search for: slogs

Anyone know of a SATA and/or SAS HBA with battery backed write cache? Seems like using a full-blown RAID controller and exporting each individual drive back to ZFS as a single LUN is a waste of power and $$$. Looking for any thoughts or ideas. Thanks. -Matt -- This message posted from opensolaris.org

I have a pool with a single SLOG device rated at Y iops. If I add a second (non-mirrored) SLOG device also rated at Y iops will my zpool now theoretically be able to handle 2Y iops? Or close to that? Thanks, Ray

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 multiple virtual machines. I suspect there will be a few problems with this configuration though. My...

...nt 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 read/write from a single spindle instead of a multidisk array, right? I havent found any articles discussing this, only ones talking about SSD-based slogs/caches. Thanks, Hernan -- This message posted from opensolaris.org

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

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 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

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

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

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

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

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 device as as stripe to the volume, and no longer as a log device. The subsequent pool...

<ubuntu_gutsy> me@ubuntu:~/workspace/oracle/ro$ gem install activerecord-oci-adapter Bulk updating Gem source index for: http://gems.rubyforge.org ERROR: While executing gem ... (Gem::GemNotFoundException) Could not find activerecord-oci-adapter (> 0) in any repository <ubuntu_gutsy> me@ubuntu:~/workspace/oracle/ro$ rake db:migrate (in /home/me/workspace/oracle/ro) rake

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, When deploying ZFS in cluster environment it would be nice to be able to have some SSDs as local drives (not on SAN) and when pool switches over to the other node zfs would pick up the node''s local disk drives as L2ARC. To better clarify what I mean lets assume there is a 2-node cluster with 1sx 2540 disk array. Now lets put 4x SSDs in each node (as internal/local drives). Now

I''m working with a Cyrus IMAP server running on a T2000 box under Solaris 10 10/09 with current patches. Mailboxes reside on six ZFS filesystems, each containing about 200 gigabytes of data. These are part of a single zpool built on four Iscsi devices from our Netapp filer. One of these ZFS filesystems contains a number of global and per-user databases in addition to one sixth of the

I'm seeing ~100 new failures in the gcc testsuite due to the test file being doubled or tripled, as below. This appears to affect only files that were newly imported from gcc-4.2 in the recent merge. Does anybody have an idea for how to mechanize fixing these (I doubt you can count on the APPLE LOCAL comment being there)? If there's no better way than slogging through

I have historically noticed that in ZFS, when ever there is a heavy writer to a pool via NFS, the reads can held back (basically paused). An example is a RAID10 pool of 6 disks, whereby a directory of files including some large 100+MB in size being written can cause other clients over NFS to pause for seconds (5-30 or so). This on B70 bits. I''ve gotten used to this behavior over NFS, but

Due to recent experiences, and discussion on this list, my colleague and I performed some tests: Using solaris 10, fully upgraded. (zpool 15 is latest, which does not have log device removal that was introduced in zpool 19) In any way possible, you lose an unmirrored log device, and the OS will crash, and the whole zpool is permanently gone, even after reboots. Using opensolaris,