On 8/31/2012 1:44 AM, Stan Hoeppner wrote: > On 8/30/2012 10:15 PM, Andy Chandra wrote: > >> I was wondering if Debian 6.0.5 support TRIM (for Solid-state Disks) using >> XFS filesystem on Debian 6.0.5?
The server specs on your website list two 160GB SSDs in RAID1. TTBOMK no RAID implementation, hardware or software, yet supports passing TRIM commands from the filesystem to the storage. Patches to allow Linux software RAID (mdRAID/mdadm/dmraid) to pass TRIM are being developed. If these SSDs contain one of the latest SandForce controllers, you don't really need TRIM as the DuraClass technology provides most of the same benefits: http://www.sandforce.com/index.php?id=3 Regarding things other than TRIM support I suggest you install irqbalance: https://irqbalance.org/ The Debian package name is the same. This will spread IRQs generated by the SSDs, NICs, and other peripherals across cores in both of your CPU sockets. Normally IRQs are routed to only one socket and a single core within it. Under heavy load SSDs can create a tremendous interrupt load on a CPU/core, typically the boot processor, CPU #0. Also make sure MSI/MSI-X interrupts are enabled if the hardware supports them. If you plan to use Linux software md/RAID (mdadm) to mirror the SSDs, note that the write code is single threaded. This means that under heavy write load you may saturate one CPU core with the md/RAID1 thread as it tends to pin to once core for cache reuse benefits. Yes even a 3.4GHz Xeon core can be saturated if your SSDs are of the newest SATAIII generation, capable of ~80K IOPS and 400-500MB/s write throughput. The single md/RAID1 write thread may thus prevent you from achieving full performance from the SSDs. This obviously depends on your workload. A patch that implements multiple write threads to address this limitation is currently in development. > Not with the default kernel. Read on. > >> Anyone has clue about installing XFS filesystem on Debian 6.0.5? > > The XFS driver will load as a module. To create an XFS filesystem: > > ~$ mkfs.xfs /dev/[device] > ~$ mkfs.xfs /dev/sdb > >> I'm planning for using MySQL (/var) on XFS filesystem on my SSD. > > After creating the XFS you'd mount it at /var. Instructions for > mounting and enabling automatic FITRIM in XFS are found here: > > http://xfs.org/index.php/FITRIM/discard > > The default 6.0.5 kernel is 2.6.32-5 which is very old and does not > support TRIM. As mentioned in the XFS FITRIM FAQ, you'll need at > minimum kernel 2.6.38 for batch mode TRIM and 3.0.0 for realtime TRIM. > > Debian doesn't offer a 2.6.38 kernel, but the backports repository does > offer a 3.2 kernel. The package name is: > > linux-image-3.2.0-0.bpo.3-amd64 > > This kernel allows using either FITRIM mode. For instructions to install > packages from the backports repo see: > > http://backports-master.debian.org/Instructions/ -- Stan -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/504089be.20...@hardwarefreak.com
