I guess). My problem is, is that

Apologies for the blank message (if it came through). I have heard here and there that there might be in development a plan to make it such that a raid-z can grow its "raid-z''ness" to accommodate a new disk added to it. Example: I have 4Disks in a raid-z[12] configuration. I am uncomfortably low on space, and would like to add a 5th disk. The idea is to pop in disk 5 and have

I''m migrating to ZFS and Solaris for cluster computing storage, and have some completely static data sets that need to be as fast as possible. One of the scenarios I''m testing is the addition of vdevs to a pool. Starting out, I populated a pool that had 4 vdevs. Then, I added 3 more vdevs and would like to balance this data across the pool for performance. The data may be

Does ZFS currently attempt to group metadata in large sector-ranges on the disk? Can this be expected to happen "automagically" - i.e. during each TXG close we have to COW-update whole branches of the blockpointer tree, so these new blocks might "just happen" to always coalesce into larger sector groups? Rationale: larger regions dedicated to smallish block pointers might be

Hi I know some of this has been discussed in the past but I can''t quite find the exact information I''m seeking (and I''d check the ZFS wikis but the websites are down at the moment). Firstly, which is correct, free space shown by "zfs list" or by "zpool iostat" ? zfs list: used 50.3 TB, free 13.7 TB, total = 64 TB, free = 21.4% zpool iostat: used

Hi. System is snv_56 sun4u sparc SUNW,Sun-Fire-V440, zil_disable=1 We see many operation on nfs clients to that server really slow (like 90 seconds for unlink()). It''s not a problem with network, there''s also plenty oc CPU available. Storage isn''t saturated either. First strange thing - normally on that server nfsd has about 1500-2500 number of threads. I did

I''m moving some data off an old machine to something reasonably new. Normally, the new machine performs better, but I have one case just now where the new system is terribly slow. Old machine - V880 (Solaris 8) with SVM raid-5: # ptime du -kds foo 15043722 foo real 6.955 user 0.964 sys 5.492 And now the new machine - T5140 (latest Solaris 10) with ZFS

Hi, guys, I have add devid support for EFI, (not putback yet) and test it with a zfs mirror, now the mirror can recover even a usb harddisk is unplugged and replugged into a different usb port. But there is still something need to improve. I''m far from zfs expert, correct me if I''m wrong. First, zfs should sense the hotplug event. I use zfs status to check the status of the

We''re running a Cyrus IMAP server on a T2000 under Solaris 10 with about 1 TB of mailboxes on ZFS filesystems. Recently, when under load, we''ve had incidents where IMAP operations became very slow. The general symptoms are that the number of imapd, pop3d, and lmtpd processes increases, the CPU load average increases, but the ZFS I/O bandwidth decreases. At the same time, ZFS

A) Resilver = Defrag. True/false? B) If I buy larger drives and resilver, does defrag happen? C) Does zfs send zfs receive mean it will defrag? -- This message posted from opensolaris.org

I''ve hit this bug on four of my Solaris 11 servers. Looking for anyone else who has seen it, as well as comments/speculation on cause. This bug is pretty bad. If you are lucky you can import the pool read-only and migrate it elsewhere. I''ve also tried setting zfs:zfs_recover=1,aok=1 with varying results. http://docs.oracle.com/cd/E26502_01/html/E28978/gmkgj.html#scrolltoc

Hi All, Its been a while since I touched zfs. Is the below still the case with zfs and hardware raid array? Do we still need to provide two luns from the hardware raid then zfs mirror those two luns? http://www.opensolaris.org/os/community/zfs/faq/#hardwareraid Thanks, Shawn -- This message posted from opensolaris.org