similar to: Multiple SLOG devices per pool

Hi I''m running OpenSolaris 148 on a few boxes, and newer boxes are getting installed as we speak. What would you suggest for a good SLOG device? It seems some new PCI-E-based ones are hitting the market, but will those require special drivers? Cost is obviously alsoo an issue here.... Vennlige hilsener / Best regards roy -- Roy Sigurd Karlsbakk (+47) 97542685 roy at karlsbakk.net

Hey folks, This might be a daft idea, but is there any way to shut down solaris / zfs without flushing the slog device? The reason I ask is that we''re planning to use mirrored nvram slogs, and in the long term hope to use a pair of 80GB ioDrives. I''d like to have a large amount of that reserved for write cache (potentially 20-30GB), to facilitate rapid suspend to disk of

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

Hi, Out of pure curiosity, I was wondering, what would happen if one tries to use a regular 7200RPM (or 10K) drive as slog or L2ARC (or both)? I know these are designed with SSDs in mind, and I know it''s possible to use anything you want as cache. So would ZFS benefit from it? Would it be the same? Would it slow down? I guess it would slow things down, because it would be trying to

The standard controller that has been recommended in the past is the AOC-SAT2-MV8 - an 8 port with a marvel chipset. There have been several mentions of LSI based controllers on the mailing lists and I''m wondering about them. One obvious difference is that the Marvel contoller is PCI-X and the LSI controllers are PCI-E. Supermicro have several LSI controllers. AOC-USASLP-L8i with the

Hello all... I''m seeing this behaviour in an old build (89), and i just want to hear from you if there is some known bug about it. I''m aware of the "picket fencing" problem, and that ZFS is not choosing right if write to slog is better or not (thinking if we have a better throughput from disks). But i did not find anything about 100% slog activity (~115MB/s) blocks

This past weekend, but holiday was ruined due to a log device "replacement" gone awry. I posted all about it here: http://jmlittle.blogspot.com/2008/05/problem-with-slogs-how-i-lost.html In a nutshell, an resilver of a single log device with itself, due to the fact one can''t remove a log device from a pool once defined, cause ZFS to fully resilver but then attach the log

Recently, I''ve been reading through the ZIL/slog discussion and have the impression that a lot of folks here are (like me) interested in getting a viable solution for a cheap, fast and reliable ZIL device. I think I can provide such a solution for about $200, but it involves a lot of development work. The basic idea: the main problem when using a HDD as a ZIL device are the cache flushes

Hi, I don''t know if it''s already been discussed here, but while thinking about using the OCZ Vertex 2 Pro SSD (which according to spec page has supercaps built in) as a shared slog and L2ARC device it stroke me that this might not be a such a good idea. Because this SSD is MLC based, write cycles are an issue here, though I can''t find any number in their spec. Why do I

Hello, I''ve looked quickly through the archives and haven''t found mention of this issue. I''m running SXCE (snv_99), which I believe uses zfs version 13. I had an existing zpool: -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20081026/a5e2f25b/attachment.html>

I have a 24 x 1TB system being used as an NFS file server. Seagate SAS disks connected via an LSI 9211-8i SAS controller, disk layout 2 x 11 disk RAIDZ2 + 2 spares. I am using 2 x DDR Drive X1s as the ZIL. When we write anything to it, the writes are always very bursty like this: ool 488K 20.0T 0 0 0 0 xpool 488K 20.0T 0 0 0 0 xpool

Hello list, someone (actually neil perrin (CC)) mentioned in this thread: http://mail.opensolaris.org/pipermail/zfs-discuss/2009-December/034340.html that is should be possible to import a pool with failed log devices (with or without data loss ?). >/ />/ Has the following error no consequences? />/ />/ Bug ID 6538021 />/ Synopsis Need a way to force pool startup when

Hi, I'm evaluating to switch from NetApp to a ZFS appliance (like Qsan). Our setup is Dovecot, Maildir for email storage and NFS to share mailboxes (more than 30k users) across POP/IMAP and MX servers. NetApp NFS works fine also under high load but have some limitation for inode numbers per Volume and is expensive (but recently their prices have dropped). ZFS, I read, suggest to create

Hi!We''re trying to pinpoint our performance issues and we could use all the help to community can provide. We''re running the latest version of Nexenta on a pretty powerful machine (4x Xeon 7550, 256GB RAM, 12x 100GB Samsung SSDs for the cache, 50GB Samsung SSD for the ZIL, 10GbE on a dedicated switch, 11x pairs of 15K HDDs for the pool). We''re connecting a single Linux

Are any of you using the Intel 320 as ZIL? It''s MLC based, but I understand its wear and performance characteristics can be bumped up significantly by increasing the overprovisioning to 20% (dropping usable capacity to 80%). Anyone have experience with this? Ray

zdb -C shows an shift value on each vdev in my pool, I was just wondering if it is vdev specific, or pool wide. Google didn''t seem to know. I''m considering a mixed pool with some "advanced format" (4KB sector) drives, and some normal 512B sector drives, and was wondering if the ashift can be set per vdev, or only per pool. Theoretically, this would save me some size on

Hello, Im about to migrate a 6Tb database from Veritas Volume Manager to ZFS, I want to set arc_max parameter so ZFS cant use all my system''s memory, but i dont know how much i should set, do you think 24Gb will be enough for a 6Tb database? obviously the more the better but i cant set too much memory. Have someone implemented succesfully something similar? We ran some test and the

So what does everyone out there use to generate web statistics these days? Are the tried and true awstats or webalizer still the best out there? Ray

Hello list, while following this list for more then 1 year, I feel that this list was a great way to get insights into ZFS. Thank you all for contributing. Over the last month''s I was writing a little "whitepaper" trying to consolidate the knowledge collected here. It has now reached a "beta" state and I would like to share the result with you. I call it -

So, when you add a log device to a pool, it initiates a resilver. What is it actually doing, though? Isn''t the slog a copy of the in-memory intent log? Wouldn''t it just simply replicate the data that''s in the other log, checked against what''s in RAM? And presumably there isn''t that much data in the slog so there isn''t that much to check? Or